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  • Title: Robust genotyping tool for autosomal recessive type of limb-girdle muscular dystrophies.
    Author: Inashkina I, Jankevics E, Stavusis J, Vasiljeva I, Viksne K, Micule I, Strautmanis J, Naudina MS, Cimbalistiene L, Kucinskas V, Krumina A, Utkus A, Burnyte B, Matuleviciene A, Lace B.
    Journal: BMC Musculoskelet Disord; 2016 May 04; 17():200. PubMed ID: 27142102.
    Abstract:
    BACKGROUND: Limb-girdle muscular dystrophies are characterized by predominant involvement of the shoulder and pelvic girdle and trunk muscle groups. Currently, there are 31 genes implicated in the different forms of limb-girdle muscular dystrophies, which exhibit similar phenotypes and clinical overlap; therefore, advanced molecular techniques are required to achieve differential diagnosis. METHODS: We investigated 26 patients from Latvia and 34 patients from Lithuania with clinical symptoms of limb-girdle muscular dystrophies, along with 565 healthy unrelated controls from general and ethnic populations using our developed test kit based on the Illumina VeraCode GoldenGate genotyping platform, Ion AmpliSeq Inherited Disease Panel and direct sequencing of mutations in calpain 3 (CAPN3), anoctamin 5 (ANO5) and fukutin related protein (FKRP) genes. RESULTS: Analysis revealed a homozygous CAPN3 c.550delA mutation in eight patients and three heterozygous variants in controls: dysferlin (DYSF) c.5028delG, CAPN3 c.2288A > G, and FKRP c.135C > T. Additionally, three mutations within FKRP gene were found: homozygous c.826C > A, and two compound - c.826C > A/c.404_405insT and c.826C > A/c.204_206delCTC mutations, and one mutation within CLCN1 gene - c.2680C > T p.Arg894Ter. ANO5 c.191dupA was not present. CONCLUSIONS: Genetic diagnosis was possible in 12 of 60 patients (20%). The allele frequency of CAPN3 gene mutation c.550delA in Latvia is 0.0016 and in Lithuania - 0.0029. The allele frequencies of CAPN3 gene mutation c.2288A > G and DYSF gene mutation c.4872delG are 0.003.
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