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Vermaut C, Leclerc J, Vasseur F, Wacrenier A, Lovecchio T, Boidin D, Rebergue MH, Cattan S, Manouvrier S, Lejeune S, Buisine MP. MSH2 c.1022T>C, p.Leu341Pro is a founder pathogenic variation and a major cause of Lynch syndrome in the North of France. Genes Chromosomes Cancer 2019; 59:111-118. [PMID: 31433521 DOI: 10.1002/gcc.22804] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2019] [Revised: 08/16/2019] [Accepted: 08/16/2019] [Indexed: 11/10/2022] Open
Abstract
Interpretation of missense variants remains a major challenge for genetic diagnosis, even in well-known genes such as the DNA-mismatch repair (MMR) genes involved in Lynch syndrome. We report the characterization of a variant in MSH2: c.1022T>C, which was identified in 20 apparently unrelated families living in the North of France. A total of 150 patients from 20 families were included in this study. Family segregation studies, tumor analyses and functional analyses at both the RNA and protein levels were performed. Founder effect was evaluated by haplotype analysis.We show that MSH2 c.1022T>C is a missense variant (p.Leu341Pro) that affects protein stability. This variant is frequent in the North of France (7.7% of pathogenic variations identified in MMR genes), and is located on an ancestral haplotype. It is associated with a high risk of a broad tumor spectrum including brain and cutaneous cancers. The MSH2 c.1022T>C variant is a pathogenic founder variation associated with a high risk of cancer. These findings have important implications for genetic counseling and management of variant carriers.
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Affiliation(s)
- Catherine Vermaut
- Department of Biochemistry and Molecular Biology, Lille University Hospital, Lille, France
| | - Julie Leclerc
- Department of Biochemistry and Molecular Biology, Inserm UMR-S1172 - Jean-Pierre Aubert Research Center, Lille University, and Lille University Hospital, Lille, France
| | - Francis Vasseur
- Department of Biostatistics, Lille University and Lille University Hospital, Lille, France
| | - Agnes Wacrenier
- Department of Pathology, Lille University Hospital, Lille, France
| | - Tonio Lovecchio
- Department of Biochemistry and Molecular Biology, Lille University Hospital, Lille, France
| | - Denis Boidin
- Department of Biochemistry and Molecular Biology, Lille University Hospital, Lille, France
| | | | - Stephane Cattan
- Department of Gastroenterology, Lille University Hospital, Lille, France
| | - Sylvie Manouvrier
- Department of Clinical Genetics, Lille University Hospital, Lille, France.,Department of Clinical Genetics, Lille University EA 7364 - RADEME (Maladies RAres du Développement et du Métabolisme), and Lille University Hospital, Lille, France
| | - Sophie Lejeune
- Department of Clinical Genetics, Lille University Hospital, Lille, France
| | - Marie-Pierre Buisine
- Department of Biochemistry and Molecular Biology, Inserm UMR-S1172 - Jean-Pierre Aubert Research Center, Lille University, and Lille University Hospital, Lille, France
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