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1. Molecular Diagnostics of Duchenne/Becker Muscular Dystrophy Patients by Multiplex Ligation-Dependent Probe Amplification Analysis and Direct Sequencing

Author

Todorova A, Guergueltcheva V, Genova J, Mihaylova V, Todorov T, Tchamova T, Georgieva B, Kremensky I, Tournev I, and Mitev V

Subjects
duchenne/becker muscular dystrophy (dmb/bmd), dmd gene, dystrophin, deletions, duplications, point mutations, multiplex ligation-dependent probe amplification (mlpa) analysis, Genetics, QH426-470
Published
2009
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12. Clinical validation of cutoff target ranges in newborn screening of metabolic disorders by tandem mass spectrometry: A worldwide collaborative project

Author

Mchugh, Dm, Cameron, Ca, Abdenur, Je, Abdulrahman, M., Adair, O., Al Nuaimi SA, Åhlman, H., Allen, Jj, Antonozzi, I., Archer, S., Au, S., Auray Blais, C., Baker, M., Bamforth, F., Beckmann, K., Pino, Gb, Berberich, Sl, Binard, R., Boemer, F., Bonham, J., Breen, Nn, Bryant, Sc, Caggana, M., Caldwell, Sg, Camilot, M., Campbell, C., Carducci, C., Cariappa, R., Carlisle, C., Caruso, U., Cassanello, M., Castilla, Am, Ramos, De, Chakraborty, P., Chandrasekar, R., Ramos, Ac, Cheillan, D., Chien, Yh, Childs, Ta, Chrastina, P., Sica, Yc, de Juan JA, Colandre, Me, Espinoza, Vc, Corso, G., Currier, R., Cyr, D., Czuczy, N., D Apolito, O., Davis, T., de Sain Van der Velden MG, Delgado Pecellin, C., Di Gangi IM, Di Stefano CM, Dotsikas, Y., Downing, M., Downs, Sm, Dy, B., Dymerski, M., Rueda, I., Elvers, B., Eaton, R., Eckerd, Bm, El Mougy, F., Eroh, S., Espada, M., Evans, C., Fawbush, S., Fijolek, Kf, Fisher, L., Franzson, L., Frazier, Dm, Garcia, Lr, Bermejo, Ms, Gavrilov, D., Gerace, R., Giordano, G., Irazabal, Yg, Greed, Lc, Grier, R., Grycki, E., Gu, X., Gulamali Majid, F., Hagar, Af, Han, L., Hannon, Wh, Haslip, C., Hassan, Fa, He, M., Hietala, A., Himstedt, L., Hoffman, Gl, Hoffman, W., Hoggatt, P., Hopkins, Pv, Hougaard, Dm, Hughes, K., Hunt, Pr, Hwu, Wl, Hynes, J., Ibarra González, I., Ingham, Ca, Ivanova, M., Jacox, Wb, John, C., Johnson, Jp, Jónsson, Jj, Karg, E., Kasper, D., Klopper, B., Katakouzinos, D., Khneisser, I., Knoll, D., Kobayashi, H., Koneski, R., Kozich, V., Kouapei, R., Kohlmueller, D., Kremensky, I., giancarlo la marca, Lavochkin, M., Lee, Sy, Lehotay, Dc, Lemes, A., Lepage, J., Lesko, B., Lewis, B., Lim, C., Linard, S., Lindner, M., Lloyd Puryear MA, Lorey, F., Loukas, Yl, Luedtke, J., Maffitt, N., Magee, Jf, Manning, A., Manos, S., Marie, S., Hadachi, Sm, Marquardt, G., Martin, Sj, Matern, D., Mayfield Gibson SK, Mayne, P., Mccallister, Td, Mccann, M., Mcclure, J., Mcgill, Jj, Mckeever, Cd, Mcneilly, B., Morrissey, Ma, Moutsatsou, P., Mulcahy, Ea, Nikoloudis, D., Norgaard Pedersen, B., Oglesbee, D., Oltarzewski, M., Ombrone, D., Ojodu, J., Papakonstantinou, V., Reoyo, Sp, Park, Hd, Pasquali, M., Pasquini, E., Patel, P., Pass, Ka, Peterson, C., Pettersen, Rd, Pitt, Jj, Poh, S., Pollak, A., Porter, C., Poston, Pa, Price, Rw, Queijo, C., Quesada, J., Randell, E., Ranieri, E., Raymond, K., Reddic, Je, Reuben, A., Ricciardi, C., Rinaldo, P., Rivera, Jd, Roberts, A., Rocha, H., Roche, G., Greenberg, Cr, Mellado, Jm, Juan Fita MJ, Ruiz, C., Ruoppolo, M., Rutledge, Sl, Ryu, E., Saban, C., Sahai, I., García Blanco MI, Santiago Borrero, P., Schenone, A., Schoos, R., Schweitzer, B., Scott, P., Seashore, Mr, Seeterlin, Ma, Sesser, De, Sevier, Dw, Shone, Sm, Sinclair, G., Skrinska, Va, Stanley, El, Strovel, Et, Jones, Al, Sunny, S., Takats, Z., Tanyalcin, T., Teofoli, F., Thompson, Jr, Tomashitis, K., Domingos, Mt, Torres, J., Torres, R., Tortorelli, S., Turi, S., Turner, K., Tzanakos, N., Valiente, Ag, Vallance, H., Vela Amieva, M., Vilarinho, L., Döbeln, U., Vincent, Mf, Vorster, Bc, Watson, Ms, Webster, D., Weiss, S., Wilcken, B., Wiley, V., Williams, Sk, Willis, Sa, Woontner, M., Wright, K., Yahyaoui, R., Yamaguchi, S., Yssel, M., Zakowicz, W. M., Mchugh, D, Cameron, Ca, Abdenur, Je, Abdulrahman, M, Adair, O, Al Nuaimi, Sa, Åhlman, H, Allen, Jj, Antonozzi, I, Archer, S, Au, S, Auray Blais, C, Baker, M, Bamforth, F, Beckmann, K, Pino, Gb, Berberich, Sl, Binard, R, Boemer, F, Bonham, J, Breen, Nn, Bryant, Sc, Caggana, M, Caldwell, Sg, Camilot, M, Campbell, C, Carducci, C, Cariappa, R, Carlisle, C, Caruso, U, Cassanello, M, Castilla, Am, Ramos, De, Chakraborty, P, Chandrasekar, R, Ramos, Ac, Cheillan, D, Chien, Yh, Childs, Ta, Chrastina, P, Sica, Yc, de Juan, Ja, Colandre, Me, Espinoza, Vc, Corso, G, Currier, R, Cyr, D, Czuczy, N, D'Apolito, O, Davis, T, de Sain Van der Velden, Mg, Delgado Pecellin, C, Di Gangi, Im, Di Stefano, Cm, Dotsikas, Y, Downing, M, Downs, Sm, Dy, B, Dymerski, M, Rueda, I, Elvers, B, Eaton, R, Eckerd, Bm, El Mougy, F, Eroh, S, Espada, M, Evans, C, Fawbush, S, Fijolek, Kf, Fisher, L, Franzson, L, Frazier, Dm, Garcia, Lr, Bermejo, M, Gavrilov, D, Gerace, R, Giordano, G, Irazabal, Yg, Greed, Lc, Grier, R, Grycki, E, Gu, X, Gulamali Majid, F, Hagar, Af, Han, L, Hannon, Wh, Haslip, C, Hassan, Fa, He, M, Hietala, A, Himstedt, L, Hoffman, Gl, Hoffman, W, Hoggatt, P, Hopkins, Pv, Hougaard, Dm, Hughes, K, Hunt, Pr, Hwu, Wl, Hynes, J, Ibarra González, I, Ingham, Ca, Ivanova, M, Jacox, Wb, John, C, Johnson, Jp, Jónsson, Jj, Karg, E, Kasper, D, Klopper, B, Katakouzinos, D, Khneisser, I, Knoll, D, Kobayashi, H, Koneski, R, Kozich, V, Kouapei, R, Kohlmueller, D, Kremensky, I, la Marca, G, Lavochkin, M, Lee, Sy, Lehotay, Dc, Lemes, A, Lepage, J, Lesko, B, Lewis, B, Lim, C, Linard, S, Lindner, M, Lloyd Puryear, Ma, Lorey, F, Loukas, Yl, Luedtke, J, Maffitt, N, Magee, Jf, Manning, A, Manos, S, Marie, S, Hadachi, Sm, Marquardt, G, Martin, Sj, Matern, D, Mayfield Gibson, Sk, Mayne, P, Mccallister, Td, Mccann, M, Mcclure, J, Mcgill, Jj, Mckeever, Cd, Mcneilly, B, Morrissey, Ma, Moutsatsou, P, Mulcahy, Ea, Nikoloudis, D, Norgaard Pedersen, B, Oglesbee, D, Oltarzewski, M, Ombrone, D, Ojodu, J, Papakonstantinou, V, Reoyo, Sp, Park, Hd, Pasquali, M, Pasquini, E, Patel, P, Pass, Ka, Peterson, C, Pettersen, Rd, Pitt, Jj, Poh, S, Pollak, A, Porter, C, Poston, Pa, Price, Rw, Queijo, C, Quesada, J, Randell, E, Ranieri, E, Raymond, K, Reddic, Je, Reuben, A, Ricciardi, C, Rinaldo, P, Rivera, Jd, Roberts, A, Rocha, H, Roche, G, Greenberg, Cr, Mellado, Jm, Juan Fita, Mj, Ruiz, C, Ruoppolo, Margherita, Rutledge, Sl, Ryu, E, Saban, C, Sahai, I, García Blanco, Mi, Santiago Borrero, P, Schenone, A, Schoos, R, Schweitzer, B, Scott, P, Seashore, Mr, Seeterlin, Ma, Sesser, De, Sevier, Dw, Shone, Sm, Sinclair, G, Skrinska, Va, Stanley, El, Strovel, Et, Jones, Al, Sunny, S, Takats, Z, Tanyalcin, T, Teofoli, F, Thompson, Jr, Tomashitis, K, Domingos, Mt, Torres, J, Torres, R, Tortorelli, S, Turi, S, Turner, K, Tzanakos, N, Valiente, Ag, Vallance, H, Vela Amieva, M, Vilarinho, L, von Döbeln, U, Vincent, Mf, Vorster, Bc, Watson, M, Webster, D, Weiss, S, Wilcken, B, Wiley, V, Williams, Sk, Willis, Sa, Woontner, M, Wright, K, Yahyaoui, R, Yamaguchi, S, Yssel, M, and Zakowicz, W. M.

Subjects
Analyte, Percentile, Pediatrics, medicine.medical_specialty, International Cooperation, tandem mass spectrometry, amino acids, newborn screening, inborn errors of metabolism, acylcarnitines, Tandem mass spectrometry, Sensitivity and Specificity, Neonatal Screening, Metabolic Diseases, Reference Values, Carnitine, Range (statistics), Humans, Medicine, Cutoff, Clinical significance, Genetics (clinical), mass spectrometry, Newborn screening, business.industry, Infant, Newborn, Biochemistry, False positive rate, business, Software, metabolic disorders, newborn screening
Abstract

Purpose: To achieve clinical validation of cutoff values for newborn screening by tandem mass 215 spectrometry through a worldwide collaboration. Methods: Cumulative percentiles of amino 216 acids and acylcarnitines in dried blood spots of approximately 30 million normal newborns and 217 10,615 true positive cases are compared to assign clinical significance, which is achieved when 218 the median of a disease range is either >99%ile or

Published
2011

15. Clinical validation of cutoff target ranges in newborn screening of metabolic disorders by tandem mass spectrometry: A worldwide collaborative project

Author

McHugh, D.M.S. Cameron, C.A. Abdenur, J.E. Abdulrahman, M. Adair, O. Al Nuaimi, S.A. Åhlman, H. Allen, J.J. Antonozzi, I. Archer, S. Au, S. Auray-Blais, C. Baker, M. Bamforth, F. Beckmann, K. Pino, G.B. Berberich, S.L. Binard, R. Boemer, F. Bonham, J. Breen, N.N. Bryant, S.C. Caggana, M. Caldwell, S.G. Camilot, M. Campbell, C. Carducci, C. Cariappa, R. Carlisle, C. Caruso, U. Cassanello, M. Castilla, A.M. Ramos, D.E.C. Chakraborty, P. Chandrasekar, R. Ramos, A.C. Cheillan, D. Chien, Y.-H. Childs, T.A. Chrastina, P. Sica, Y.C. Cocho De Juan, J.A. Colandre, M.E. Espinoza, V.C. Corso, G. Currier, R. Cyr, D. Czuczy, N. D'Apolito, O. Davis, T. De Sain-Van Der Velden, M.G. Pecellin, C.D. Di Gangi, I.M. Di Stefano, C.M. Dotsikas, Y. Downing, M. Downs, S.M. Dy, B. Dymerski, M. Rueda, I. Elvers, B. Eaton, R. Eckerd, B.M. El Mougy, F. Eroh, S. Espada, M. Evans, C. Fawbush, S. Fijolek, K.F. Fisher, L. Franzson, L. Frazier, D.M. Garcia, L.R.C. Bermejo, M.S.G.-V. Gavrilov, D. Gerace, R. Giordano, G. Irazabal, Y.G. Greed, L.C. Grier, R. Grycki, E. Gu, X. Gulamali-Majid, F. Hagar, A.F. Han, L. Hannon, W.H. Haslip, C. Hassan, F.A. He, M. Hietala, A. Himstedt, L. Hoffman, G.L. Hoffman, W. Hoggatt, P. Hopkins, P.V. Hougaard, D.M. Hughes, K. Hunt, P.R. Hwu, W.-L. Hynes, J. Ibarra-González, I. Ingham, C.A. Ivanova, M. Jacox, W.B. John, C. Johnson, J.P. Jónsson, J.J. Karg, E. Kasper, D. Klopper, B. Katakouzinos, D. Khneisser, I. Knoll, D. Kobayashi, H. Koneski, R. Kožich, V. Kouapei, R. Kohlmueller, D. Kremensky, I. La Marca, G. Lavochkin, M. Lee, S.-Y. Lehotay, D.C. Lemes, A. Lepage, J. Lesko, B. Lewis, B. Lim, C. Linard, S. Lindner, M. Lloyd-Puryear, M.A. Lorey, F. Loukas, Y.L. Luedtke, J. Maffitt, N. Magee, J.F. Manning, A. Manos, S. Marie, S. Hadachi, S.M. Marquardt, G. Martin, S.J. Matern, D. Gibson, S.K.M. Mayne, P. McCallister, T.D. McCann, M. McClure, J. McGill, J.J. McKeever, C.D. McNeilly, B. Morrissey, M.A. Moutsatsou, P. Mulcahy, E.A. Nikoloudis, D. Norgaard-Pedersen, B. Oglesbee, D. Oltarzewski, M. Ombrone, D. Ojodu, J. Papakonstantinou, V. Reoyo, S.P. Park, H.-D. Pasquali, M. Pasquini, E. Patel, P. Pass, K.A. Peterson, C. Pettersen, R.D. Pitt, J.J. Poh, S. Pollak, A. Porter, C. Poston, P.A. Price, R.W. Queijo, C. Quesada, J. Randell, E. Ranieri, E. Raymond, K. Reddic, J.E. Reuben, A. Ricciardi, C. Rinaldo, P. Rivera, J.D. Roberts, A. Rocha, H. Roche, G. Greenberg, C.R. Mellado, J.M.E. Juan-Fita, M.J. Ruiz, C. Ruoppolo, M. Rutledge, S.L. Ryu, E. Saban, C. Sahai, I. García-Blanco, M.I.S. Santiago-Borrero, P. Schenone, A. Schoos, R. Schweitzer, B. Scott, P. Seashore, M.R. Seeterlin, M.A. Sesser, D.E. Sevier, D.W. Shone, S.M. Sinclair, G. Skrinska, V.A. Stanley, E.L. Strovel, E.T. Jones, A.L.S. Sunny, S. Takats, Z. Tanyalcin, T. Teofoli, F. Thompson, J.R. Tomashitis, K. Domingos, M.T. Torres, J. Torres, R. Tortorelli, S. Turi, S. Turner, K. Tzanakos, N. Valiente, A.G. Vallance, H. Vela-Amieva, M. Vilarinho, L. Von Döbeln, U. Vincent, M.-F. Vorster, B.C. Watson, M.S. Webster, D. Weiss, S. Wilcken, B. Wiley, V. Williams, S.K. Willis, S.A. Woontner, M. Wright, K. Yahyaoui, R. Yamaguchi, S. Yssel, M. Zakowicz, W.M.

Abstract

PURPOSE:: To achieve clinical validation of cutoff values for newborn screening by tandem mass spectrometry through a worldwide collaborative effort. METHODS:: Cumulative percentiles of amino acids and acylcarnitines in dried blood spots of approximately 25-30 million normal newborns and 10,742 deidentified true positive cases are compared to assign clinical significance, which is achieved when the median of a disorder range is, and usually markedly outside, either the 99th or the 1st percentile of the normal population. The cutoff target ranges of analytes and ratios are then defined as the interval between selected percentiles of the two populations. When overlaps occur, adjustments are made to maximize sensitivity and specificity taking all available factors into consideration. RESULTS:: As of December 1, 2010, 130 sites in 45 countries have uploaded a total of 25,114 percentile data points, 565,232 analyte results of true positive cases with 64 conditions, and 5,341 cutoff values. The average rate of submission of true positive cases between December 1, 2008, and December 1, 2010, was 5.1 cases/day. This cumulative evidence generated 91 high and 23 low cutoff target ranges. The overall proportion of cutoff values within the respective target range was 42% (2,269/5,341). CONCLUSION:: An unprecedented level of cooperation and collaboration has allowed the objective definition of cutoff target ranges for 114 markers to be applied to newborn screening of rare metabolic disorders. © 2011 Lippincott Williams & Wilkins.

Published
2011

17. NDRG1 interacts with APO A-I and A-II and is a functional candidate for the HDL-C QTL on 8q24

Author

Hunter, M., Angelicheva, D., Tournev, I., Ingley, E., Chan, D.C., Watts, G.F., Kremensky, I., Kalaydjieva, L., Hunter, M., Angelicheva, D., Tournev, I., Ingley, E., Chan, D.C., Watts, G.F., Kremensky, I., and Kalaydjieva, L.

Abstract

Hereditary Motor and Sensory Neuropathy Lom (HMSNL) is a severe autosomal recessive peripheral neuropathy, the most common form of demyelinating Charcot-Marie-Tooth (CMT) disease in the Roma (Gypsy) population. The mutated gene, N-myc downstream-regulated gene 1 (NDRG1), is widely expressed and has been implicated in a range of processes and pathways. To gain an insight into NDRG1 function we performed yeast two-hybrid screening and identified interacting proteins whose known functions suggest involvement in cellular trafficking. Further analyses, focusing on apolipoproteins A-I and A-II, confirmed their interaction with NDRG1 in mammalian cells and suggest a defect in Schwann cell lipid trafficking as a major pathogenetic mechanism in HMSNL. At the same time, the chromosomal location of NDRG1 coincides with a reported HDL-C QTL in humans and in mice. A putative role of NDRG1 in the general mechanisms of HDL-mediated cholesterol transport was supported by biochemical studies of blood lipids, which revealed an association between the Gypsy founder mutation, R148X, and decreased HDL-C levels.

Published
2005

19. SIMPLE mutation in demyelinating neuropathy and distribution in sciatic nerve

Author

UCL - Cliniques universitaires Saint-Luc, UCL - MD/NOPS - Département de neurologie et de psychiatrie, UCL - (SLuc) Service de neurologie, Bennett, CL, Shirk, AJ, Huynh, HM, Street, VA, Nelis, E., Van Maldergem, L., De Jonghe, P., Jordanova, A., Guergueltcheva, V, Tournev, I, Van den Bergh, Peter, Seeman, P, Mazanec, R, Prochazka, T, Kremensky, I, Haberlova, J, Weiss, MD, Timmerman, V, Bird, TD, Chance, PF, UCL - Cliniques universitaires Saint-Luc, UCL - MD/NOPS - Département de neurologie et de psychiatrie, UCL - (SLuc) Service de neurologie, Bennett, CL, Shirk, AJ, Huynh, HM, Street, VA, Nelis, E., Van Maldergem, L., De Jonghe, P., Jordanova, A., Guergueltcheva, V, Tournev, I, Van den Bergh, Peter, Seeman, P, Mazanec, R, Prochazka, T, Kremensky, I, Haberlova, J, Weiss, MD, Timmerman, V, Bird, TD, and Chance, PF

Abstract

Charcot-Marie-Tooth neuropathy type 1C (CMT1C) is an autosomal dominant demyelinating peripheral neuropathy caused by missense mutations in the small integral membrane protein of lysosome/late endosome (SIMPLE) gene. To investigate the prevalence of SIMPLE mutations, we screened a cohort of 152 probands with various types of demyelinating or axonal and pure motor or sensory inherited neuropathies. SIMPLE mutations were found only in CMT1 patients, including one G112S and one W116G missense mutations. A novel 1741 polymorphism was identified, yet no splicing defect of SIMPLE is likely. Haplotype analysis of STR markers and intragenic SNPs linked to the gene dem-onstrated that families with the same mutation are unlikely to be related. The clustering of the G112S, T115N, and W116G mutations within five amino acids suggests this domain may be critical to peripheral nerve myelination. Elec-trophysiological studies showed that CMT1C patients from six pedigrees (n = 38) had reduced nerve conduction velocities ranging from 7.5 to 27.0m/sec (peroneal). Two patients had temporal dispersion of nerve conduction and irregularity of conduction Slowing, which is unusual for CMT1 patients. We report the expression of SIMPLE in various cell types of the sciatic nerve, including Schwann cells, the affected cell type in CMT1C.

Published
2004

27. Highly variable neural involvement in sphingomyelinase-deficient Niemann-Pick disease caused by an ancestral Gypsy mutation

Author

Mihaylova, V., primary, Hantke, J., additional, Sinigerska, I., additional, Cherninkova, S., additional, Raicheva, M., additional, Bouwer, S., additional, Tincheva, R., additional, Khuyomdziev, D., additional, Bertranpetit, J., additional, Chandler, D., additional, Angelicheva, D., additional, Kremensky, I., additional, Seeman, P., additional, Tournev, I., additional, and Kalaydjieva, L., additional

Published
2006
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28. Mutation screening of BRCA1 exon 11 in Bulgarian breast cancer families

Author

T. Sedloev, S. Christova, Kremensky I, A. Vlahova, A. Mitkova, R. Dodova, A. Jonkov, T. Dikov, and Radka Kaneva

Subjects
Oncology, Cancer Research, medicine.medical_specialty, business.industry, medicine.disease, language.human_language, Exon, Breast cancer, Internal medicine, medicine, language, Mutation screening, Cancer research, Bulgarian, business
Published
2008

32. A linkage study of affective disorders in two Bulgarian Gypsy families

Author

Kaneva, R., primary, Milanova, V., additional, Onchev, G., additional, Stoyanova, V., additional, Chakarova, C. H., additional, Nikolova, A., additional, Hallmayer, J., additional, Belemezova, M., additional, Milenska, T., additional, Kirov, G., additional, Kremensky, I., additional, Kalaydjieva, L., additional, and Jablensky, A., additional

Published
1998
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34. TYPE I GAUCHER DISEASE (GDI) IN THREE SIBLINGS: ENZYME REPLACEMENT TREATMENT (ERT) REQUIRED.

Author

Gucev, Z. S., Tasic, V., Pop-Jordanova, N., Kirovski, I., Stomnaroska, O., Martinova, M., Jancevska, A., Kremensky, I., and Sinigerska, I.

Subjects
GAUCHER'S disease, JUVENILE diseases, SIBLINGS, ANEMIA in children, BONE marrow examination, GENETIC mutation
Abstract

This is a family of three children, born to healthy Macedonian parents after uneventful pregnancies and delivery. The index child was an eight-year-old girl admitted for abdominal discomfort and distension: the spleen was 14cm below the costal margin (BCM), the liver 8cm BCM. No bone pain or pathology was reported. There was mild pancytopaenia (hemoglobin 11.2 gm/L; WBC counts 4.6 x 103, platelets 70 x 103). Liver function tests, renal ultrasound, bone scan, and a chest radiograph were within normal limits. Bone marrow analysis in this child and her two brothers ( 11 and 6.5 years old) revealed Gaucher cells. Both brothers had only mild anaemia, but the older brother had been splenectomized prior to diagnosis of GD1. Enzyme analysis revealed low activity (2.59, 1.62, and 2.55 nmol/h/mg protein, respectively); plasma chitotriosidase levels were also elevated. Genetic testing revealed homozygosity for the N370S/N370S mutation in all three siblings. In the absence of available enzyme replacement treatment (ERT), the girl was splenectomized. Removing an important immune organ (the spleen) introduces further risk for the patients. In addition, this does not solve the bone involvement characteristic for GD. ERT should be introduced for all GD1 patients in Macedonia. [ABSTRACT FROM AUTHOR]

Published
2009

36. Four generations of epilepsy caused by an inherited microdeletion of the SCN1Agene(e–Pub ahead of print)

Author

Suls, A., Velizarova, R., Yordanova, I., Deprez, L., Van Dyck, T., Wauters, J., Guergueltcheva, V., Claes, L.R.F., Kremensky, I., Jordanova, A., and De Jonghe, P.

Abstract

The aim of this study was to determine the genetic defect in a 4-generational family with an epileptic disorder characterized by febrile and afebrile polymorphic seizures and mild to severe mental retardation by means of analyzing the neuronal voltage-gated sodium channel -subunit gene SCN1Afor mutations.

Published
2010
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40. CHEK2 I157T and colorectal cancer in Bulgaria

Author

Konstantinova D, Tanya Kadiyska, Sokolova V, Kaneva R, Mirchev M, Savov A, Aleksandrova A, Nedin D, Kostadinov E, Damyanov D, Kremensky I, and Mitev V

Subjects
Checkpoint Kinase 2, Carrier State, Cell Cycle, Humans, Genes, Tumor Suppressor, Protein Serine-Threonine Kinases, Bulgaria, Colorectal Neoplasms, Polymorphism, Single Nucleotide, DNA Primers, Neoplasm Staging
Abstract

Germline variants of the CHEK2 gene have been shown to act as low-penetrance cancer susceptibility alleles for a wide range of human malignancies. CHEK2 I157T has particularly been linked to colorectal cancer (CRC) risk. We aimed at establishing the population frequency and contribution of this variant to colorectal carcinogenesis in Bulgaria.We have genotyped 802 population controls and 343 CRC patients from Bulgaria for the CHEK2 I157T variant.Heterozygous were 9 of 343 patients (2.62%, odds ratio/OR=1.0, 95% confidence interval/CI = 0.42 - 2.33, p=0.99% and 21 of 802 controls (2.62%). Higher frequencies were found among patients with multiple polyposis (2/40, 5%, p=0.28) and the rarer mucinous histology (1/11, 9.09%, p= 0.26).We conclude that CHEK2 I157T is not relevant for CRC risk in Bulgaria, but studies on a larger scale might help evaluate its possible significance in respect to disease characteristics.

46. Positive association between a polymorphic locus near the LBX1 gene and predisposition of idiopathic scoliosis in Southeastern European population.

Author

Nikolova S, Dikova M, Dikov D, Djerov A, Savov A, Kremensky I, and Loukanov A

Abstract

Idiopathic scoliosis (IS) is a common medical condition in children, characterized by three-dimensional spinal curve and strong evidence of genetic predisposition. The purpose of the present case-control study is to examine the association between the polymorphic variant rs11190870 (T/C), near the LBX1 gene, and IS predisposition in distinct subgroups based on age at onset, family history and gender. A total of 127 IS patients and 254 unrelated controls of Southeastern European descent were recruited. The genotyping was carried out by TaqMan real-time amplification technology. The results were analyzed by the Pearson's Chi-squared Test and the Fisher's Exact Test with a value of p less than 0.05 as statistically significant. The T allele and homozygous TT genotype were associated with a greater incidence of IS. Our results suggest that there is a genetic association with IS in adolescents, familial and non-familial cases, and in females. Larger case-control studies are necessary to examine the genetic factors of IS/AIS etiology in infants, juveniles and males. In conclusion, the molecular genetic identification of diagnostic and prognostic molecular markers would make an early treatment including minimally invasive procedures possible., Competing Interests: The authors have no conflict of interests to disclose. All patients and parents provided informed consent.

Published
2019
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47. LAMA2 Congenital Muscle Dystrophy: A Novel Pathogenic Mutation in Bulgarian Patient.

Author

Dimova I and Kremensky I

Abstract

Congenital muscle dystrophies (CMD) are genetically and clinically heterogeneous hereditary myopathies mainly with autosomal recessive type of inheritance. The most common form worldwide is considered to be merosin-deficient muscle dystrophy type 1A, called MDC1A (due to laminin- α 2 defects as a result of LAMA2 gene mutation), accounting for 30-40% of total cases of CMD. The exact molecular and clinical diagnoses, respectively, are a prerequisite for the most effective treatment; sometimes orphan drugs exist for some rare diseases. One of such drugs is Tarix, which was FDA approved and announced in 2016 for treatment of MDC1A. Here we present a patient diagnosed postmortem as having early-onset LAMA2 -related muscular dystrophy as a result of mutations in LAMA2, identified by Sanger sequencing in his parents: a novel nonsense mutation c.4452T>A in exon 31, identified in the mother, and a known pathogenic nonsense mutation c.2901C>A in exon 21, detected in the father. The truncating nature of both nonsense mutations made the clinical presentation severe and the outcome fatal. Genetic analysis in such cases of muscle dystrophy is of utmost impact, because it makes the correct diagnosis with at least some specific options for treatment, makes the prognosis depending on the severity of mutation discovered, determines reproductive risk, and offers prophylaxis in the family by means of prenatal or preimplantation diagnostics.

Published
2018
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48. Positive Association between TGFB1 Gene and Susceptibility to Idiopathic Scoliosis in Bulgarian Population.

Author

Nikolova S, Dikova M, Dikov D, Djerov A, Savov A, Kremensky I, and Loukanov A

Subjects
Adolescent, Alleles, Bulgaria, Case-Control Studies, Chi-Square Distribution, Child, Child, Preschool, Female, Gene Frequency genetics, Genetic Association Studies, Genetic Predisposition to Disease genetics, Genotype, Humans, Infant, Infant, Newborn, Male, Polymorphism, Single Nucleotide genetics, Scoliosis genetics, Transforming Growth Factor beta1 genetics
Abstract

Idiopathic scoliosis (IS) is a common medical condition beginning in childhood and characterized by strong evidence for a genetic susceptibility to three-dimensional spinal deformity. The primary goal of the current case-control study is to examine the association between the TGFB1 (-509C/T) functional polymorphic variant and genetic predisposition to IS in the Bulgarian population and the genotype-phenotype correlations in distinct case-control subgroups based on age at onset, family history, and gender. A total of 127 patients with primary scoliosis and 254 gender-matched control subjects were recruited. The mean Cobb angle was 53.8 ± 21.2°. Genotyping of cases and controls was performed using the TaqMan real-time amplification technique. The results were processed statistically using Pearson's Chi-squared test and Fisher's exact test with a value of p less than 0.05 as statistically significant. The polymorphic T allele and TT genotype were associated with a greater incidence of IS and can be considered as predisposing factors with a moderate effect on deformity development. The current results suggested that there was a genetic predisposition in early and late onset IS and familial, sporadic, and female cases. Nevertheless, replication studies are needed to reveal the relationship between the TGFB1 locus and certain subtypes of IS in different populations.

Published
2018
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49. A familial case of severe infantile nephronophthisis explained by oligogenic inheritance.

Author

Penchev V, Boueva A, Kamenarova K, Roussinov D, Tzveova R, Ivanova M, Dimitrova V, Kremensky I, Mitev V, Kaneva R, and Beltcheva O

Subjects
Adult, Child, Epistasis, Genetic, Female, Genes, Modifier, Humans, Infant, Newborn, Kidney Diseases, Cystic diagnosis, Male, Mutation, Pedigree, Kidney Diseases, Cystic genetics, Kinesins genetics, Proteins genetics
Abstract

Renal cysts are common malformation during the prenatal and postnatal period and frequent cause of chronic kidney or ESRD. More than 70 genes have been shown to play role in their pathology. Part of them are responsible for the structure and function of the cilia, which assigns a large proportion of the renal cystic diseases in the ciliopathies. Another group of genes responsible for cystic kidneys encodes transcription factors with crucial role during organogenesis. We describe here a systematic approach for identifying the genetic cause(s) of an unusually severe form of renal cystic disease in a family with multiple affected siblings. High throughput mutations screening of the parents and one of the children was applied for identifying the genetic causes of the disease. The affected child was found to have inherited 3 deleterious mutations in two nephronophthisis genes, NPHP3 and NPHP4. The possibility for epistatic interaction of the NPHP mutations as well as the modifying effect of other inherited genetic variants is discussed., (Copyright © 2017 Elsevier Masson SAS. All rights reserved.)

Published
2017
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50. The Slavic NBN Founder Mutation: A Role for Reproductive Fitness?

Author

Seemanova E, Varon R, Vejvalka J, Jarolim P, Seeman P, Chrzanowska KH, Digweed M, Resnick I, Kremensky I, Saar K, Hoffmann K, Dutrannoy V, Karbasiyan M, Ghani M, Barić I, Tekin M, Kovacs P, Krawczak M, Reis A, Sperling K, and Nothnagel M

Subjects
Adult, Cohort Studies, Czech Republic, DNA Damage, DNA Repair, Female, Genetic Carrier Screening, Haplotypes, Humans, Male, Middle Aged, Nijmegen Breakage Syndrome ethnology, Slovakia, Cell Cycle Proteins genetics, Founder Effect, Mutation, Nijmegen Breakage Syndrome genetics, Nuclear Proteins genetics, Reproduction genetics
Abstract

The vast majority of patients with Nijmegen Breakage Syndrome (NBS) are of Slavic origin and carry a deleterious deletion (c.657del5; rs587776650) in the NBN gene on chromosome 8q21. This mutation is essentially confined to Slavic populations and may thus be considered a Slavic founder mutation. Notably, not a single parenthood of a homozygous c.657del5 carrier has been reported to date, while heterozygous carriers do reproduce but have an increased cancer risk. These observations seem to conflict with the considerable carrier frequency of c.657del5 of 0.5% to 1% as observed in different Slavic populations because deleterious mutations would be eliminated quite rapidly by purifying selection. Therefore, we propose that heterozygous c.657del5 carriers have increased reproductive success, i.e., that the mutation confers heterozygote advantage. In fact, in our cohort study of the reproductive history of 24 NBS pedigrees from the Czech Republic, we observed that female carriers gave birth to more children on average than female non-carriers, while no such reproductive differences were observed for males. We also estimate that c.657del5 likely occurred less than 300 generations ago, thus supporting the view that the original mutation predated the historic split and subsequent spread of the 'Slavic people'. We surmise that the higher fertility of female c.657del5 carriers reflects a lower miscarriage rate in these women, thereby reflecting the role of the NBN gene product, nibrin, in the repair of DNA double strand breaks and their processing in immune gene rearrangements, telomere maintenance, and meiotic recombination, akin to the previously described role of the DNA repair genes BRCA1 and BRCA2., Competing Interests: The authors have declared that no competing interests exist.

Published
2016
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