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Resolving pathogenicity classification for the CDH1 c.[715G>A] (p.Gly239Arg) Variant
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https://doi.org/10.1038/s41431-021-00825-wAbstract
Hereditary Diffuse Gastric Cancer (HDGC) syndrome is associated with CDH1 germline likely pathogenic/pathogenic variants. Carriers of CDH1 germline likely pathogenic/pathogenic variants are predisposed to diffuse gastric cancer and lobular breast cancer. This study aims to classify the CDH1 c.[715G>A] missense variant identified in a diffuse gastric cancer prone family by performing splicing studies. RT-PCR and subsequent cloning experiments were performed to investigate whether this variant completely disrupts normal splicing. This variant preferentially abolishes normal splicing through activation of a cryptic 3' acceptor splice site within exon 6 of CDH1, presumably leading to a premature protein truncation within first extracellular domain repeat of E-cadherin protein. Our results contributed to evidence necessary to resolve pathogenicity classification of this variant, indicating that this variant is to be classified as pathogenic.
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