Genetic screening of an endemic mutation in the DYSF gene in an isolated, mountainous population in the Republic of Dagestan

Autor: Sergey N. Bardakov, Roman V. Deev, Аrtur А. Isaev, Nikita N. Khromov‐Borisov, Evgeniy D. Kopylov, Мaria R. Savchuk, Maxim S. Pushkin, Evgeniy V. Presnyakov, Raisat M. Magomedova, Patimat G. Achmedova, Zoya R. Umakhanova, Vladimir S. Kaimonov, Elizaveta V. Musatova, Konstantin А. Blagodatskikh, Aleksandra А. Tveleneva, Yana V. Sofronova, Ivan A. Yakovlev
Jazyk: angličtina
Rok vydání: 2023
Předmět:
Zdroj: Molecular Genetics & Genomic Medicine, Vol 11, Iss 10, Pp n/a-n/a (2023)
Druh dokumentu: article
ISSN: 2324-9269
DOI: 10.1002/mgg3.2236
Popis: Abstract Background Dysferlinopathy has a high prevalence in relatively isolated ethnic groups where consanguineous marriages are characteristic and/or the founder effect exists. However, the frequency of endemic mutations in most isolates has not been investigated. Methods The prevalence of the pathological DYSF gene variant (NM_003494.4); c.200_201delinsAT, p. Val67Asp (rs121908957) was investigated in an isolated Avar population in the Republic of Dagestan. Genetic screenings were conducted in a remote mountainous region characterized by a high level of consanguinity among its inhabitants. In total, 746 individuals were included in the screenings. Results This pathological DYSF gene variant causes two primary phenotypes of dysferlinopathy: limb‐girdle muscular dystrophy (LGMD) type R2 and Miyoshi muscular dystrophy type 1. Results indicated a high prevalence of the allele at 14% (95% confidence interval [CI]: 12–17; 138 out of 1518 alleles), while the allele in the homozygous state was detected in 29 cases—3.8% (CI: 2.6–5.4). The population load for dysferlinopathy was 832.3 ± 153.9 per 100,000 with an average prevalence of limb‐girdle muscular dystrophies ranging from 0.38 ± 0.38 to 5.93 ± 1.44 per 100,000. Conclusion A significant burden of the allele was due to inbreeding, as evidenced by a deficiency of heterozygotes and the Wright fixation index equal to 0.14 (CI 0.06–0.23).
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