摘要
目的 :研究中国汉族家族性乳腺癌 (familiarbreastcancer ,FBC)患者BRCA1的突变情况。方法 :选取中国汉族 9个乳腺癌家系中各 1例乳腺癌患者 ,1例无肿瘤家族史的正常人 ,32例散发性乳腺癌患者和 33例正常献血者。从外周血淋巴细胞中提取DNA ,经PCR扩增后 ,以变性高效液相色谱 (denaturinghighperformanceliquidchromatography ,DHPLC)初筛BRCA1所有编码外显子及部分内含子的多态性 ,对异常峰型者直接测序。 结果 :在9例家族性乳腺癌患者中 ,1例患者在外显子 11上发现一处致病性突变 (3870delTGTC) ,该突变因缺失 4个碱基导致框架移位。 1例患者发现尚未见报道的密码子 86 7单个碱基替换导致编码氨基酸的变异 (E86 7R)。 8例患者在内含子 18(IVS18+6 5 )上检出已知的G→A变异 ,变异率为 88.9% (8/ 9)。该位点变异在散发性乳腺癌和一般人群中的检出率分别为 37.5 % (12 / 32 )和 33.3% (11/ 33)。该 8例患者同时检出密码子 871已知的错义变异(P871L)与内含子 9(IVS8 5 7delT)的变异 ,且有 1例患者在此 3处的变异为纯合变异。这 8例患者的检测结果提示 ,IVS18+6 5G→A、IVS8 5 7delT与 2 731C→T这 3个位点存在连锁。该连锁情况尚未见报道。 2例患者在密码子 14 36发现已知为多态的改变 (S14 36S)。 1例患?
Objective: To analyze the mutations of BRCA1 in 9 Chinese familiar breast cancer patients. Methods: Peripheral blood samples were obtained from 9 patients enrolled from 9 breast cancer families, one normal control, 32 sporadic breast cancer patients and 33 normal donors. DNA extracted from lymphocytes was amplified by polymerase chain reaction (PCR). The 22 exons and partial introns of BRCA1 were screened by PCR denaturing high performance liquid chromatography (PCR-DHPLC) and confirmed by direct sequencing. Results: Among these 9 familiar breast cancer patients, a deleterious mutation was detected in one case in exon 11 (3870delTGTC) which was a 4 base deletion and caused a frameshift in turn. One novel and unique amino acid substitution (E867R) was detected in one case. Eight patients were detected to have a known variation in intron 18 (IVS18+65G→A), and the ratio of this variation detected was 88.9%(8/9). The ratio of this variation was 37.5%(12/32) in sporadic breast cancer patients or 33.3%(11/33) in normal control. This variation was found to be accompanied all the time with a known missense variation in exon 11 (P871L) and a polymorphism in intron 9 (IVS8 57delT). Those three variants were also detected in homozygous in one case, which implies the linkage of the 3 sites. The linkage had not been reported. Two patients had been found with a known polymorphism in exon 13 (S1436S). Another known polymorphism was found in one case (L771L). In addition, intronic variants (IVS2+48C→T, IVS2+133C→T, IVS12+112C→A) were detected. Conclusion: The mutations of BRCA1 in Chinese familiar breast cancer patients are different from the hot spots reported in Caucasian and Jewish. It is important that further study be conducted to seek for specific mutations of this gene or other possible relevant genes in Chinese familiar breast cancer patients.
出处
《北京大学学报（医学版）》
CAS
CSCD
北大核心
2003年第4期373-376,共4页
Journal of Peking University:Health Sciences
