Xavier A, Olsen MF, Lavik LA, Johansen J, Singh AK, Sjursen W, Scott RJ, Talseth‐Palmer BA. Comprehensive mismatch repair gene panel identifies variants in patients with Lynch-like syndrome.
Mol Genet Genomic Med 2019;
7:e850. [PMID:
31297992 PMCID:
PMC6687620 DOI:
10.1002/mgg3.850]
[Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2019] [Revised: 06/18/2019] [Accepted: 06/24/2019] [Indexed: 12/14/2022] Open
Abstract
Background
Lynch‐like syndrome (LLS) represents around 50% of the patients fulfilling the Amsterdam Criteria II/revised Bethesda Guidelines, characterized by a strong family history of Lynch Syndrome (LS) associated cancer, where a causative variant was not identified during genetic testing for LS.
Methods
Using data extracted from a larger gene panel, we have analyzed next‐generation sequencing data from 22 mismatch repair (MMR) genes (MSH3, PMS1, MLH3, EXO1, POLD1, POLD3 RFC1, RFC2, RFC3, RFC4, RFC5, PCNA, LIG1, RPA1, RPA2, RPA3, POLD2, POLD4, MLH1, MSH2, MSH6, and PMS2) in 274 LLS patients. Detected variants were annotated and filtered using ANNOVAR and FILTUS software.
Results
Thirteen variants were revealed in MLH1, MSH2, and MSH6, all genes previously linked to LS. Five additional genes (EXO1, POLD1, RFC1, RPA1, and MLH3) were found to harbor 11 variants of unknown significance in our sample cohort, two of them being frameshift variants.
Conclusion
We have shown that other genes associated with the process of DNA MMR have a high probability of being associated with LLS families. These findings indicate that the spectrum of genes that should be tested when considering an entity like Lynch‐like syndrome should be expanded so that a more inclusive definition of this entity can be developed.
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