中国人肢带型肌营养不良症粘附蛋白基因突变鉴定

目的肢带型肌营养不良症（ＬＧＭＤ）是常见的常染色体遗传肌肉病，特点为髋肩带肌无力、萎缩，进行性发展至远端肌肉，男女均可受累，有明显的遗传异质性，国外研究发现重型ＬＧＭＤ分别涉及１３ｑ１２、１７ｑ２１、４ｑ１２、５ｑ３３区域编码γ－、α－、β－、δ－糖蛋白的４个基因座位。中国人群中ＬＧＭＤ的致病基因研究尚无报道，拟通过粘附蛋白（ａｄｈａｌｉｎ）基因突变的检测，鉴定其致病基因。方法用ＰＣＲ－ＳＳＣＰ及ＤＮＡ测序法对ａｄｈａｌｉｎ基因第２、３外显子进行了突变检测及鉴定。结果发现１例散发的９岁女患者ａｄｈａｌｉｎ第２、３外显子存在纯合Ａｒｇ７７Ｃｙｓ突变，此突变在本实验的４０条野生染色体中未发现。结论发现中国人群中重型ＬＧＭＤ（ＤＬＭＤ）存在ａｄｈａｌｉｎ基因突变。提示１７ｑ２１区的ａｄｈａｌｉｎ基因是中国人ＬＧＭＤ的一个致病基因。

IDENTIFICATION OF ADHALN GENE MUTATION IN LIMB GIRDLE MUSCULAR DYSTROPHY IN CHINESE

Objective Limb girdle muscular dystrophy(LGMD) is a group of severe genetic heterogeneity muscular diseases characterized by proximal muscular weakness of the pelvis and shoulder, affecting both male and female. This group of diseases involves four gene loci (13q12,17q21,4q12,5q33). Up till now there is no research report about LGMD in Chinese. This study was intended to identify the pathogenic genes of LGMD in Chinese by mutation detecting.Methods The exons 2 and 3 of adhalin gene were analyzed in 13 Chinese LGMD patients and 20 controls by using PCR SSCP and DNA sequencing.Results The R77C(Arg77Cys) missense mutation was found at the two alleles of a 9 year old LGMD girl, which had not been found in the 40 wild type chromosomes. This is the first report on adhalin mutation that exists in LGMD in Chinese.Conclusion Our results suggest that adhalin gene is one of the predisposing genes in LGMD in Chinese.