家族性良性天疱疮患者ATP2C1基因突变研究

Mutation analysis of ATP2CI gene in Chinese families with Harley-Harley disease

目的 探讨3个家族性良性天疱疮家系和1例散发患者的ATP2C1基因突变.方法 采取家系中患病成员外周血,应用外周血细胞DNA抽提、PCR扩增和DNA直接测序等方法检测ATP2C1基因突变情况,用反向测序验证突变,用100例无血缘关系个体作正常人对照.结果 在2个家族性良性天疱疮家系和1例散发患者中发现3个未曾报道的错义突变.家系1第20外显子2048位碱基G→A,导致错义突变R619K;家系2第8外显子853位碱基A→C,导致错义突变T221P;散发患者第23外显子2323位碱基T→C,导致错义突变Y711H.家系中非患病成员和100例无血缘关系正常人均未发现这些改变.在1个家族性良性天疱疮家系未检测到基因突变.结论 发现家族性良性天疱疮3种新的ATP2C1基因突变位点.

Objective To detect the mutations in ATP2C1 gene in 3 Chinese Hailey-Hailey-disease （HHD） families and 1 sporadic HHD patient.Methods Three Chinese HHD families and 1 sporadic HHD patient were recruited into this study with informed consent.Blood samples were taken from the patients with HHD,unaffected individuals in the HHD families and 100 unrelated normal human controls.Genomic DNA was extracted from these blood samples.All the exons and exon-intron boundaries of the ATP2C1 gene were amplified by PCR followed by direct sequencing via dye-termination chemistry.Results Three novel missense mutations in ATP2C1 gene were identified,including a 2048 G→A mutation in exon 20 causing the substitution of arginine by lysine at position 619 in the patients from HHD family 1,853A→C mutation in exon 8 causing the substitution of threonine by proline at position 221 in the patients from family 2,and 2323T→C mutation in exon 23 causing the substitution of tyrosine by histidine at position 711.None of these mutations were found in patients from the HHD family 3,unaffected individuals from the HHD family 1 and 2,or the unrelated normal human controls.Conclusion Three novel missense mutations are identified in the ATP2C 1 gene of patients with HHD.