中国人vonHippel-Lindau病家系致病基因大片段缺失研究

Large germline deletion of the VHL gene in Chinese families with yon Hippel-Lindau syndrome

目的研究中国人vonHippel—Lindau病（yonHippel—Lindausyndrome，VHL）家系致病基因大片段缺失情况及其表型特点。方法采用通用引物荧光定量PCR（universalprimerquantitative11uorescentmultiplexpolymerasechainreaction，UPQFM—PCR）技术结合GeneScan分析系统对新发现的20个VHL病家系的先证者及部分自愿者进行VHL基因胚系突变大片段缺失检测。结果20例先证者中检测到VHL基因大片段缺失6例，其中第1外显子缺失3例、第3外显子缺失1例、VHL基因完全缺失2例。进一步检测其中2个家系其他患者和部分成员也存在与先证者相同的VHL基因缺失。2个VHL基因完全缺失的家系，其患者表现为中枢神经系统血管母细胞瘤和视网膜血管瘤但无肾癌表型。结论中国汉族人VHL患者基因种系突变存在VHL基因大片段缺失；VHL病诊断应常规开展VHL基因大片段缺失检测；VHL基因完全缺失和中枢系统血管母细胞瘤和视网膜血管瘤可能存在一定关系并需进一步研究。

Objective To investigate the large germline deletion of the VHL gene in Chinese families with von Hippel-Lindau disease （VHL）. Methods The large deletion of the VHL gene in 20 unrelated Chinese VHL families was analyzed by using universal primer quantitative fluorescent multiplex polymerase chain reaction （UPQFM PCR） and GeneScan analysis. Results Partial and complete VHL gene deletions were detected in 6 probands, including 3 exon 1 deletions, 1 exon 3 and 2 complete deletions. Of the 2 families with the complete deletions, patients developed multi-centric hemangioblastoma in the retina and central nervous system （CNS）, and none developed renal cell carcinoma （RCC）. Conclusion Partial and complete VHL gene deletions could be detected in Chinese kindreds with von Hippel-Lindau disease and the test for large deletion of the VHL gene should be implemented in routine DNA diagnosis for VHL disease. Further investigations are required to confirm that entire VHL deletions may be associated with a high risk of hemangioblastomas in the retina and central nervous system.