对创始BRCA2双突变与单突变携带者的比较分析显示,没有额外的临床风险
Gemma Caliendo1, Chiara Della Pepa2, Marialaura Zitiello3
1Unit of Clinical and Molecular Pathology, AOU University of Campania "Luigi Vanvitelli", Address: S. Andrea delle Dame - Via L. De Crecchio, 7 - 80138, Napoli, Italy.
这项研究发现,意大利南部的一个特定的BRCA2双基因突变可能具有创始人效应. 与单个BRCA2突变相比,双重突变没有增加癌症风险或严重程度.
科学领域:
- 遗传学 遗传学 是一个
- 在瘤学瘤学.
- 分子生物学分子生物学
背景情况:
- 同一个BRCA基因内的cis中双重突变 (DMs) 是罕见的.
- 与单一致病变体 (PVs) 相比,BRCA DMs的临床意义和癌症风险尚不清楚.
研究的目的:
- 为了研究特定的BRCA2双突变 (c.631G>A/c.7008-2A>T) 的临床意义.
- 为了确定这个BRCA2 DM是否与单个BRCA2 PVs相比,赋予了附加性癌症风险.
主要方法:
- 对1722名怀疑遗传性乳腺和卵巢癌 (HBOC) 的患者进行了回顾性分析.
- 确定了9个无关的试剂,具有相同的BRCA2 DM (c.631G>A/c.7008-2A>T) 在cis中共分离.
- 将DM组与携带单个BRCA2 PV的19个对照组进行了比较.
主要成果:
- BRCA2 DM队列起源于意大利南部,这表明了创始人效应.
- 在DM和单一PV组之间没有观察到乳腺癌发病时的年龄,瘤谱,阶段或激素受体配置的显著差异.
- 在这两组中,与BRCA2相关的乳腺癌主要是激素受体阳性.
结论:
- 在意大利南部,BRCA2双重突变c.631G>A/c.7008-2A>T可能具有创始人效应.
- 这两种BRCA2变异的共存似乎不会增加癌症风险或导致比单个BRCA2突变更严重的表型.
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