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A MYH3 mutation identified for the first time in a Chinese family with Sheldon-Hall syndrome (DA2B).
Neuromuscular Disorders : NMD 2018 May
Sheldon-Hall syndrome is the most common type of distal arthrogryposis syndromes, also known as distal arthrogryposis 2B (DA2B). Sheldon-Hall syndrome is caused by mutations in the TPM2, TNNI2, TNNT3 or MYH3 gene and characterized by ulnar deviation, camptodactyly, overlapping fingers and scoliosis from birth. We investigated a Chinese family with multiple members who clinically presented with distal arthrogryposis of the hands. In total, 261 subjects including one proband and ten family members from the non-consanguineous Chinese family and 250 healthy volunteers were included and had their genomic DNA extracted. A novel missense mutation in exon 13 of the MYH3 gene, c.1160A > G (p.Tyr387Cys), was identified in the proband and his father through whole-exome sequencing. The proband and six affected family members were confirmed to carry this mutation by Sanger sequencing, although the mutation was not detected in the four unaffected individuals or 250 volunteers. This is the first report of a novel MYH3 mutation being identified as the cause of DA2B in a Chinese family. Our findings confirm that MYH3 gene mutations can be a pathogenic cause of DA2B in Asian patients. This study increases the mutational spectrum in MYH3 and aids genetic counseling and prenatal diagnosis.
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