HRD检测方法

HRD检测方法

HRD主要病因有3种:

①突变(包括胚系BRCA基因、胚系HR基因和体细胞HR基因),

②结构重排(LOH,杂合性丢失;TAI,端粒等位基因失平衡;LST,大片段迁移),

③表观遗传修饰(启动子甲基化)。

1:Loss of Heterozygosity杂合性缺失:1)长于15Mb,2)短于整个染色体LOH区域数量

Abkevich V, Timms K M, Hennessy B T, et al. Patterns of genomic loss of heterozygosity predict homologous recombination repair defects in epithelial ovarian cancer[J]. British journal of cancer, 2012, 107(10): 1776-1782.

2:Large Scale Transitions (LST)大片端迁移:过滤掉小于3 Mb的区域后,超过10 Mb的区域之间的断点数量
Popova, T., E. Manie, G. Rieunier, V. Caux-Moncoutier, C. Tirapo, T. Dubois, O. Delattre, et al. 2012. “Ploidy and large-scale genomic instability consistently identify basal-like breast carcinomas with BRCA1/2 inactivation.” Cancer Res. 72 (21): 5454–62.

3:Telomeric Allelic Imbalances(TAI)端粒等位基因不平衡:1)延长至亚端粒之一;2)不穿过

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