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1. De novo TRIM8 variants impair its protein localization to nuclear bodies and cause developmental delay, epilepsy, and focal segmental glomerulosclerosis

Author

Weng, Patricia L., Majmundar, Amar J., Khan, Kamal, Lim, Tze Y., Shril, Shirlee, Jin, Gina, Musgrove, John, Wang, Minxian, Ahram, Dina F., Aggarwal, Vimla S., Bier, Louise E., Heinzen, Erin L., Onuchic-Whitford, Ana C., Mann, Nina, Buerger, Florian, Schneider, Ronen, Deutsch, Konstantin, Kitzler, Thomas M., Klambt, Verena, Kolb, Amy, Mao, Youying, El Achkar, Christelle Moufawad, Mitrotti, Adele, Martino, Jeremiah, Beck, Bodo B., Altmuller, Janine, Benz, Marcus R., Yano, Shoji, Mikati, Mohamad A., Gunduz, Talha, Cope, Heidi, Shashi, Vandana, Trachtman, Howard, Bodria, Monica, Caridi, Gianluca, Pisani, Isabella, Fiaccadori, Enrico, AbuMaziad, Asmaa S., Martinez-Agosto, Julian A., Yadin, Ora, Zuckerman, Jonathan, Kim, Arang, John-Kroegel, Ulrike, Tyndall, Amanda, V, Parboosingh, Jillian S., Innes, A. Micheil, Bierzynska, Agnieszka, Koziell, Ania B., Muorah, Mordi, Saleem, Moin A., Hoefele, Julia, Riedhammer, Korbinian M., Gharavi, Ali G., Jobanputra, Vaidehi, Pierce-Hoffman, Emma, Seaby, Eleanor G., O'Donnell-Luria, Anne, Rehm, Heidi L., Mane, Shrikant, D'Agati, Vivette D., Pollak, Martin R., Ghiggeri, Gian Marco, Lifton, Richard P., Goldstein, David B., Davis, Erica E., Hildebrandt, Friedhelm, Sanna-Cherchi, Simone, Weng, Patricia L., Majmundar, Amar J., Khan, Kamal, Lim, Tze Y., Shril, Shirlee, Jin, Gina, Musgrove, John, Wang, Minxian, Ahram, Dina F., Aggarwal, Vimla S., Bier, Louise E., Heinzen, Erin L., Onuchic-Whitford, Ana C., Mann, Nina, Buerger, Florian, Schneider, Ronen, Deutsch, Konstantin, Kitzler, Thomas M., Klambt, Verena, Kolb, Amy, Mao, Youying, El Achkar, Christelle Moufawad, Mitrotti, Adele, Martino, Jeremiah, Beck, Bodo B., Altmuller, Janine, Benz, Marcus R., Yano, Shoji, Mikati, Mohamad A., Gunduz, Talha, Cope, Heidi, Shashi, Vandana, Trachtman, Howard, Bodria, Monica, Caridi, Gianluca, Pisani, Isabella, Fiaccadori, Enrico, AbuMaziad, Asmaa S., Martinez-Agosto, Julian A., Yadin, Ora, Zuckerman, Jonathan, Kim, Arang, John-Kroegel, Ulrike, Tyndall, Amanda, V, Parboosingh, Jillian S., Innes, A. Micheil, Bierzynska, Agnieszka, Koziell, Ania B., Muorah, Mordi, Saleem, Moin A., Hoefele, Julia, Riedhammer, Korbinian M., Gharavi, Ali G., Jobanputra, Vaidehi, Pierce-Hoffman, Emma, Seaby, Eleanor G., O'Donnell-Luria, Anne, Rehm, Heidi L., Mane, Shrikant, D'Agati, Vivette D., Pollak, Martin R., Ghiggeri, Gian Marco, Lifton, Richard P., Goldstein, David B., Davis, Erica E., Hildebrandt, Friedhelm, and Sanna-Cherchi, Simone

Abstract

Focal segmental glomerulosclerosis (FSGS) is the main pathology underlying steroid-resistant nephrotic syndrome (SRNS) and a leading cause of chronic kidney disease. Monogenic forms of pediatric SRNS are predominantly caused by recessive mutations, while the contribution of de novo variants (DNVs) to this trait is poorly understood. Using exome sequencing (ES) in a proband with FSGS/SRNS, developmental delay, and epilepsy, we discovered a nonsense DNV in TRIM8, which encodes the E3 ubiquitin ligase tripartite motif containing 8. To establish whether TRIM8 variants represent a cause of FSGS, we aggregated exome/genome-sequencing data for 2,501 pediatric FSGS/SRNS-affected individuals and 48,556 control subjects, detecting eight heterozygous TRIM8 truncating variants in affected subjects but none in control subjects (p = 3.28 3 10(-11)). In all six cases with available parental DNA, we demonstrated de novo inheritance (p = 2.21 3 10(-15)). Reverse phenotyping revealed neurodevelopmental disease in all eight families. We next analyzed ES from 9,067 individuals with epilepsy, yielding three additional families with truncating TRIM8 variants. Clinical review revealed FSGS in all. All TRIM8 variants cause protein truncation clustering within the last exon between residues 390 and 487 of the 551 amino acid protein, indicating a correlation between this syndrome and loss of the TRIM8 C-terminal region. Wild-type TRIM8 overexpressed in immortalized human podocytes and neuronal cells localized to nuclear bodies, while constructs harboring patient-specific variants mislocalized diffusely to the nucleoplasm. Co-localization studies demonstrated that Gemini and Cajal bodies frequently abut a TRIM8 nuclear body. Truncating TRIM8 DNVs cause a neuro-renal syndrome via aberrant TRIM8 localization, implicating nuclear bodies in FSGS and developmental brain disease.

Published
2021

2. De novo TRIM8 variants impair its protein localization to nuclear bodies and cause developmental delay, epilepsy, and focal segmental glomerulosclerosis.

Author

Weng PL, Majmundar AJ, Khan K, Lim TY, Shril S, Jin G, Musgrove J, Wang M, Ahram DF, Aggarwal VS, Bier LE, Heinzen EL, Onuchic-Whitford AC, Mann N, Buerger F, Schneider R, Deutsch K, Kitzler TM, Klämbt V, Kolb A, Mao Y, Moufawad El Achkar C, Mitrotti A, Martino J, Beck BB, Altmüller J, Benz MR, Yano S, Mikati MA, Gunduz T, Cope H, Shashi V, Trachtman H, Bodria M, Caridi G, Pisani I, Fiaccadori E, AbuMaziad AS, Martinez-Agosto JA, Yadin O, Zuckerman J, Kim A, John-Kroegel U, Tyndall AV, Parboosingh JS, Innes AM, Bierzynska A, Koziell AB, Muorah M, Saleem MA, Hoefele J, Riedhammer KM, Gharavi AG, Jobanputra V, Pierce-Hoffman E, Seaby EG, O'Donnell-Luria A, Rehm HL, Mane S, D'Agati VD, Pollak MR, Ghiggeri GM, Lifton RP, Goldstein DB, Davis EE, Hildebrandt F, and Sanna-Cherchi S

Subjects
Adult, Animals, Carrier Proteins chemistry, Carrier Proteins metabolism, Cell Line, Child, Child, Preschool, Codon, Nonsense, Developmental Disabilities metabolism, Epilepsy metabolism, Female, Glomerulosclerosis, Focal Segmental metabolism, Humans, Kidney metabolism, Male, Mice, Mutation, Nerve Tissue Proteins chemistry, Nerve Tissue Proteins metabolism, Phenotype, Podocytes metabolism, Exome Sequencing, Carrier Proteins genetics, Developmental Disabilities genetics, Epilepsy genetics, Glomerulosclerosis, Focal Segmental genetics, Intranuclear Space metabolism, Nephrotic Syndrome genetics, Nephrotic Syndrome metabolism, Nerve Tissue Proteins genetics
Abstract

Focal segmental glomerulosclerosis (FSGS) is the main pathology underlying steroid-resistant nephrotic syndrome (SRNS) and a leading cause of chronic kidney disease. Monogenic forms of pediatric SRNS are predominantly caused by recessive mutations, while the contribution of de novo variants (DNVs) to this trait is poorly understood. Using exome sequencing (ES) in a proband with FSGS/SRNS, developmental delay, and epilepsy, we discovered a nonsense DNV in TRIM8, which encodes the E3 ubiquitin ligase tripartite motif containing 8. To establish whether TRIM8 variants represent a cause of FSGS, we aggregated exome/genome-sequencing data for 2,501 pediatric FSGS/SRNS-affected individuals and 48,556 control subjects, detecting eight heterozygous TRIM8 truncating variants in affected subjects but none in control subjects (p = 3.28 × 10 -11 ). In all six cases with available parental DNA, we demonstrated de novo inheritance (p = 2.21 × 10 -15 ). Reverse phenotyping revealed neurodevelopmental disease in all eight families. We next analyzed ES from 9,067 individuals with epilepsy, yielding three additional families with truncating TRIM8 variants. Clinical review revealed FSGS in all. All TRIM8 variants cause protein truncation clustering within the last exon between residues 390 and 487 of the 551 amino acid protein, indicating a correlation between this syndrome and loss of the TRIM8 C-terminal region. Wild-type TRIM8 overexpressed in immortalized human podocytes and neuronal cells localized to nuclear bodies, while constructs harboring patient-specific variants mislocalized diffusely to the nucleoplasm. Co-localization studies demonstrated that Gemini and Cajal bodies frequently abut a TRIM8 nuclear body. Truncating TRIM8 DNVs cause a neuro-renal syndrome via aberrant TRIM8 localization, implicating nuclear bodies in FSGS and developmental brain disease., (Copyright © 2021 American Society of Human Genetics. Published by Elsevier Inc. All rights reserved.)

Published
2021
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