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A novel likely pathogenic PLCG2 variant in a patient with a recurrent skin blistering disease and B-cell lymphopenia.
European Journal of Medical Genetics 2021 November 10
Pathogenic variants of PLCG2 encoding phospholipase C gamma 2 (PLCγ2) were first reported in 2012 and their clinical manifestations vary widely. PLCG2-associated antibody deficiency and immune dysregulation (PLAID) and autoinflammation and PLCγ2-associated antibody deficiency and immune dysregulation (APLAID) are representative examples of PLCG2 pathogenic variants. In this report, we describe a 17-year-old male with recurrent blistering skin lesions, B-cell lymphopenia, and asthma. Distinct from the patients in previous reports, this patient had the heterozygous de novo c.2119T > C missense variant (NM_002661.4) resulting in a serine to proline amino acid substitution (p.Ser707Pro). The variant located to the PLCγ2 C-terminal Src homology 2 (cSH2) domain, which is a critical site for the restriction of intrinsic enzyme activity. This variant could be classified as "likely pathogenic" according to American College of Medical Genetics and Genomics guidelines. Laboratory results showed a reduction in circulating B cells without a decrease of serum IgG and IgA. Our findings expand the variety of clinical phenotypes for PLCG2 missense variants.
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