一个汉族自闭症谱系障碍家系的拷贝数变异分析

Copy number variation analysis of a Chinese Han family with autism spectrum disorder

目的 对一个中国汉族自闭症谱系障碍（autistic spectrum disorder,ASD）家系进行拷贝数变异（copy number variation,CNV）的分析.方法 该家系共3例患者.建立家系成员EB病毒转染永生化的B淋巴细胞系,并提取基因组进行核型分析与Affymatrix 500k SNP芯片检测,所获结果由Genotyping Console与GeneChip（R）Chromosome Copy Number Analysis Tool软件分析,采用家系中3名正常儿童作为对照,对患者中的拷贝数变异进行分析.结果 核型分析未发现染色体变异情况,而15q11位点在患者中都存在拷贝数变异,其中物理位置为19827281-19998230的片段出现了拷贝数减少,含有OR11K1P、OR4Q1P、OR4H6P、OR4M2、OR4N3P等基因,而另外3条分别为37 kb、1316 kb、37 kb的片段则出现了拷贝数增加,含有LOC388079、LOC441709等基因.结论 位于这一拷贝数变异位点上有OR11K1P、OR4Q1P、OR4H6P、OR4M2等嗅觉受体基因,也有功能未明的LOC388079基因,为自闭症的遗传机理研究提供了新的提示.

Objectve To study the copy number variation （CNV） in a Chinese Han autistic spectrum disorder （ASD） pedigree. Methods The pedigree involved six siblings, and three of them were autistic. B lymphocytes of the pedigree were immortalized with EBV and used as studying materials. Karyotyping and Affymatrix 500k SNP chip assay were performed to assess the genetic defects among the members of the pedigree. Results Karyotyping indicated that the chromosomes were normal. However, the 15q11 locus was located as de novo CNV region in all autistic siblings of the pedigree. In this locus, the fragment in 19827281-19998230 illustrated ＂loss＂ of CNV, while other three fragments with 37 kb, 1316 kb and 37 kb indicated ＂gain＂ of CNV. Conclusion In this study, olfactory genes OR11K1P, OR4Q1P, OR4H6P,OR4M2, etc. in the sites with loss and gain of CNV may provide a new clue for genetic research of autism spectrum disorder.