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Soloveva EV, Skleimova MM, Minaycheva LI, Garaeva AF, Zhigalina DI, Churkin EO, Okkel YV, Timofeeva OS, Petrov IA, Seitova GN, Lebedev IN, Stepanov VA. PGT-M for spinocerebellar ataxia type 1: development of a STR panel and a report of two clinical cases. J Assist Reprod Genet 2024; 41:1273-1283. [PMID: 38578603 PMCID: PMC11143087 DOI: 10.1007/s10815-024-03105-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2024] [Accepted: 03/20/2024] [Indexed: 04/06/2024] Open
Abstract
PURPOSE To present the developed preimplantation genetic testing (PGT) for spinocerebellar ataxia type 1 (SCA1) and the outcomes of IVF with PGT. METHODS PGT was performed for two unrelated couples from the Republic of Sakha (Yakutia) with the risk of SCA1 in one spouse. We have developed a system for PGT of a monogenic disease (PGT-M) for SCA1, which includes the analysis of a panel of 11 polymorphic STR markers linked to the ATXN1 gene and a pathogenic variant of the ATXN1 gene using nested PCR and fragment analysis. IVF/ICSI programs were performed according to standard protocols. Multiple displacement amplification (MDA) was used for whole genome amplification (WGA) and array comparative genomic hybridization (aCGH) for aneuploidy testing (PGT-A). RESULTS Eight STRs were informative for the first couple and ten for the second. Similarity of the haplotypes carrying pathogenic variants of the ATXN1 gene was noted. In the first case, during IVF/ICSI-PGT, three embryos reached the blastocyst stage and were biopsied. One embryo was diagnosed as normal by maternal STR haplotype and the ATXN1 allele. PGT-A revealed euploidy. The embryo transfer resulted in a singleton pregnancy, and a healthy boy was born. Postnatal diagnosis confirmed normal ATXN1. In the second case, two blastocysts were biopsied. Both were diagnosed as normal by PGT-M, but PGT-A revealed aneuploidy. CONCLUSION Birth of a healthy child after PGT for SCA1 was the first case of successful preimplantation prevention of SCA1 for the Yakut couple and the first case of successful PGT for SCA1 in Russia.
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Affiliation(s)
- Elena V Soloveva
- Research Institute of Medical Genetics, Tomsk National Research Medical Center of the Russian Academy of Sciences, Tomsk, Russia.
| | - Maria M Skleimova
- Research Institute of Medical Genetics, Tomsk National Research Medical Center of the Russian Academy of Sciences, Tomsk, Russia
| | - Larisa I Minaycheva
- Research Institute of Medical Genetics, Tomsk National Research Medical Center of the Russian Academy of Sciences, Tomsk, Russia
| | - Anna F Garaeva
- Research Institute of Medical Genetics, Tomsk National Research Medical Center of the Russian Academy of Sciences, Tomsk, Russia
| | - Daria I Zhigalina
- Research Institute of Medical Genetics, Tomsk National Research Medical Center of the Russian Academy of Sciences, Tomsk, Russia
| | - Egor O Churkin
- ART Center of the Siberian State Medical University of the Ministry of Health of Russia, Tomsk, Russia
| | - Yulia V Okkel
- ART Center of the Siberian State Medical University of the Ministry of Health of Russia, Tomsk, Russia
| | - Oksana S Timofeeva
- ART Center of the Siberian State Medical University of the Ministry of Health of Russia, Tomsk, Russia
- Department of Obstetrics and Gynecology of the Siberian State Medical University of the Ministry of Health of Russia, Tomsk, Russia
| | - Ilya A Petrov
- ART Center of the Siberian State Medical University of the Ministry of Health of Russia, Tomsk, Russia
- Department of Obstetrics and Gynecology of the Siberian State Medical University of the Ministry of Health of Russia, Tomsk, Russia
| | - Gulnara N Seitova
- Research Institute of Medical Genetics, Tomsk National Research Medical Center of the Russian Academy of Sciences, Tomsk, Russia
| | - Igor N Lebedev
- Research Institute of Medical Genetics, Tomsk National Research Medical Center of the Russian Academy of Sciences, Tomsk, Russia
| | - Vadim A Stepanov
- Research Institute of Medical Genetics, Tomsk National Research Medical Center of the Russian Academy of Sciences, Tomsk, Russia
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Krysa W, Sulek A, Rakowicz M, Szirkowiec W, Zaremba J. High relative frequency of SCA1 in Poland reflecting a potential founder effect. Neurol Sci 2016; 37:1319-25. [PMID: 27193757 PMCID: PMC4956719 DOI: 10.1007/s10072-016-2594-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2015] [Accepted: 04/26/2016] [Indexed: 11/02/2022]
Abstract
Spinocerebellar ataxias (SCAs) have irregular distributions worldwide. SCA1 is the most frequent in Poland, and no cases of SCA3 of Polish origin has yet been identified. In view of such patterns of SCAs occurrence, the relative frequency, geographical distribution and a possible founder effect of SCA1 were investigated. DNA samples of 134 probands with SCA1 and 228 controls were analysed. The genotyping of four markers, D6S89, D6S109, D6S274, D6S288, around the ATXN1 gene (SCA1) and sequencing of the selected variant of D6S89 were performed. The relative frequency of SCA1 was 68 %. The studied SCA1 pedigrees were irregularly distributed, with the highest concentration in Central Poland. Haplotyping revealed the association of ATXN1 gene mutation with a 197-bp variant of D6S89 marker (63 % of probands) and with a 184-bp variant of DS6274 (50.7 % of probands). Out of 61 SCA1 probands from Mazowieckie, 41 carried the same 197-bp variant. SCA1 relative frequency in Poland shows the highest value compared with the data from other countries worldwide. Due to the association with the mutation obtained for the investigated markers and the SCA1 pedigrees concentration in Central Poland, we hypothesise that it represents a potential founder effect.
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Affiliation(s)
- Wioletta Krysa
- Department of Genetics, Institute of Psychiatry and Neurology, Sobieskiego 9 Street, 02-957, Warsaw, Poland.
| | - Anna Sulek
- Department of Genetics, Institute of Psychiatry and Neurology, Sobieskiego 9 Street, 02-957, Warsaw, Poland
| | - Maria Rakowicz
- Department of Clinical Neurophysiology, Institute of Psychiatry and Neurology, Warsaw, Poland
| | - Walentyna Szirkowiec
- Department of Genetics, Institute of Psychiatry and Neurology, Sobieskiego 9 Street, 02-957, Warsaw, Poland
| | - Jacek Zaremba
- Department of Genetics, Institute of Psychiatry and Neurology, Sobieskiego 9 Street, 02-957, Warsaw, Poland
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Kononova SK, Sidorova OG, Fedorova SA, Platonov FA, Izhevskaya VL, Khusnutdinova EK. Bioethical issues of preventing hereditary diseases with late onset in the Sakha Republic (Yakutia). Int J Circumpolar Health 2014; 73:25062. [PMID: 25147769 PMCID: PMC4111875 DOI: 10.3402/ijch.v73.25062] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2014] [Revised: 06/30/2014] [Accepted: 07/02/2014] [Indexed: 11/29/2022] Open
Abstract
BACKGROUND Prenatal diagnosis of congenital and hereditary diseases is a priority for the development of medical technologies in Russia. However, there are not many published research results on bioethical issues of prenatal DNA testing. OBJECTIVE The main goal of the article is to describe some of the bioethical aspects of prenatal DNA diagnosis of hereditary diseases with late onset in genetic counselling practice in the Sakha Republic (Yakutia) - a far north-eastern region of Russia. METHODS The methods used in the research are genetic counselling, invasive chorionic villus biopsy procedures, molecular diagnosis, social and demographic characteristics of patients. RESULTS In 10 years, 48 (76%) pregnant women from families tainted with hereditary spinocerebellar ataxia type 1 and 15 pregnant women from families with myotonic dystrophy have applied for medical and genetic counselling in order to undergo prenatal DNA testing. The average number of applications is 7-8 per year. There are differences in prenatal genetic counselling approaches. CONCLUSION It is necessary to develop differentiated ethical approaches depending on the mode of inheritance, age of manifestation, and clinical polymorphism of hereditary disease.
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Affiliation(s)
- Sardana K. Kononova
- Yakutsk Scientific Center of Complex Medical Problems, Siberian Branch of the Russian Academy of Medical Sciences, Yakutsk, Russia
- Institute of Natural Sciences, M. K. Ammosov North-Eastern Federal University, Yakutsk, Russia
| | - Oksana G. Sidorova
- Yakutsk Scientific Center of Complex Medical Problems, Siberian Branch of the Russian Academy of Medical Sciences, Yakutsk, Russia
| | - Sardana A. Fedorova
- Yakutsk Scientific Center of Complex Medical Problems, Siberian Branch of the Russian Academy of Medical Sciences, Yakutsk, Russia
- Institute of Natural Sciences, M. K. Ammosov North-Eastern Federal University, Yakutsk, Russia
| | - Fedor A. Platonov
- Institute of Natural Sciences, M. K. Ammosov North-Eastern Federal University, Yakutsk, Russia
| | - Vera L. Izhevskaya
- Research Centre for Medical Genetics of the Russian Academy of Medical Sciences, Moscow, Russia
| | - Elza K. Khusnutdinova
- Institute for Biochemistry and Genetics, Ufa Scientific Centre of the Russian Academy of Sciences, Ufa, Russia
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Barashkov NA, Dzhemileva LU, Fedorova SA, Teryutin FM, Posukh OL, Fedotova EE, Lobov SL, Khusnutdinova EK. Autosomal recessive deafness 1A (DFNB1A) in Yakut population isolate in Eastern Siberia: extensive accumulation of the splice site mutation IVS1+1G>A in GJB2 gene as a result of founder effect. J Hum Genet 2011; 56:631-9. [PMID: 21776002 DOI: 10.1038/jhg.2011.72] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Hereditary forms of hearing impairment (HI) caused by GJB2 (Cx26) mutations are the frequent sensory disorders registered among newborns in various human populations. In this study, we present data on the molecular, audiological and population features of autosomal recessive deafness 1A (DFNB1A) associated with the donor splicing site IVS1+1G>A mutation of GJB2 gene in Yakut population isolate of the Sakha Republic (Yakutia) located in Eastern Siberia (Russian Federation). The Yakut population exhibits high frequency of some Mendelian disorders, which are rare in other populations worldwide. Mutational analysis of GJB2 gene in 86 unrelated Yakut patients with congenital HI without other clinical features has been performed. In this study, we registered a large cohort of Yakut patients homozygous for the IVS1+1G>A mutation (70 unrelated deaf subjects in total). Detailed audiological analysis of 40 deaf subjects with genotype IVS1+1G>A/IVS1+1G>A revealed significant association of this genotype with mostly symmetrical bilateral severe to profound HI (85% severe-to-profound HI versus 15% mild-to-moderate HI, P<0.05). The highest among six investigated Eastern Siberian populations carrier frequency of the IVS1+1G>A mutation (11.7%) has been found in Yakut population. Reconstruction of 140 haplotypes with IVS1+1G>A mutation demonstrates the common origin of all mutant chromosomes found in Yakuts. The age of mutation was estimated to be approximately 800 years. These findings characterize Eastern Siberia as the region with the most extensive accumulation of the IVS1+1G>A mutation in the world as a result of founder effect.
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Affiliation(s)
- Nikolay A Barashkov
- Department of Molecular Genetics, Yakut Scientific Centre of Complex Medical Problems, Siberian Branch of the Russian Academy of Medical Sciences, Yakutsk, Russian Federation.
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Moraes KCM. RNA surveillance: molecular approaches in transcript quality control and their implications in clinical diseases. Mol Med 2010; 16:53-68. [PMID: 19829759 PMCID: PMC2761007 DOI: 10.2119/molmed.2009.00026] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2009] [Accepted: 10/06/2009] [Indexed: 11/06/2022] Open
Abstract
Production of mature mRNAs that encode functional proteins involves highly complex pathways of synthesis, processing and surveillance. At numerous steps during the maturation process, the mRNA transcript undergoes scrutiny by cellular quality control machinery. This extensive RNA surveillance ensures that only correctly processed mature mRNAs are translated and precludes production of aberrant transcripts that could encode mutant or possibly deleterious proteins. Recent advances in elucidating the molecular mechanisms of mRNA processing have demonstrated the existence of an integrated network of events, and have revealed that a variety of human diseases are caused by disturbances in the well-coordinated molecular equilibrium of these events. From a medical perspective, both loss and gain of function are relevant, and a considerable number of different diseases exemplify the importance of the mechanistic function of RNA surveillance in a cell. Here, mechanistic hallmarks of mRNA processing steps are reviewed, highlighting the medical relevance of their deregulation and how the understanding of such mechanisms can contribute to the development of therapeutic strategies.
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Affiliation(s)
- Karen C M Moraes
- Molecular Biology Laboratory, IP&D, Universidade do Vale do Paraíba, São José dos Campos, São Paulo, CEP-12244-000, Brazil.
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Abstract
The group of spinocerebellar ataxias (SCAs) includes more than 20 subgroups based only on genetic research. The "ataxia genes" are autosomal; the "disease-alleles" are dominant, and many of them, but not all, encode a protein with an abnormally long polyglutamine domain. In DNA, this domain can be detected as an elongated CAG repeat region, which is the basis of genetic diagnostics. The polyglutamine tails often tend to aggregate and form inclusions. In some cases, protein-protein interactions are the key to understanding the disease. Protein partners of ataxia proteins include phosphatases and components of chromatin and the transcriptional machinery. To date, investigation of spinocerebellar ataxias involves population genetics, molecular methods, and studying model organisms. However, there is still no efficient therapy for patients. Here, we review the genetic and molecular data gained on spinocerebellar ataxias.
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Affiliation(s)
- Viktor Honti
- Department of Neurology, Albert Szent-Györgyi Medical and Pharmaceutical Center, University of Szeged, Szeged, Hungary.
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Goldfarb LG, Vasconcelos O, Platonov FA, Lunkes A, Kipnis V, Kononova S, Chabrashvili T, Vladimirtsev VA, Alexeev VP, Gajdusek DC. Unstable triplet repeat and phenotypic variability of spinocerebellar ataxia type 1. Ann Neurol 1996; 39:500-6. [PMID: 8619528 DOI: 10.1002/ana.410390412] [Citation(s) in RCA: 73] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
A Siberian kindred with spinocerebellar ataxia genetically linked to the SCA1 locus on chromosome 6p has been screened for the CAG triplet expansion within the coding region of the SCA1 gene. The kindred includes 1,484 individuals, 225 affected and 656 at risk, making this collection the largest spinocerebellar ataxia type 1 (SCA1) pedigree known. Each of the studied 78 SCA1 patients carried an expanded allele containing a stretch of 39 to 72 uninterrupted CAG repeats. Normal alleles had 25 to 37 trinucleotide repeats. Expanded alleles containing 40 to 55 repeats were found in 26 at-risk relatives. The number of CAG repeats in the mutated allele was inversely correlated with age at disease onset. Cerebellar deficiency was present in each patient and its severity was moderately affected by the number of CAG repeats. In contrast, the associated signs, dysphagia, diffuse skeletal muscle atrophy with fasciculations, and tongue atrophy were absent or mild in patients with low CAG repeat numbers, but severely complicated the course of illness in patients with a larger number of repeat units. One female mutation carrier was asymptomatic at age 66, more than 2 standard deviations beyond the average age of risk, suggesting incomplete penetrance. In 2 symptomatic individuals who had an expanded number of CAG repeats on both chromosomes, age at onset, rate of progression, and clinical manifestation corresponded to the size of the larger allele.
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Affiliation(s)
- L G Goldfarb
- Laboratory of Central Nervous System Studies, National Institute of Neurological Disorders and Stroke, Bethesda, MD USA
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