Mutation analysis of the CHK2 gene in breast carcinoma and other cancers.

Mutation analysis of the CHK2 gene in breast carcinoma and other cancers.
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DOI:
10.1186/bcr435
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发表时间:
2002
期刊:
Breast cancer research : BCR
影响因子:
--
通讯作者:
Bergthorsson JT
Bergthorsson JT
中科院分区:
其他
文献类型:
--
作者:
Ingvarsson S;Sigbjornsdottir BI;Huiping C;Hafsteinsdottir SH;Ragnarsson G;Barkardottir RB;Arason A;Egilsson V;Bergthorsson JT

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据报道,Li-Fraumeni 综合征家族中染色体 22q12.1 处的 CHK2 基因发生突变。 Chk2 是一种效应激酶,在 DNA 损伤时被激活,并参与细胞周期途径和 p53 途径。我们使用 7 个微卫星标记筛选了 139 个乳腺肿瘤的 22q 染色体杂合性缺失,并通过单链构象多态性和 DNA 测序筛选了 119 个乳腺肿瘤的 CHK2 基因突变。 139 例散发性乳腺肿瘤中的 74 例(53%)显示至少一种标志物杂合性丢失。对这些样本和来自携带 BRCA2 999del5 突变个体的 45 个肿瘤进行了 CHK2 基因突变筛查。除了非编码外显子和内含子 2 中短单核苷酸重复中推定的多态性区域外,还在第一个编码外显子中检测到种系变异 (T59K)。在对 1172 名癌症患者进行 T59K 序列变异筛查时,总共在 4 名乳腺癌患者、2 名结肠癌患者、1 名胃癌患者和 1 名卵巢癌患者中检测到 T59K 序列变异,但在 452 名健康个体中未检测到。还检测到内含子 8 中 +3 位点的肿瘤特异性 5' 剪接位点突变 (TTgt [a → c]atg)。我们的结论是体细胞 CHK2 突变在乳腺癌中很少见,但我们的结果表明 CHK2 在一小部分乳腺肿瘤中具有肿瘤抑制功能。此外,我们的结果表明,T59K CHK2 序列变体对于肿瘤生长来说是一种低外显率等位基因。
Mutations in the CHK2 gene at chromosome 22q12.1 have been reported in families with Li-Fraumeni syndrome. Chk2 is an effector kinase that is activated in response to DNA damage and is involved in cell-cycle pathways and p53 pathways. We screened 139 breast tumors for loss of heterozygosity at chromosome 22q, using seven microsatellite markers, and screened 119 breast tumors with single-strand conformation polymorphism and DNA sequencing for mutations in the CHK2 gene. Seventy-four of 139 sporadic breast tumors (53%) show loss of heterozygosity with at least one marker. These samples and 45 tumors from individuals carrying the BRCA2 999del5 mutation were screened for mutations in the CHK2 gene. In addition to putative polymorphic regions in short mononucleotide repeats in a non-coding exon and intron 2, a germ line variant (T59K) in the first coding exon was detected. On screening 1172 cancer patients for the T59K sequence variant, it was detected in a total of four breast-cancer patients, two colon-cancer patients, one stomach-cancer patient and one ovary-cancer patient, but not in 452 healthy individuals. A tumor-specific 5' splice site mutation at site +3 in intron 8 (TTgt [a → c]atg) was also detected. We conclude that somatic CHK2 mutations are rare in breast cancer, but our results suggest a tumor suppressor function for CHK2 in a small proportion of breast tumors. Furthermore, our results suggest that the T59K CHK2 sequence variant is a low-penetrance allele with respect to tumor growth.
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