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Mutation Analysis of the ATP7B Gene in Seven Chinese Families with Wilson's Disease.
Digestion 2018 November 2
BACKGROUND: Wilson's disease (WD) is an autosomal recessive disease, which is characterized by an excessive copper accumulation in the liver and brain, leading to subsequent hepatic and/or neurological disorders. The causative gene for WD has been identified as the ATPase Cu2+ transporting beta polypeptide gene (ATP7B), which encodes a protein called copper-transporting ATPase 2. ATP7B mutations may lead to reduced biliary excretion of excess copper and disrupted copper homeostasis, resulting in various clinical symptoms of WD.
METHODS: Direct sequencing of the ATP7B gene was performed in 7 Han Chinese families with WD, and haplotype analysis was conducted in families having the same mutation.
RESULTS: Nine ATP7B gene mutations were identified, including 7 missense mutations (p.Asp765Gly, p.Arg778Leu, p.Thr888Pro, p.Pro992Leu, p.Asp1047Val, p.Ile1148Thr and p.Ala1295Val), 1 duplication mutation (c.525dupA), and 1 nonsense mutation (p.Gly837*). Combined with our previous data, haplotype analysis revealed that the founder effect accounted for 48% of alleles in Han Chinese, constituted by high allele frequency mutations p.Arg778Leu, p.Pro992Leu and p.Ala1295Val.
CONCLUSION: This study revealed genetic defects of 7 Han Chinese families with WD, and has implications for their genetic counseling and clinical management.
METHODS: Direct sequencing of the ATP7B gene was performed in 7 Han Chinese families with WD, and haplotype analysis was conducted in families having the same mutation.
RESULTS: Nine ATP7B gene mutations were identified, including 7 missense mutations (p.Asp765Gly, p.Arg778Leu, p.Thr888Pro, p.Pro992Leu, p.Asp1047Val, p.Ile1148Thr and p.Ala1295Val), 1 duplication mutation (c.525dupA), and 1 nonsense mutation (p.Gly837*). Combined with our previous data, haplotype analysis revealed that the founder effect accounted for 48% of alleles in Han Chinese, constituted by high allele frequency mutations p.Arg778Leu, p.Pro992Leu and p.Ala1295Val.
CONCLUSION: This study revealed genetic defects of 7 Han Chinese families with WD, and has implications for their genetic counseling and clinical management.
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