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使用ACMG/AMP指南进行分离预测,分离试验和变异分类:在BRCA1和BRCA2变异中观察到的挑战

Marta Santamariña^1,2,3, Olivia Fuentes-Ríos^1,2, Ana Blanco-Pérez^1,2

¹Fundación Pública Galega de Medicina Xenómica (FPGMX), Servicio Galego de Saúde (SERGAS), Santiago de Compostela, Spain.

Clinical chemistry

|January 7, 2026

概括

研究BRCA1和BRCA2基因变异,这项研究分析了遗传性癌症中的拼接缺陷. 结果改进了变异分类,改善了对患者的遗传风险评估.

科学领域:

遗传学是一个遗传学.
在瘤学瘤学.
分子生物学分子生物学

背景情况:

在BRCA1和BRCA2基因中的生殖系变异是遗传性乳腺和卵巢癌的关键驱动因素.
异常拼接是一种常见的机制,但对拼接性变体进行分类是具有挑战性的.
由于有限的实验数据和解释框架的局限性,许多变体仍然具有不确定的意义.

研究的目的:

研究BRCA1和BRCA2基因中的17个特定变异的拼接结果.
在怀疑遗传性乳腺和/或卵巢癌的家庭中确定这些变异的致病性.
改进变种分类和改进遗传风险评估.

主要方法:

使用载体衍生mRNA或拼接-报告员小基因试验检查了10个BRCA1和7个BRCA2变异的拼接结果.
应用了基于ACMG/AMP指南的PVS1_(RNA) 标准.
将实验发现与现有数据结合起来,用于变体解释.

主要成果:

8种变体显示异常拼接,而9种变体显示没有拼接效应.
由于剩余的全长转录或内部错误拼接的异型,有时会阻止PVS1_(RNA) 标准的完全应用.
将变异分为致病性,可能致病性,良性,可能良性和不确定的意义类别.

结论:

将4个变异分类为致病性/可能致病性,10个变异分类为良性/可能良性,3个变异分类为不确定的重要性.
证明了结合实验和计算证据用于变体解释的价值.
完善了BRCA1和BRCA2变异的临床分类,提高了遗传性癌症风险评估.

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Splicing is the process by which eukaryotic RNA is edited before its translation into protein. The RNA strand transcribed from eukaryotic DNA is called the primary transcript. The primary transcripts that become mRNAs are called precursor messenger RNAs (pre-mRNAs). Eukaryotic pre-mRNA contains alternating sequences of exons and introns. Exons are nucleotide sequences that code for proteins, whereas introns are the non-coding regions. In RNA splicing, introns are removed and exons are bonded...