Microsatellite instability in the peripheral blood leukocytes of HNPCC patients.

Microsatellite instability in the peripheral blood leukocytes of HNPCC patients.
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DOI:
10.1002/humu.21190
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发表时间:
2010-03
期刊:
影响因子:
3.9
通讯作者:
Siciliano, Michael J.
Siciliano, Michael J.
中科院分区:
医学2区
文献类型:
--
作者:
Coolbaugh-Murphy, Mary I.;Xu, Jing-Ping;Ramagli, Louis S.;Ramagli, Brian C.;Brown, Barry W.;Lynch, Patrick M.;Hamilton, Stanley R.;Frazier, Marsha L.;Siciliano, Michael J.

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大多数遗传性非息肉病性结直肠癌(HNPCC)患者遗传了错配修复(MMR)基因的缺陷等位基因,通常是MLH 1或MSH 2,导致肿瘤中高水平的微卫星不稳定性(MSIH)。突变携带者正常组织中MSI的存在一直存在争议。在这里,我们直接比较MSI的外周血白细胞(PBL)DNA的7例HNPCC患者携带不同类型的致病性MMR突变MLH 1和MSH 2基因与PBL DNA的正常年龄匹配的控制和散发性结直肠癌(SCRC)的患者。使用小池PCR(SP-PCR)研究大多数样本中三个微卫星基因座,每个基因座至少有100个等位基因。每个HNPCC患者的突变微卫星片段的平均频率(0.04-0.24)显著高于其年龄匹配的正常对照(突变频率(MF)为0.00 - 0.06)或SCRC患者(MF为0.01-0.03)(p<0.01)。这些数据支持的结论,较高的MF在PBL DNA的HNPCC患者是真实的和可重复的,可能会有所不同的程度,根据类型的生殖系MMR突变和个人的年龄,并提供了一个可能的遗传解释的预期在HNPCC家庭。
Most hereditary nonpolyposis colorectal cancer (HNPCC) patients inherit a defective allele of a mismatch repair (MMR) gene, usually MLH1 or MSH2, resulting in high levels of microsatellite instability (MSIH) in the tumors. Presence of MSI in the normal tissues of mutation carriers has been controversial. Here we directly compare MSI in the peripheral blood leukocyte (PBL) DNA of seven HNPCC patients carrying different types of pathogenic MMR mutations in MLH1 and MSH2 genes with the PBL DNA of normal age-matched controls and of patients with sporadic colorectal cancer (SCRC). Small pool PCR (SP-PCR) was used studying three microsatellite loci for at least 100 alleles each in most samples. The average frequencies of mutant microsatellite fragments in each HNPCC patient (0.04–0.24) were significantly higher (p<0.01) relative to their age-matched normal controls with mutant frequencies (MF) from 0.00 to 0.06, or SCRC patients (MF from 0.01–0.03). The data support the conclusions that higher MF in the PBL DNA of HNPCC patients is real and reproducible, may vary in extent according to the type of germline MMR mutation and the age of the individual, and provide a possible genetic explanation for anticipation in HNPCC families.
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