The c.386A>C p.(Asn129Thr) variant in SMAD4 is likely to be pathogenic, causing Juvenile Polyposis Syndrome. A case report of a mosaic variant.
Mol Genet Genomic Med
; 12(1): e2348, 2024 Jan.
Article
em En
| MEDLINE
| ID: mdl-38146137
ABSTRACT
BACKGROUND:
Juvenile Polyposis Syndrome (JPS) is a rare autosomal dominant hereditary disorder characterized by the development of multiple hamartomatous gastrointestinal polyps. Here, we present a case of JPS with a mosaic variant in SMAD4.METHODS:
Exome sequencing TRIO analysis, using germline DNA from the biological mother and father along with the index case (IC).RESULTS:
A 46-year-old male with no family history of cancer presented with chronic iron deficiency anemia and was diagnosed with massive gastric polyposis (≥100 polyps). At the age of 59, he underwent a total gastrectomy, revealing numerous polyps occupying the entire gastric mucosa, including a 5 cm gastric hyperplastic polyp with high-grade dysplasia and focal adenocarcinoma. TRIO analysis identified the c.386A>C p.(Asn129Thr) variant in the SMAD4 gene at an allele frequency (AF) of 22%, suggesting its mosaic origin. Subsequently, the variant was found in heterozygosity in the IC's son, who exhibited two subcentimeter polyps in the colon and seven inflammatory gastric polyps with gastric inflammatory areas and hyperplasia, suggesting that the c.386A>C p.(Asn129Thr) variant in SMAD4 segregated with the phenotype.CONCLUSION:
Our study provides evidence supporting the classification of the c.386A>C p.(Asn129Thr) variant in SMAD4 as a likely pathogenic variant. This finding contributes to improved accuracy in the diagnosis and genetic counseling of JPS.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Neoplasias Gástricas
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Síndromes Neoplásicas Hereditárias
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Pólipos Adenomatosos
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Polipose Intestinal
Limite:
Humans
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Male
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Middle aged
Idioma:
En
Revista:
Mol Genet Genomic Med
Ano de publicação:
2024
Tipo de documento:
Article
País de afiliação:
Espanha