ArticleZhong nan da xue xue bao. Yi xue ban = Journal of Central South University. Medical sciences2021
POMT1 and POMT2 gene mutations result in 2 cases of
Article in Zhong nan da xue xue bao. Yi xue ban = Journal of Central South University. Medical sciences, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Alpha-dystroglycanopathy (α-DGP) is a group of congenital muscular dystrophy and limb band muscular dystrophy caused by abnormal glycosylation of α-dystroglycan (α-DG). At present, there are few studies on the clinical manifestations, genetic characteristics, and diagnostic methods for α-DGP in China. Two cases of α-DGP caused by POMT1 and POMT2 gene mutations in the protein O-mannosyltransferases (PMTs) family were admitted to the Department of Pediatrics, Xiangya Hospital, Central South University. The 2 patients showed exercise retardation, with or without mental retardation. Serum level of creatine kinase (CK) was increased significantly. Electromyography showed myogenic impairment. Muscle biopsy was consistent with myopathy. Genetic test showed that both patients had compound heterozygous mutations, and the parents of the 2 patients were heterozygous with one of the mutations. There were c.824+1G>A, splicing and c.1777G>A, p.A593T in POMT1 gene, and c.604T>G, p.F202V and c.868C>T, p.P290S in POMT2 gene. The online database was used to predict the mutation sites and suggested the pathogenicity. Finally, one patient was diagnosed as congenital muscular dystrophy with mental retardation (CMD-MR) and the other was dystrophytype 2N (LGMD2N). PMTs family has similar sequences. Gene mutations can lead to different degrees of muscular dystrophy with the increase of serum level of CK. α-DG is easy to be misdiagnosed. Genetic examination is beneficial to early diagnosis, prognosis, and genetic counseling.
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