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1. Clinical, biochemical and genetic spectrum of 70 patients with ACAD9 deficiency: is riboflavin supplementation effective?

Author

UCL - SSS/IONS - Institute of NeuroScience, UCL - SSS/IONS/NEUR - Clinical Neuroscience, UCL - (SLuc) Service de neurologie pédiatrique, Repp, Birgit M., Mastantuono, Elisa, Alston, Charlotte L., Schiff, Manuel, Haack, Tobias B., Rötig, Agnes, Ardissone, Anna, Lombès, Anne, Catarino, Claudia B., Diodato, Daria, Schottmann, Gudrun, Poulton, Joanna, Burlina, Alberto, Jonckheere, An, Munnich, Arnold, Rolinski, Boris, Ghezzi, Daniele, Rokicki, Dariusz, Wellesley, Diana, Martinelli, Diego, Wenhong, Ding, Lamantea, Eleonora, Ostergaard, Elsebet, Pronicka, Ewa, Pierre, Germaine, Smeets, Hubert J. M., Wittig, Ilka, Scurr, Ingrid, de Coo, Irenaeus F. M., Moroni, Isabella, Smet, Joél, Mayr, Johannes A., Dai, Lifang, de Meirleir, Linda, Schuelke, Markus, Zeviani, Massimo, Morscher, Raphael J., McFarland, Robert, Seneca, Sara, Klopstock, Thomas, Meitinger, Thomas, Wieland, Thomas, Strom, Tim M., Herberg, Ulrike, Ahting, Uwe, Sperl, Wolfgang, Nassogne, Marie-Cécile, Ling, Han, Fang, Fang, Freisinger, Peter, Van Coster, Rudy, Strecker, Valentina, Taylor, Robert W., Häberle, Johannes, Vockley, Jerry, Prokisch, Holger, Wortmann, Saskia, UCL - SSS/IONS - Institute of NeuroScience, UCL - SSS/IONS/NEUR - Clinical Neuroscience, UCL - (SLuc) Service de neurologie pédiatrique, Repp, Birgit M., Mastantuono, Elisa, Alston, Charlotte L., Schiff, Manuel, Haack, Tobias B., Rötig, Agnes, Ardissone, Anna, Lombès, Anne, Catarino, Claudia B., Diodato, Daria, Schottmann, Gudrun, Poulton, Joanna, Burlina, Alberto, Jonckheere, An, Munnich, Arnold, Rolinski, Boris, Ghezzi, Daniele, Rokicki, Dariusz, Wellesley, Diana, Martinelli, Diego, Wenhong, Ding, Lamantea, Eleonora, Ostergaard, Elsebet, Pronicka, Ewa, Pierre, Germaine, Smeets, Hubert J. M., Wittig, Ilka, Scurr, Ingrid, de Coo, Irenaeus F. M., Moroni, Isabella, Smet, Joél, Mayr, Johannes A., Dai, Lifang, de Meirleir, Linda, Schuelke, Markus, Zeviani, Massimo, Morscher, Raphael J., McFarland, Robert, Seneca, Sara, Klopstock, Thomas, Meitinger, Thomas, Wieland, Thomas, Strom, Tim M., Herberg, Ulrike, Ahting, Uwe, Sperl, Wolfgang, Nassogne, Marie-Cécile, Ling, Han, Fang, Fang, Freisinger, Peter, Van Coster, Rudy, Strecker, Valentina, Taylor, Robert W., Häberle, Johannes, Vockley, Jerry, Prokisch, Holger, and Wortmann, Saskia

Abstract

BACKGROUND: Mitochondrial acyl-CoA dehydrogenase family member 9 (ACAD9) is essential for the assembly of mitochondrial respiratory chain complex I. Disease causing biallelic variants in ACAD9 have been reported in individuals presenting with lactic acidosis and cardiomyopathy. RESULTS: We describe the genetic, clinical and biochemical findings in a cohort of 70 patients, of whom 29 previously unpublished. We found 34 known and 18 previously unreported variants in ACAD9. No patients harbored biallelic loss of function mutations, indicating that this combination is unlikely to be compatible with life. Causal pathogenic variants were distributed throughout the entire gene, and there was no obvious genotype-phenotype correlation. Most of the patients presented in the first year of life. For this subgroup the survival was poor (50% not surviving the first 2 years) comparing to patients with a later presentation (more than 90% surviving 10 years). The most common clinical findings were cardiomyopathy (85%), muscular weakness (75%) and exercise intolerance (72%). Interestingly, severe intellectual deficits were only reported in one patient and severe developmental delays in four patients. More than 70% of the patients were able to perform the same activities of daily living when compared to peers. CONCLUSIONS: Our data show that riboflavin treatment improves complex I activity in the majority of patient-derived fibroblasts tested. This effect was also reported for most of the treated patients and is mirrored in the survival data. In the patient group with disease-onset below 1 year of age, we observed a statistically-significant better survival for patients treated with riboflavin.

Published
2018

2. Clinical, biochemical and genetic spectrum of 70 patients with ACAD9 deficiency: Is riboflavin supplementation effective?

Author

Repp, B, Mastantuono, E, Alston, C, Schiff, M, Haack, T, Rötig, A, Ardissone, A, Lombès, A, Catarino, C, Diodato, D, Schottmann, G, Poulton, J, Burlina, A, Jonckheere, A, Munnich, A, Rolinski, B, Ghezzi, D, Rokicki, D, Wellesley, D, Martinelli, D, Wenhong, D, Lamantea, E, Ostergaard, E, Pronicka, E, Pierre, G, Smeets, H, Wittig, I, Scurr, I, De Coo, I, Moroni, I, Smet, J, Mayr, J, Dai, L, De Meirleir, L, Schuelke, M, Zeviani, M, Morscher, R, Mcfarland, R, Seneca, S, Klopstock, T, Meitinger, T, Wieland, T, Strom, T, Herberg, U, Ahting, U, Sperl, W, Nassogne, M, Ling, H, Fang, F, Freisinger, P, Van Coster, R, Strecker, V, Taylor, R, Häberle, J, Vockley, J, Prokisch, H, Wortmann, S, Repp, Birgit M., Mastantuono, Elisa, Alston, Charlotte L., Schiff, Manuel, Haack, Tobias B., Rötig, Agnes, Ardissone, Anna, Lombès, Anne, Catarino, Claudia B., Diodato, Daria, Schottmann, Gudrun, Poulton, Joanna, Burlina, Alberto, Jonckheere, An, Munnich, Arnold, Rolinski, Boris, Ghezzi, Daniele, Rokicki, Dariusz, Wellesley, Diana, Martinelli, Diego, Wenhong, Ding, Lamantea, Eleonora, Ostergaard, Elsebet, Pronicka, Ewa, Pierre, Germaine, Smeets, Hubert J. M., Wittig, Ilka, Scurr, Ingrid, De Coo, Irenaeus F. M., Moroni, Isabella, Smet, Joél, Mayr, Johannes A., Dai, Lifang, De Meirleir, Linda, Schuelke, Markus, Zeviani, Massimo, Morscher, Raphael J., McFarland, Robert, Seneca, Sara, Klopstock, Thomas, Meitinger, Thomas, Wieland, Thomas, Strom, Tim M., Herberg, Ulrike, Ahting, Uwe, Sperl, Wolfgang, Nassogne, Marie-Cecile, Ling, Han, Fang, Fang, Freisinger, Peter, Van Coster, Rudy, Strecker, Valentina, Taylor, Robert W., Häberle, Johannes, Vockley, Jerry, Prokisch, Holger, Wortmann, Saskia, Repp, B, Mastantuono, E, Alston, C, Schiff, M, Haack, T, Rötig, A, Ardissone, A, Lombès, A, Catarino, C, Diodato, D, Schottmann, G, Poulton, J, Burlina, A, Jonckheere, A, Munnich, A, Rolinski, B, Ghezzi, D, Rokicki, D, Wellesley, D, Martinelli, D, Wenhong, D, Lamantea, E, Ostergaard, E, Pronicka, E, Pierre, G, Smeets, H, Wittig, I, Scurr, I, De Coo, I, Moroni, I, Smet, J, Mayr, J, Dai, L, De Meirleir, L, Schuelke, M, Zeviani, M, Morscher, R, Mcfarland, R, Seneca, S, Klopstock, T, Meitinger, T, Wieland, T, Strom, T, Herberg, U, Ahting, U, Sperl, W, Nassogne, M, Ling, H, Fang, F, Freisinger, P, Van Coster, R, Strecker, V, Taylor, R, Häberle, J, Vockley, J, Prokisch, H, Wortmann, S, Repp, Birgit M., Mastantuono, Elisa, Alston, Charlotte L., Schiff, Manuel, Haack, Tobias B., Rötig, Agnes, Ardissone, Anna, Lombès, Anne, Catarino, Claudia B., Diodato, Daria, Schottmann, Gudrun, Poulton, Joanna, Burlina, Alberto, Jonckheere, An, Munnich, Arnold, Rolinski, Boris, Ghezzi, Daniele, Rokicki, Dariusz, Wellesley, Diana, Martinelli, Diego, Wenhong, Ding, Lamantea, Eleonora, Ostergaard, Elsebet, Pronicka, Ewa, Pierre, Germaine, Smeets, Hubert J. M., Wittig, Ilka, Scurr, Ingrid, De Coo, Irenaeus F. M., Moroni, Isabella, Smet, Joél, Mayr, Johannes A., Dai, Lifang, De Meirleir, Linda, Schuelke, Markus, Zeviani, Massimo, Morscher, Raphael J., McFarland, Robert, Seneca, Sara, Klopstock, Thomas, Meitinger, Thomas, Wieland, Thomas, Strom, Tim M., Herberg, Ulrike, Ahting, Uwe, Sperl, Wolfgang, Nassogne, Marie-Cecile, Ling, Han, Fang, Fang, Freisinger, Peter, Van Coster, Rudy, Strecker, Valentina, Taylor, Robert W., Häberle, Johannes, Vockley, Jerry, Prokisch, Holger, and Wortmann, Saskia

Abstract

Background: Mitochondrial acyl-CoA dehydrogenase family member 9 (ACAD9) is essential for the assembly of mitochondrial respiratory chain complex I. Disease causing biallelic variants in ACAD9 have been reported in individuals presenting with lactic acidosis and cardiomyopathy. Results: We describe the genetic, clinical and biochemical findings in a cohort of 70 patients, of whom 29 previously unpublished. We found 34 known and 18 previously unreported variants in ACAD9. No patients harbored biallelic loss of function mutations, indicating that this combination is unlikely to be compatible with life. Causal pathogenic variants were distributed throughout the entire gene, and there was no obvious genotype-phenotype correlation. Most of the patients presented in the first year of life. For this subgroup the survival was poor (50% not surviving the first 2 years) comparing to patients with a later presentation (more than 90% surviving 10 years). The most common clinical findings were cardiomyopathy (85%), muscular weakness (75%) and exercise intolerance (72%). Interestingly, severe intellectual deficits were only reported in one patient and severe developmental delays in four patients. More than 70% of the patients were able to perform the same activities of daily living when compared to peers. Conclusions: Our data show that riboflavin treatment improves complex I activity in the majority of patient-derived fibroblasts tested. This effect was also reported for most of the treated patients and is mirrored in the survival data. In the patient group with disease-onset below 1 year of age, we observed a statistically-significant better survival for patients treated with riboflavin.

Published
2018

3. Clinical, biochemical and genetic spectrum of 70 patients with ACAD9 deficiency : is riboflavin supplementation effective?

Author

Repp, Birgit M., Mastantuono, Elisa, Alston, Charlotte, Schiff, Manuel, Haack, Tobias, Rötig, Agnes, Ardissone, Anna, Lombès, Anne, Catarino, Claudia B., Diodato, Daria, Schottmann, Gudrun, Poulton, Joanna, Burlina, Alberto, Jonckheere, An, Munnich, Arnold, Rolinski, Boris, Ghezzi, Daniele, Rokicki, Dariusz, Wellesley, Diana, Martinelli, Diego, Wenhong, Ding, Lamantea, Eleonora, Ostergaard, Elsebet, Pronicka, Ewa, Pierre, Germaine, Smeets, Hubert J. M., Wittig, Ilka, Scurr, Ingrid, De Coo, Irenaeus F. M., Moroni, Isabella, Smet, Joél, Mayr, Johannes A., Dai, Lifang, Meirleir, Linda de, Schülke-Gerstenfeld, Markus, Zeviani, Massimo, Morscher, Raphael J., McFarland, Robert, Seneca, Sara, Klopstock, Thomas, Meitinger, Thomas, Wieland, Thomas, Strom, Tim-Matthias, Herberg, Ulrike, Ahting, Uwe, Sperl, Wolfgang, Nassogne, Marie-Cécile, Ling, Han, Fang, Fang, Freisinger, Peter, Coster, Rudy van, Strecker, Valentina, Taylor, Robert W., Häberle, Johannes, Vockley, Jerry, Prokisch, Holger, Wortmann, Saskia, Repp, Birgit M., Mastantuono, Elisa, Alston, Charlotte, Schiff, Manuel, Haack, Tobias, Rötig, Agnes, Ardissone, Anna, Lombès, Anne, Catarino, Claudia B., Diodato, Daria, Schottmann, Gudrun, Poulton, Joanna, Burlina, Alberto, Jonckheere, An, Munnich, Arnold, Rolinski, Boris, Ghezzi, Daniele, Rokicki, Dariusz, Wellesley, Diana, Martinelli, Diego, Wenhong, Ding, Lamantea, Eleonora, Ostergaard, Elsebet, Pronicka, Ewa, Pierre, Germaine, Smeets, Hubert J. M., Wittig, Ilka, Scurr, Ingrid, De Coo, Irenaeus F. M., Moroni, Isabella, Smet, Joél, Mayr, Johannes A., Dai, Lifang, Meirleir, Linda de, Schülke-Gerstenfeld, Markus, Zeviani, Massimo, Morscher, Raphael J., McFarland, Robert, Seneca, Sara, Klopstock, Thomas, Meitinger, Thomas, Wieland, Thomas, Strom, Tim-Matthias, Herberg, Ulrike, Ahting, Uwe, Sperl, Wolfgang, Nassogne, Marie-Cécile, Ling, Han, Fang, Fang, Freisinger, Peter, Coster, Rudy van, Strecker, Valentina, Taylor, Robert W., Häberle, Johannes, Vockley, Jerry, Prokisch, Holger, and Wortmann, Saskia

Abstract

Background: Mitochondrial acyl-CoA dehydrogenase family member 9 (ACAD9) is essential for the assembly of mitochondrial respiratory chain complex I. Disease causing biallelic variants in ACAD9 have been reported in individuals presenting with lactic acidosis and cardiomyopathy. Results: We describe the genetic, clinical and biochemical findings in a cohort of 70 patients, of whom 29 previously unpublished. We found 34 known and 18 previously unreported variants in ACAD9. No patients harbored biallelic loss of function mutations, indicating that this combination is unlikely to be compatible with life. Causal pathogenic variants were distributed throughout the entire gene, and there was no obvious genotype-phenotype correlation. Most of the patients presented in the first year of life. For this subgroup the survival was poor (50% not surviving the first 2 years) comparing to patients with a later presentation (more than 90% surviving 10 years). The most common clinical findings were cardiomyopathy (85%), muscular weakness (75%) and exercise intolerance (72%). Interestingly, severe intellectual deficits were only reported in one patient and severe developmental delays in four patients. More than 70% of the patients were able to perform the same activities of daily living when compared to peers. Conclusions: Our data show that riboflavin treatment improves complex I activity in the majority of patient-derived fibroblasts tested. This effect was also reported for most of the treated patients and is mirrored in the survival data. In the patient group with disease-onset below 1 year of age, we observed a statistically-significant better survival for patients treated with riboflavin.

Published
2018

4. Clinical, biochemical and genetic spectrum of 70 patients with ACAD9 deficiency: Is riboflavin supplementation effective?

Author

Repp, B, Mastantuono, E, Alston, C, Schiff, M, Haack, T, Rötig, A, Ardissone, A, Lombès, A, Catarino, C, Diodato, D, Schottmann, G, Poulton, J, Burlina, A, Jonckheere, A, Munnich, A, Rolinski, B, Ghezzi, D, Rokicki, D, Wellesley, D, Martinelli, D, Wenhong, D, Lamantea, E, Ostergaard, E, Pronicka, E, Pierre, G, Smeets, H, Wittig, I, Scurr, I, De Coo, I, Moroni, I, Smet, J, Mayr, J, Dai, L, De Meirleir, L, Schuelke, M, Zeviani, M, Morscher, R, Mcfarland, R, Seneca, S, Klopstock, T, Meitinger, T, Wieland, T, Strom, T, Herberg, U, Ahting, U, Sperl, W, Nassogne, M, Ling, H, Fang, F, Freisinger, P, Van Coster, R, Strecker, V, Taylor, R, Häberle, J, Vockley, J, Prokisch, H, Wortmann, S, Repp, Birgit M., Mastantuono, Elisa, Alston, Charlotte L., Schiff, Manuel, Haack, Tobias B., Rötig, Agnes, Ardissone, Anna, Lombès, Anne, Catarino, Claudia B., Diodato, Daria, Schottmann, Gudrun, Poulton, Joanna, Burlina, Alberto, Jonckheere, An, Munnich, Arnold, Rolinski, Boris, Ghezzi, Daniele, Rokicki, Dariusz, Wellesley, Diana, Martinelli, Diego, Wenhong, Ding, Lamantea, Eleonora, Ostergaard, Elsebet, Pronicka, Ewa, Pierre, Germaine, Smeets, Hubert J. M., Wittig, Ilka, Scurr, Ingrid, De Coo, Irenaeus F. M., Moroni, Isabella, Smet, Joél, Mayr, Johannes A., Dai, Lifang, De Meirleir, Linda, Schuelke, Markus, Zeviani, Massimo, Morscher, Raphael J., McFarland, Robert, Seneca, Sara, Klopstock, Thomas, Meitinger, Thomas, Wieland, Thomas, Strom, Tim M., Herberg, Ulrike, Ahting, Uwe, Sperl, Wolfgang, Nassogne, Marie-Cecile, Ling, Han, Fang, Fang, Freisinger, Peter, Van Coster, Rudy, Strecker, Valentina, Taylor, Robert W., Häberle, Johannes, Vockley, Jerry, Prokisch, Holger, Wortmann, Saskia, Repp, B, Mastantuono, E, Alston, C, Schiff, M, Haack, T, Rötig, A, Ardissone, A, Lombès, A, Catarino, C, Diodato, D, Schottmann, G, Poulton, J, Burlina, A, Jonckheere, A, Munnich, A, Rolinski, B, Ghezzi, D, Rokicki, D, Wellesley, D, Martinelli, D, Wenhong, D, Lamantea, E, Ostergaard, E, Pronicka, E, Pierre, G, Smeets, H, Wittig, I, Scurr, I, De Coo, I, Moroni, I, Smet, J, Mayr, J, Dai, L, De Meirleir, L, Schuelke, M, Zeviani, M, Morscher, R, Mcfarland, R, Seneca, S, Klopstock, T, Meitinger, T, Wieland, T, Strom, T, Herberg, U, Ahting, U, Sperl, W, Nassogne, M, Ling, H, Fang, F, Freisinger, P, Van Coster, R, Strecker, V, Taylor, R, Häberle, J, Vockley, J, Prokisch, H, Wortmann, S, Repp, Birgit M., Mastantuono, Elisa, Alston, Charlotte L., Schiff, Manuel, Haack, Tobias B., Rötig, Agnes, Ardissone, Anna, Lombès, Anne, Catarino, Claudia B., Diodato, Daria, Schottmann, Gudrun, Poulton, Joanna, Burlina, Alberto, Jonckheere, An, Munnich, Arnold, Rolinski, Boris, Ghezzi, Daniele, Rokicki, Dariusz, Wellesley, Diana, Martinelli, Diego, Wenhong, Ding, Lamantea, Eleonora, Ostergaard, Elsebet, Pronicka, Ewa, Pierre, Germaine, Smeets, Hubert J. M., Wittig, Ilka, Scurr, Ingrid, De Coo, Irenaeus F. M., Moroni, Isabella, Smet, Joél, Mayr, Johannes A., Dai, Lifang, De Meirleir, Linda, Schuelke, Markus, Zeviani, Massimo, Morscher, Raphael J., McFarland, Robert, Seneca, Sara, Klopstock, Thomas, Meitinger, Thomas, Wieland, Thomas, Strom, Tim M., Herberg, Ulrike, Ahting, Uwe, Sperl, Wolfgang, Nassogne, Marie-Cecile, Ling, Han, Fang, Fang, Freisinger, Peter, Van Coster, Rudy, Strecker, Valentina, Taylor, Robert W., Häberle, Johannes, Vockley, Jerry, Prokisch, Holger, and Wortmann, Saskia

Abstract

Background: Mitochondrial acyl-CoA dehydrogenase family member 9 (ACAD9) is essential for the assembly of mitochondrial respiratory chain complex I. Disease causing biallelic variants in ACAD9 have been reported in individuals presenting with lactic acidosis and cardiomyopathy. Results: We describe the genetic, clinical and biochemical findings in a cohort of 70 patients, of whom 29 previously unpublished. We found 34 known and 18 previously unreported variants in ACAD9. No patients harbored biallelic loss of function mutations, indicating that this combination is unlikely to be compatible with life. Causal pathogenic variants were distributed throughout the entire gene, and there was no obvious genotype-phenotype correlation. Most of the patients presented in the first year of life. For this subgroup the survival was poor (50% not surviving the first 2 years) comparing to patients with a later presentation (more than 90% surviving 10 years). The most common clinical findings were cardiomyopathy (85%), muscular weakness (75%) and exercise intolerance (72%). Interestingly, severe intellectual deficits were only reported in one patient and severe developmental delays in four patients. More than 70% of the patients were able to perform the same activities of daily living when compared to peers. Conclusions: Our data show that riboflavin treatment improves complex I activity in the majority of patient-derived fibroblasts tested. This effect was also reported for most of the treated patients and is mirrored in the survival data. In the patient group with disease-onset below 1 year of age, we observed a statistically-significant better survival for patients treated with riboflavin.

Published
2018

5. Clinical, biochemical and genetic spectrum of 70 patients with ACAD9 deficiency:is riboflavin supplementation effective?

Author

Repp, Birgit M, Mastantuono, Elisa, Alston, Charlotte L, Schiff, Manuel, Haack, Tobias B, Rötig, Agnes, Ardissone, Anna, Lombès, Anne, Catarino, Claudia B, Diodato, Daria, Schottmann, Gudrun, Poulton, Joanna, Burlina, Alberto, Jonckheere, An, Munnich, Arnold, Rolinski, Boris, Ghezzi, Daniele, Rokicki, Dariusz, Wellesley, Diana, Martinelli, Diego, Wenhong, Ding, Lamantea, Eleonora, Ostergaard, Elsebet, Pronicka, Ewa, Pierre, Germaine, Smeets, Hubert J M, Wittig, Ilka, Scurr, Ingrid, de Coo, Irenaeus F M, Moroni, Isabella, Smet, Joél, Mayr, Johannes A, Dai, Lifang, de Meirleir, Linda, Schuelke, Markus, Zeviani, Massimo, Morscher, Raphael J, McFarland, Robert, Seneca, Sara, Klopstock, Thomas, Meitinger, Thomas, Wieland, Thomas, Strom, Tim M, Herberg, Ulrike, Ahting, Uwe, Sperl, Wolfgang, Nassogne, Marie-Cecile, Ling, Han, Fang, Fang, Freisinger, Peter, Van Coster, Rudy, Strecker, Valentina, Taylor, Robert W, Häberle, Johannes, Vockley, Jerry, Prokisch, Holger, Wortmann, Saskia, Repp, Birgit M, Mastantuono, Elisa, Alston, Charlotte L, Schiff, Manuel, Haack, Tobias B, Rötig, Agnes, Ardissone, Anna, Lombès, Anne, Catarino, Claudia B, Diodato, Daria, Schottmann, Gudrun, Poulton, Joanna, Burlina, Alberto, Jonckheere, An, Munnich, Arnold, Rolinski, Boris, Ghezzi, Daniele, Rokicki, Dariusz, Wellesley, Diana, Martinelli, Diego, Wenhong, Ding, Lamantea, Eleonora, Ostergaard, Elsebet, Pronicka, Ewa, Pierre, Germaine, Smeets, Hubert J M, Wittig, Ilka, Scurr, Ingrid, de Coo, Irenaeus F M, Moroni, Isabella, Smet, Joél, Mayr, Johannes A, Dai, Lifang, de Meirleir, Linda, Schuelke, Markus, Zeviani, Massimo, Morscher, Raphael J, McFarland, Robert, Seneca, Sara, Klopstock, Thomas, Meitinger, Thomas, Wieland, Thomas, Strom, Tim M, Herberg, Ulrike, Ahting, Uwe, Sperl, Wolfgang, Nassogne, Marie-Cecile, Ling, Han, Fang, Fang, Freisinger, Peter, Van Coster, Rudy, Strecker, Valentina, Taylor, Robert W, Häberle, Johannes, Vockley, Jerry, Prokisch, Holger, and Wortmann, Saskia

Abstract

BACKGROUND: Mitochondrial acyl-CoA dehydrogenase family member 9 (ACAD9) is essential for the assembly of mitochondrial respiratory chain complex I. Disease causing biallelic variants in ACAD9 have been reported in individuals presenting with lactic acidosis and cardiomyopathy.RESULTS: We describe the genetic, clinical and biochemical findings in a cohort of 70 patients, of whom 29 previously unpublished. We found 34 known and 18 previously unreported variants in ACAD9. No patients harbored biallelic loss of function mutations, indicating that this combination is unlikely to be compatible with life. Causal pathogenic variants were distributed throughout the entire gene, and there was no obvious genotype-phenotype correlation. Most of the patients presented in the first year of life. For this subgroup the survival was poor (50% not surviving the first 2 years) comparing to patients with a later presentation (more than 90% surviving 10 years). The most common clinical findings were cardiomyopathy (85%), muscular weakness (75%) and exercise intolerance (72%). Interestingly, severe intellectual deficits were only reported in one patient and severe developmental delays in four patients. More than 70% of the patients were able to perform the same activities of daily living when compared to peers.CONCLUSIONS: Our data show that riboflavin treatment improves complex I activity in the majority of patient-derived fibroblasts tested. This effect was also reported for most of the treated patients and is mirrored in the survival data. In the patient group with disease-onset below 1 year of age, we observed a statistically-significant better survival for patients treated with riboflavin.

Published
2018

6. Clinical, biochemical, and genetic features associated with VARS2-related mitochondrial disease

Author

Bruni, F, Di Meo, I, Bellacchio, E, Webb, B, Mcfarland, R, Chrzanowska-Lightowlers, Z, He, L, Skorupa, E, Moroni, I, Ardissone, A, Walczak, A, Tyynismaa, H, Isohanni, P, Mandel, H, Prokisch, H, Haack, T, Bonnen, P, Enrico, B, Pronicka, E, Ghezzi, D, Taylor, R, Diodato, D, Bruni, Francesco, Di Meo, Ivano, Bellacchio, Emanuele, Webb, Bryn D., McFarland, Robert, Chrzanowska-Lightowlers, Zofia M. A., He, Langping, Skorupa, Ewa, Moroni, Isabella, Ardissone, Anna, Walczak, Anna, Tyynismaa, Henna, Isohanni, Pirjo, Mandel, Hanna, Prokisch, Holger, Haack, Tobias, Bonnen, Penelope E., Enrico, Bertini, Pronicka, Ewa, Ghezzi, Daniele, Taylor, Robert W., Diodato, Daria, Bruni, F, Di Meo, I, Bellacchio, E, Webb, B, Mcfarland, R, Chrzanowska-Lightowlers, Z, He, L, Skorupa, E, Moroni, I, Ardissone, A, Walczak, A, Tyynismaa, H, Isohanni, P, Mandel, H, Prokisch, H, Haack, T, Bonnen, P, Enrico, B, Pronicka, E, Ghezzi, D, Taylor, R, Diodato, D, Bruni, Francesco, Di Meo, Ivano, Bellacchio, Emanuele, Webb, Bryn D., McFarland, Robert, Chrzanowska-Lightowlers, Zofia M. A., He, Langping, Skorupa, Ewa, Moroni, Isabella, Ardissone, Anna, Walczak, Anna, Tyynismaa, Henna, Isohanni, Pirjo, Mandel, Hanna, Prokisch, Holger, Haack, Tobias, Bonnen, Penelope E., Enrico, Bertini, Pronicka, Ewa, Ghezzi, Daniele, Taylor, Robert W., and Diodato, Daria

Abstract

In recent years, an increasing number of mitochondrial disorders have been associated with mutations in mitochondrial aminoacyl-tRNA synthetases (mt-aaRSs), which are key enzymes of mitochondrial protein synthesis. Bi-allelic functional variants in VARS2, encoding the mitochondrial valyl tRNA-synthetase, were first reported in a patient with psychomotor delay and epilepsia partialis continua associated with an oxidative phosphorylation (OXPHOS) Complex I defect, before being described in a patient with a neonatal form of encephalocardiomyopathy. Here we provide a detailed genetic, clinical, and biochemical description of 13 patients, from nine unrelated families, harboring VARS2 mutations. All patients except one, who manifested with a less severe disease course, presented at birth exhibiting severe encephalomyopathy and cardiomyopathy. Features included hypotonia, psychomotor delay, seizures, feeding difficulty, abnormal cranial MRI, and elevated lactate. The biochemical phenotype comprised a combined Complex I and Complex IV OXPHOS defect in muscle, with patient fibroblasts displaying normal OXPHOS activity. Homology modeling supported the pathogenicity of VARS2 missense variants. The detailed description of this cohort further delineates our understanding of the clinical presentation associated with pathogenic VARS2 variants and we recommend that this gene should be considered in early-onset mitochondrial encephalomyopathies or encephalocardiomyopathies.

Published
2018

7. Clinical, biochemical and genetic spectrum of 70 patients with ACAD9 deficiency:is riboflavin supplementation effective?

Author

Repp, Birgit M, Mastantuono, Elisa, Alston, Charlotte L, Schiff, Manuel, Haack, Tobias B, Rötig, Agnes, Ardissone, Anna, Lombès, Anne, Catarino, Claudia B, Diodato, Daria, Schottmann, Gudrun, Poulton, Joanna, Burlina, Alberto, Jonckheere, An, Munnich, Arnold, Rolinski, Boris, Ghezzi, Daniele, Rokicki, Dariusz, Wellesley, Diana, Martinelli, Diego, Wenhong, Ding, Lamantea, Eleonora, Ostergaard, Elsebet, Pronicka, Ewa, Pierre, Germaine, Smeets, Hubert J M, Wittig, Ilka, Scurr, Ingrid, de Coo, Irenaeus F M, Moroni, Isabella, Smet, Joél, Mayr, Johannes A, Dai, Lifang, de Meirleir, Linda, Schuelke, Markus, Zeviani, Massimo, Morscher, Raphael J, McFarland, Robert, Seneca, Sara, Klopstock, Thomas, Meitinger, Thomas, Wieland, Thomas, Strom, Tim M, Herberg, Ulrike, Ahting, Uwe, Sperl, Wolfgang, Nassogne, Marie-Cecile, Ling, Han, Fang, Fang, Freisinger, Peter, Van Coster, Rudy, Strecker, Valentina, Taylor, Robert W, Häberle, Johannes, Vockley, Jerry, Prokisch, Holger, Wortmann, Saskia, Repp, Birgit M, Mastantuono, Elisa, Alston, Charlotte L, Schiff, Manuel, Haack, Tobias B, Rötig, Agnes, Ardissone, Anna, Lombès, Anne, Catarino, Claudia B, Diodato, Daria, Schottmann, Gudrun, Poulton, Joanna, Burlina, Alberto, Jonckheere, An, Munnich, Arnold, Rolinski, Boris, Ghezzi, Daniele, Rokicki, Dariusz, Wellesley, Diana, Martinelli, Diego, Wenhong, Ding, Lamantea, Eleonora, Ostergaard, Elsebet, Pronicka, Ewa, Pierre, Germaine, Smeets, Hubert J M, Wittig, Ilka, Scurr, Ingrid, de Coo, Irenaeus F M, Moroni, Isabella, Smet, Joél, Mayr, Johannes A, Dai, Lifang, de Meirleir, Linda, Schuelke, Markus, Zeviani, Massimo, Morscher, Raphael J, McFarland, Robert, Seneca, Sara, Klopstock, Thomas, Meitinger, Thomas, Wieland, Thomas, Strom, Tim M, Herberg, Ulrike, Ahting, Uwe, Sperl, Wolfgang, Nassogne, Marie-Cecile, Ling, Han, Fang, Fang, Freisinger, Peter, Van Coster, Rudy, Strecker, Valentina, Taylor, Robert W, Häberle, Johannes, Vockley, Jerry, Prokisch, Holger, and Wortmann, Saskia

Abstract

BACKGROUND: Mitochondrial acyl-CoA dehydrogenase family member 9 (ACAD9) is essential for the assembly of mitochondrial respiratory chain complex I. Disease causing biallelic variants in ACAD9 have been reported in individuals presenting with lactic acidosis and cardiomyopathy.RESULTS: We describe the genetic, clinical and biochemical findings in a cohort of 70 patients, of whom 29 previously unpublished. We found 34 known and 18 previously unreported variants in ACAD9. No patients harbored biallelic loss of function mutations, indicating that this combination is unlikely to be compatible with life. Causal pathogenic variants were distributed throughout the entire gene, and there was no obvious genotype-phenotype correlation. Most of the patients presented in the first year of life. For this subgroup the survival was poor (50% not surviving the first 2 years) comparing to patients with a later presentation (more than 90% surviving 10 years). The most common clinical findings were cardiomyopathy (85%), muscular weakness (75%) and exercise intolerance (72%). Interestingly, severe intellectual deficits were only reported in one patient and severe developmental delays in four patients. More than 70% of the patients were able to perform the same activities of daily living when compared to peers.CONCLUSIONS: Our data show that riboflavin treatment improves complex I activity in the majority of patient-derived fibroblasts tested. This effect was also reported for most of the treated patients and is mirrored in the survival data. In the patient group with disease-onset below 1 year of age, we observed a statistically-significant better survival for patients treated with riboflavin.

Published
2018

8. Progressive deafness-dystonia due to SERAC1 mutations : A study of 67 cases

Author

Maas, Roeltje R, Iwanicka-Pronicka, Katarzyna, Kalkan-Ucar, Sema, Alhaddad, Bader, AlSayed, Moeenaldeen, Al-Owain, Mohammed, Al-Zaidan, Hamad I, Balasubramaniam, Shanti, Barić, Ivo, Bubshait, Dalal K, Burlina, Alberto, Christodoulou, John, Chung, Wendy K., Colombo, Roberto, Darin, Niklas, Freisinger, Peter, Garcia Silva, Maria Teresa, Grunewald, Stephanie, Haack, Tobias B., van Hasselt, Peter M, Hikmat, Omar, Hörster, Friederike, Isohanni, Pirjo, Ramzan, Khushnooda, Kovacs-Nagy, Reka, Krumina, Zita, Martin-Hernandez, Elena, Mayr, Johannes A, McClean, Patricia, Meirleir, Linda De, Naess, Karin, Ngu, Lock H, Pajdowska, Magdalena, Rahman, Shamima, Riordan, Gillian, Riley, Lisa, Roeben, Benjamin, Rutsch, Frank, Santer, Rene, Schiff, Manuel, Seders, Martine, Sequeira, Silvia, Sperl, Wolfgang, Staufner, Christian, Synofzik, Matthis, Taylor, Robert W, Trubicka, Joanna, Tsiakas, Konstantinos, Unal, Ozlem, Wassmer, Evangeline, Wedatilake, Yehani, Wolff, Toni, Prokisch, Holger, Morava, Eva, Pronicka, Ewa, Wevers, Ron A., de Brouwer, Arjan P M, Wortmann, Saskia B., Maas, Roeltje R, Iwanicka-Pronicka, Katarzyna, Kalkan-Ucar, Sema, Alhaddad, Bader, AlSayed, Moeenaldeen, Al-Owain, Mohammed, Al-Zaidan, Hamad I, Balasubramaniam, Shanti, Barić, Ivo, Bubshait, Dalal K, Burlina, Alberto, Christodoulou, John, Chung, Wendy K., Colombo, Roberto, Darin, Niklas, Freisinger, Peter, Garcia Silva, Maria Teresa, Grunewald, Stephanie, Haack, Tobias B., van Hasselt, Peter M, Hikmat, Omar, Hörster, Friederike, Isohanni, Pirjo, Ramzan, Khushnooda, Kovacs-Nagy, Reka, Krumina, Zita, Martin-Hernandez, Elena, Mayr, Johannes A, McClean, Patricia, Meirleir, Linda De, Naess, Karin, Ngu, Lock H, Pajdowska, Magdalena, Rahman, Shamima, Riordan, Gillian, Riley, Lisa, Roeben, Benjamin, Rutsch, Frank, Santer, Rene, Schiff, Manuel, Seders, Martine, Sequeira, Silvia, Sperl, Wolfgang, Staufner, Christian, Synofzik, Matthis, Taylor, Robert W, Trubicka, Joanna, Tsiakas, Konstantinos, Unal, Ozlem, Wassmer, Evangeline, Wedatilake, Yehani, Wolff, Toni, Prokisch, Holger, Morava, Eva, Pronicka, Ewa, Wevers, Ron A., de Brouwer, Arjan P M, and Wortmann, Saskia B.

Published
2017

9. Progressive deafness-dystonia due to SERAC1 mutations : A study of 67 cases

Author

Maas, Roeltje R, Iwanicka-Pronicka, Katarzyna, Kalkan-Ucar, Sema, Alhaddad, Bader, AlSayed, Moeenaldeen, Al-Owain, Mohammed, Al-Zaidan, Hamad I, Balasubramaniam, Shanti, Barić, Ivo, Bubshait, Dalal K, Burlina, Alberto, Christodoulou, John, Chung, Wendy K., Colombo, Roberto, Darin, Niklas, Freisinger, Peter, Garcia Silva, Maria Teresa, Grunewald, Stephanie, Haack, Tobias B., van Hasselt, Peter M, Hikmat, Omar, Hörster, Friederike, Isohanni, Pirjo, Ramzan, Khushnooda, Kovacs-Nagy, Reka, Krumina, Zita, Martin-Hernandez, Elena, Mayr, Johannes A, McClean, Patricia, Meirleir, Linda De, Naess, Karin, Ngu, Lock H, Pajdowska, Magdalena, Rahman, Shamima, Riordan, Gillian, Riley, Lisa, Roeben, Benjamin, Rutsch, Frank, Santer, Rene, Schiff, Manuel, Seders, Martine, Sequeira, Silvia, Sperl, Wolfgang, Staufner, Christian, Synofzik, Matthis, Taylor, Robert W, Trubicka, Joanna, Tsiakas, Konstantinos, Unal, Ozlem, Wassmer, Evangeline, Wedatilake, Yehani, Wolff, Toni, Prokisch, Holger, Morava, Eva, Pronicka, Ewa, Wevers, Ron A., de Brouwer, Arjan P M, Wortmann, Saskia B., Maas, Roeltje R, Iwanicka-Pronicka, Katarzyna, Kalkan-Ucar, Sema, Alhaddad, Bader, AlSayed, Moeenaldeen, Al-Owain, Mohammed, Al-Zaidan, Hamad I, Balasubramaniam, Shanti, Barić, Ivo, Bubshait, Dalal K, Burlina, Alberto, Christodoulou, John, Chung, Wendy K., Colombo, Roberto, Darin, Niklas, Freisinger, Peter, Garcia Silva, Maria Teresa, Grunewald, Stephanie, Haack, Tobias B., van Hasselt, Peter M, Hikmat, Omar, Hörster, Friederike, Isohanni, Pirjo, Ramzan, Khushnooda, Kovacs-Nagy, Reka, Krumina, Zita, Martin-Hernandez, Elena, Mayr, Johannes A, McClean, Patricia, Meirleir, Linda De, Naess, Karin, Ngu, Lock H, Pajdowska, Magdalena, Rahman, Shamima, Riordan, Gillian, Riley, Lisa, Roeben, Benjamin, Rutsch, Frank, Santer, Rene, Schiff, Manuel, Seders, Martine, Sequeira, Silvia, Sperl, Wolfgang, Staufner, Christian, Synofzik, Matthis, Taylor, Robert W, Trubicka, Joanna, Tsiakas, Konstantinos, Unal, Ozlem, Wassmer, Evangeline, Wedatilake, Yehani, Wolff, Toni, Prokisch, Holger, Morava, Eva, Pronicka, Ewa, Wevers, Ron A., de Brouwer, Arjan P M, and Wortmann, Saskia B.

Published
2017

10. Progressive deafness-dystonia due to SERAC1 mutations : A study of 67 cases

Author

Maas, Roeltje R, Iwanicka-Pronicka, Katarzyna, Kalkan-Ucar, Sema, Alhaddad, Bader, AlSayed, Moeenaldeen, Al-Owain, Mohammed, Al-Zaidan, Hamad I, Balasubramaniam, Shanti, Barić, Ivo, Bubshait, Dalal K, Burlina, Alberto, Christodoulou, John, Chung, Wendy K., Colombo, Roberto, Darin, Niklas, Freisinger, Peter, Garcia Silva, Maria Teresa, Grunewald, Stephanie, Haack, Tobias B., van Hasselt, Peter M, Hikmat, Omar, Hörster, Friederike, Isohanni, Pirjo, Ramzan, Khushnooda, Kovacs-Nagy, Reka, Krumina, Zita, Martin-Hernandez, Elena, Mayr, Johannes A, McClean, Patricia, Meirleir, Linda De, Naess, Karin, Ngu, Lock H, Pajdowska, Magdalena, Rahman, Shamima, Riordan, Gillian, Riley, Lisa, Roeben, Benjamin, Rutsch, Frank, Santer, Rene, Schiff, Manuel, Seders, Martine, Sequeira, Silvia, Sperl, Wolfgang, Staufner, Christian, Synofzik, Matthis, Taylor, Robert W, Trubicka, Joanna, Tsiakas, Konstantinos, Unal, Ozlem, Wassmer, Evangeline, Wedatilake, Yehani, Wolff, Toni, Prokisch, Holger, Morava, Eva, Pronicka, Ewa, Wevers, Ron A., de Brouwer, Arjan P M, Wortmann, Saskia B., Maas, Roeltje R, Iwanicka-Pronicka, Katarzyna, Kalkan-Ucar, Sema, Alhaddad, Bader, AlSayed, Moeenaldeen, Al-Owain, Mohammed, Al-Zaidan, Hamad I, Balasubramaniam, Shanti, Barić, Ivo, Bubshait, Dalal K, Burlina, Alberto, Christodoulou, John, Chung, Wendy K., Colombo, Roberto, Darin, Niklas, Freisinger, Peter, Garcia Silva, Maria Teresa, Grunewald, Stephanie, Haack, Tobias B., van Hasselt, Peter M, Hikmat, Omar, Hörster, Friederike, Isohanni, Pirjo, Ramzan, Khushnooda, Kovacs-Nagy, Reka, Krumina, Zita, Martin-Hernandez, Elena, Mayr, Johannes A, McClean, Patricia, Meirleir, Linda De, Naess, Karin, Ngu, Lock H, Pajdowska, Magdalena, Rahman, Shamima, Riordan, Gillian, Riley, Lisa, Roeben, Benjamin, Rutsch, Frank, Santer, Rene, Schiff, Manuel, Seders, Martine, Sequeira, Silvia, Sperl, Wolfgang, Staufner, Christian, Synofzik, Matthis, Taylor, Robert W, Trubicka, Joanna, Tsiakas, Konstantinos, Unal, Ozlem, Wassmer, Evangeline, Wedatilake, Yehani, Wolff, Toni, Prokisch, Holger, Morava, Eva, Pronicka, Ewa, Wevers, Ron A., de Brouwer, Arjan P M, and Wortmann, Saskia B.

Published
2017

11. Progressive deafness-dystonia due to SERAC1 mutations: A study of 67 cases

Author

Cluster C, Metabole ziekten patientenzorg, Child Health, Maas, Roeltje R, Iwanicka-Pronicka, Katarzyna, Kalkan-Ucar, Sema, Alhaddad, Bader, AlSayed, Moeenaldeen, Al-Owain, Mohammed, Al-Zaidan, Hamad I, Balasubramaniam, Shanti, Barić, Ivo, Bubshait, Dalal K, Burlina, Alberto, Christodoulou, John, Chung, Wendy K., Colombo, Roberto, Darin, Niklas, Freisinger, Peter, Garcia Silva, Maria Teresa, Grunewald, Stephanie, Haack, Tobias B., van Hasselt, Peter M, Hikmat, Omar, Hörster, Friederike, Isohanni, Pirjo, Ramzan, Khushnooda, Kovacs-Nagy, Reka, Krumina, Zita, Martin-Hernandez, Elena, Mayr, Johannes A, McClean, Patricia, Meirleir, Linda De, Naess, Karin, Ngu, Lock H, Pajdowska, Magdalena, Rahman, Shamima, Riordan, Gillian, Riley, Lisa, Roeben, Benjamin, Rutsch, Frank, Santer, Rene, Schiff, Manuel, Seders, Martine, Sequeira, Silvia, Sperl, Wolfgang, Staufner, Christian, Synofzik, Matthis, Taylor, Robert W, Trubicka, Joanna, Tsiakas, Konstantinos, Unal, Ozlem, Wassmer, Evangeline, Wedatilake, Yehani, Wolff, Toni, Prokisch, Holger, Morava, Eva, Pronicka, Ewa, Wevers, Ron A., de Brouwer, Arjan P M, Wortmann, Saskia B., Cluster C, Metabole ziekten patientenzorg, Child Health, Maas, Roeltje R, Iwanicka-Pronicka, Katarzyna, Kalkan-Ucar, Sema, Alhaddad, Bader, AlSayed, Moeenaldeen, Al-Owain, Mohammed, Al-Zaidan, Hamad I, Balasubramaniam, Shanti, Barić, Ivo, Bubshait, Dalal K, Burlina, Alberto, Christodoulou, John, Chung, Wendy K., Colombo, Roberto, Darin, Niklas, Freisinger, Peter, Garcia Silva, Maria Teresa, Grunewald, Stephanie, Haack, Tobias B., van Hasselt, Peter M, Hikmat, Omar, Hörster, Friederike, Isohanni, Pirjo, Ramzan, Khushnooda, Kovacs-Nagy, Reka, Krumina, Zita, Martin-Hernandez, Elena, Mayr, Johannes A, McClean, Patricia, Meirleir, Linda De, Naess, Karin, Ngu, Lock H, Pajdowska, Magdalena, Rahman, Shamima, Riordan, Gillian, Riley, Lisa, Roeben, Benjamin, Rutsch, Frank, Santer, Rene, Schiff, Manuel, Seders, Martine, Sequeira, Silvia, Sperl, Wolfgang, Staufner, Christian, Synofzik, Matthis, Taylor, Robert W, Trubicka, Joanna, Tsiakas, Konstantinos, Unal, Ozlem, Wassmer, Evangeline, Wedatilake, Yehani, Wolff, Toni, Prokisch, Holger, Morava, Eva, Pronicka, Ewa, Wevers, Ron A., de Brouwer, Arjan P M, and Wortmann, Saskia B.

Published
2017

12. Biallelic mutations in TMEM126B cause severe complex i deficiency with a variable clinical phenotype

Author

Alston, Charlotte, Compton, Alison G., Formosa, Luke E., Strecker, Valentina, Oláhová, Monika, Haack, Tobias, Smet, Joél, Stouffs, Katrien, Diakumis, Peter, Ciara, Elżbieta, Cassiman, David, Romain, Nadine, Yarham, John W., He, Langping, De Paepe, Boel, Vanlander, Arnaud V., Seneca, Sara, Feichtinger, René G., Płoski, Rafał, Rokicki, Dariusz, Pronicka, Ewa, Haller, Ronald G., Hove, Johan L. K. van, Bahlo, Melanie, Mayr, Johannes A., Coster, Rudy van, Prokisch, Holger, Wittig, Ilka, Ryan, Michael T., Thorburn, David R., Taylor, Robert W., Alston, Charlotte, Compton, Alison G., Formosa, Luke E., Strecker, Valentina, Oláhová, Monika, Haack, Tobias, Smet, Joél, Stouffs, Katrien, Diakumis, Peter, Ciara, Elżbieta, Cassiman, David, Romain, Nadine, Yarham, John W., He, Langping, De Paepe, Boel, Vanlander, Arnaud V., Seneca, Sara, Feichtinger, René G., Płoski, Rafał, Rokicki, Dariusz, Pronicka, Ewa, Haller, Ronald G., Hove, Johan L. K. van, Bahlo, Melanie, Mayr, Johannes A., Coster, Rudy van, Prokisch, Holger, Wittig, Ilka, Ryan, Michael T., Thorburn, David R., and Taylor, Robert W.

Abstract

Complex I deficiency is the most common biochemical phenotype observed in individuals with mitochondrial disease. With 44 structural subunits and over 10 assembly factors, it is unsurprising that complex I deficiency is associated with clinical and genetic heterogeneity. Massively parallel sequencing (MPS) technologies including custom, targeted gene panels or unbiased whole-exome sequencing (WES) are hugely powerful in identifying the underlying genetic defect in a clinical diagnostic setting, yet many individuals remain without a genetic diagnosis. These individuals might harbor mutations in poorly understood or uncharacterized genes, and their diagnosis relies upon characterization of these orphan genes. Complexome profiling recently identified TMEM126B as a component of the mitochondrial complex I assembly complex alongside proteins ACAD9, ECSIT, NDUFAF1, and TIMMDC1. Here, we describe the clinical, biochemical, and molecular findings in six cases of mitochondrial disease from four unrelated families affected by biallelic (c.635G>T [p.Gly212Val] and/or c.401delA [p.Asn134Ilefs∗2]) TMEM126B variants. We provide functional evidence to support the pathogenicity of these TMEM126B variants, including evidence of founder effects for both variants, and establish defects within this gene as a cause of complex I deficiency in association with either pure myopathy in adulthood or, in one individual, a severe multisystem presentation (chronic renal failure and cardiomyopathy) in infancy. Functional experimentation including viral rescue and complexome profiling of subject cell lines has confirmed TMEM126B as the tenth complex I assembly factor associated with human disease and validates the importance of both genome-wide sequencing and proteomic approaches in characterizing disease-associated genes whose physiological roles have been previously undetermined.

Published
2017

13. A scoring system predicting the clinical course of CLPB defect based on the foetal and neonatal presentation of 31 patients

Author

Pronicka, Ewa, Ropacka-Lesiak, Mariola, Trubicka, Joanna, Pajdowska, Magdalena, Linke, Markus, Ostergaard, Elsebet, Saunders, Carol, Horsch, Sandra, van Karnebeek, Clara, Yaplito-Lee, Joy, Distelmaier, Felix, Õunap, Katrin, Rahman, Shamima, Castelle, Martin, Kelleher, John, Baris, Safa, Iwanicka-Pronicka, Katarzyna, Steward, Colin G, Ciara, Elżbieta, Wortmann, Saskia B, Pronicka, Ewa, Ropacka-Lesiak, Mariola, Trubicka, Joanna, Pajdowska, Magdalena, Linke, Markus, Ostergaard, Elsebet, Saunders, Carol, Horsch, Sandra, van Karnebeek, Clara, Yaplito-Lee, Joy, Distelmaier, Felix, Õunap, Katrin, Rahman, Shamima, Castelle, Martin, Kelleher, John, Baris, Safa, Iwanicka-Pronicka, Katarzyna, Steward, Colin G, Ciara, Elżbieta, and Wortmann, Saskia B

Abstract

Recently, CLPB deficiency has been shown to cause a genetic syndrome with cataracts, neutropenia, and 3-methylglutaconic aciduria. Surprisingly, the neurological presentation ranges from completely unaffected to patients with virtual absence of development. Muscular hypo- and hypertonia, movement disorder and progressive brain atrophy are frequently reported. We present the foetal, peri- and neonatal features of 31 patients, of which five are previously unreported, using a newly developed clinical severity scoring system rating the clinical, metabolic, imaging and other findings weighted by the age of onset. Our data are illustrated by foetal and neonatal videos. The patients were classified as having a mild (n = 4), moderate (n = 13) or severe (n = 14) disease phenotype. The most striking feature of the severe subtype was the neonatal absence of voluntary movements in combination with ventilator dependency and hyperexcitability. The foetal and neonatal presentation mirrored the course of disease with respect to survival (current median age 17.5 years in the mild group, median age of death 35 days in the severe group), severity and age of onset of all findings evaluated. CLPB deficiency should be considered in neonates with absence of voluntary movements, respiratory insufficiency and swallowing problems, especially if associated with 3-methylglutaconic aciduria, neutropenia and cataracts. Being an important differential diagnosis of hyperekplexia (exaggerated startle responses), we advise performing urinary organic acid analysis, blood cell counts and ophthalmological examination in these patients. The neonatal presentation of CLPB deficiency predicts the course of disease in later life, which is extremely important for counselling.

Published
2017

14. Progressive deafness-dystonia due to SERAC1 mutations: A study of 67 cases

Author

Maas, Roeltje R., Iwanicka-Pronicka, Katarzyna, Kalkan Ucar, Sema, Alhaddad, Bader, Alsayed, Moeenaldeen, Al-Owain, Mohammed A., Al-Zaidan, Hamad I., Balasubramaniam, Shanti, Barić, Ivo, Bubshait, Dalal K., Burlina, Alberto, Christodoulou, John, Chung, Wendy K., Colombo, Roberto, Darin, Nikla, Freisinger, Peter, Garcia Silva, Maria Teresa, Grunewald, Stephanie, Haack, Tobias B., van Hasselt, Peter M., Hikmat, Omar, Hörster, Friederike, Isohanni, Pirjo, Ramzan, Khushnooda, Kovacs-Nagy, Reka, Krumina, Zita, Martin-Hernandez, Elena, Mayr, Johannes A., Mcclean, Patricia, De Meirleir, Linda, Naess, Karin, Ngu, Lock H., Pajdowska, Magdalena, Rahman, Shamima, Riordan, Gillian, Riley, Lisa, Roeben, Benjamin, Rutsch, Frank, Santer, Rene, Schiff, Manuel, Seders, Martine, Sequeira, Silvia, Sperl, Wolfgang, Staufner, Christian, Synofzik, Matthi, Taylor, Robert W., Trubicka, Joanna, Tsiakas, Konstantino, Unal, Ozlem, Wassmer, Evangeline, Wedatilake, Yehani, Wolff, Toni, Prokisch, Holger, Morava, Eva, Pronicka, Ewa, Wevers, Ron A., de Brouwer, Arjan P., Wortmann, Saskia B., Colombo, Roberto (ORCID:0000-0003-0482-7542), Maas, Roeltje R., Iwanicka-Pronicka, Katarzyna, Kalkan Ucar, Sema, Alhaddad, Bader, Alsayed, Moeenaldeen, Al-Owain, Mohammed A., Al-Zaidan, Hamad I., Balasubramaniam, Shanti, Barić, Ivo, Bubshait, Dalal K., Burlina, Alberto, Christodoulou, John, Chung, Wendy K., Colombo, Roberto, Darin, Nikla, Freisinger, Peter, Garcia Silva, Maria Teresa, Grunewald, Stephanie, Haack, Tobias B., van Hasselt, Peter M., Hikmat, Omar, Hörster, Friederike, Isohanni, Pirjo, Ramzan, Khushnooda, Kovacs-Nagy, Reka, Krumina, Zita, Martin-Hernandez, Elena, Mayr, Johannes A., Mcclean, Patricia, De Meirleir, Linda, Naess, Karin, Ngu, Lock H., Pajdowska, Magdalena, Rahman, Shamima, Riordan, Gillian, Riley, Lisa, Roeben, Benjamin, Rutsch, Frank, Santer, Rene, Schiff, Manuel, Seders, Martine, Sequeira, Silvia, Sperl, Wolfgang, Staufner, Christian, Synofzik, Matthi, Taylor, Robert W., Trubicka, Joanna, Tsiakas, Konstantino, Unal, Ozlem, Wassmer, Evangeline, Wedatilake, Yehani, Wolff, Toni, Prokisch, Holger, Morava, Eva, Pronicka, Ewa, Wevers, Ron A., de Brouwer, Arjan P., Wortmann, Saskia B., and Colombo, Roberto (ORCID:0000-0003-0482-7542)

Abstract

Objective: 3-Methylglutaconic aciduria, dystonia–deafness, hepatopathy, encephalopathy, Leigh-like syndrome (MEGDHEL) syndrome is caused by biallelic variants in SERAC1. Methods: This multicenter study addressed the course of disease for each organ system. Metabolic, neuroradiological, and genetic findings are reported. Results: Sixty-seven individuals (39 previously unreported) from 59 families were included (age range = 5 days–33.4 years, median age = 9 years). A total of 41 different SERAC1 variants were identified, including 20 that have not been reported before. With the exception of 2 families with a milder phenotype, all affected individuals showed a strikingly homogeneous phenotype and time course. Severe, reversible neonatal liver dysfunction and hypoglycemia were seen in >40% of all cases. Starting at a median age of 6 months, muscular hypotonia (91%) was seen, followed by progressive spasticity (82%, median onset = 15 months) and dystonia (82%, 18 months). The majority of affected individuals never learned to walk (68%). Seventy-nine percent suffered hearing loss, 58% never learned to speak, and nearly all had significant intellectual disability (88%). Magnetic resonance imaging features were accordingly homogenous, with bilateral basal ganglia involvement (98%); the characteristic “putaminal eye” was seen in 53%. The urinary marker 3-methylglutaconic aciduria was present in virtually all patients (98%). Supportive treatment focused on spasticity and drooling, and was effective in the individuals treated; hearing aids or cochlear implants did not improve communication skills. Interpretation: MEGDHEL syndrome is a progressive deafness–dystonia syndrome with frequent and reversible neonatal liver involvement and a strikingly homogenous course of disease. Ann Neurol 2017;82:1004–1015.

Published
2017

15. A scoring system predicting the clinical course of CLPB defect based on the foetal and neonatal presentation of 31 patients

Author

Pronicka, Ewa, Ropacka-Lesiak, Mariola, Trubicka, Joanna, Pajdowska, Magdalena, Linke, Markus, Ostergaard, Elsebet, Saunders, Carol, Horsch, Sandra, van Karnebeek, Clara, Yaplito-Lee, Joy, Distelmaier, Felix, Õunap, Katrin, Rahman, Shamima, Castelle, Martin, Kelleher, John, Baris, Safa, Iwanicka-Pronicka, Katarzyna, Steward, Colin G, Ciara, Elżbieta, Wortmann, Saskia B, Pronicka, Ewa, Ropacka-Lesiak, Mariola, Trubicka, Joanna, Pajdowska, Magdalena, Linke, Markus, Ostergaard, Elsebet, Saunders, Carol, Horsch, Sandra, van Karnebeek, Clara, Yaplito-Lee, Joy, Distelmaier, Felix, Õunap, Katrin, Rahman, Shamima, Castelle, Martin, Kelleher, John, Baris, Safa, Iwanicka-Pronicka, Katarzyna, Steward, Colin G, Ciara, Elżbieta, and Wortmann, Saskia B

Abstract

Recently, CLPB deficiency has been shown to cause a genetic syndrome with cataracts, neutropenia, and 3-methylglutaconic aciduria. Surprisingly, the neurological presentation ranges from completely unaffected to patients with virtual absence of development. Muscular hypo- and hypertonia, movement disorder and progressive brain atrophy are frequently reported. We present the foetal, peri- and neonatal features of 31 patients, of which five are previously unreported, using a newly developed clinical severity scoring system rating the clinical, metabolic, imaging and other findings weighted by the age of onset. Our data are illustrated by foetal and neonatal videos. The patients were classified as having a mild (n = 4), moderate (n = 13) or severe (n = 14) disease phenotype. The most striking feature of the severe subtype was the neonatal absence of voluntary movements in combination with ventilator dependency and hyperexcitability. The foetal and neonatal presentation mirrored the course of disease with respect to survival (current median age 17.5 years in the mild group, median age of death 35 days in the severe group), severity and age of onset of all findings evaluated. CLPB deficiency should be considered in neonates with absence of voluntary movements, respiratory insufficiency and swallowing problems, especially if associated with 3-methylglutaconic aciduria, neutropenia and cataracts. Being an important differential diagnosis of hyperekplexia (exaggerated startle responses), we advise performing urinary organic acid analysis, blood cell counts and ophthalmological examination in these patients. The neonatal presentation of CLPB deficiency predicts the course of disease in later life, which is extremely important for counselling.

Published
2017

16. A Survey of the Newborn Populations in Belgium, Germany, Poland, Czech Republic, Hungary, Bulgaria, Spain, Turkey and Japan for the G985 Variant Allele with Haplotype Analysis at the Medium Chain Acyl-CoA Dehydrogenase Gene. Locus: Clinical and Evol.Con.

Author

Tanaka, Kay, Gregersen, Niels, Ribes, Antonia, Kim, Julie, Kølvraa, Steen, Winter, Vibeke S., Eiberg, Hans Rudolf Lytchoff, Martinez, Gemma, Deufel, Thomas, Leifert, Barbara, Santer, Rene, Francois, Baudouin, Pronicka, Ewa, Laszlo, Aranka, Kmoch, Stanislav, Kremensky, Ivo, Kalaydjicva, Luba, Ozalp, Imran, Ito, Michinori, Tanaka, Kay, Gregersen, Niels, Ribes, Antonia, Kim, Julie, Kølvraa, Steen, Winter, Vibeke S., Eiberg, Hans Rudolf Lytchoff, Martinez, Gemma, Deufel, Thomas, Leifert, Barbara, Santer, Rene, Francois, Baudouin, Pronicka, Ewa, Laszlo, Aranka, Kmoch, Stanislav, Kremensky, Ivo, Kalaydjicva, Luba, Ozalp, Imran, and Ito, Michinori

Published
1997

17. A Survey of the Newborn Populations in Belgium, Germany, Poland, Czech Republic, Hungary, Bulgaria, Spain, Turkey and Japan for the G985 Variant Allele with Haplotype Analysis at the Medium Chain Acyl-CoA Dehydrogenase Gene. Locus: Clinical and Evol.Con.

Author

Tanaka, Kay, Gregersen, Niels, Ribes, Antonia, Kim, Julie, Kølvraa, Steen, Winter, Vibeke S., Eiberg, Hans Rudolf Lytchoff, Martinez, Gemma, Deufel, Thomas, Leifert, Barbara, Santer, Rene, Francois, Baudouin, Pronicka, Ewa, Laszlo, Aranka, Kmoch, Stanislav, Kremensky, Ivo, Kalaydjicva, Luba, Ozalp, Imran, Ito, Michinori, Tanaka, Kay, Gregersen, Niels, Ribes, Antonia, Kim, Julie, Kølvraa, Steen, Winter, Vibeke S., Eiberg, Hans Rudolf Lytchoff, Martinez, Gemma, Deufel, Thomas, Leifert, Barbara, Santer, Rene, Francois, Baudouin, Pronicka, Ewa, Laszlo, Aranka, Kmoch, Stanislav, Kremensky, Ivo, Kalaydjicva, Luba, Ozalp, Imran, and Ito, Michinori

Published
1997

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