Henriette Poaty, MD1,2 Lauria Batamba Bouya1 Aimé Lumaka3,4 Arnaud Mongo-Onkouo1,5 Deby Gassaye1,5
Address for correspondence Henriette Poaty, MD, Embryology and Genetic Laboratory, Faculty of Health Sciences, Marien Ngouabi University, BP 2672, Brazzaville, Republic of Congo
(e-mail: henriettepoaty@gmail.com).
Abstract
Background Lynch syndrome (LS) is an autosomal dominant condition due to the germline mutation in the mismatch repair (MMR) genes including MLH1, MSH2, MSH6, and PMS2 (post-meiotic segregation increased 2). TheMMRmutation carriers have high risk for cancers. Pathogenic PMS2 variants are rarely reported in LS-associated colorectal cancer (CRC) with colorectal polyps. The aim of the study was to investigate the genetic etiology of CRC in an individual with CRC with multiple colorectal polyps and a family history of cancers.
Patients and Methods The index patient was an African male affected by CRC with multiple colorectal polyps. The clinical diagnostic for LS was based on the Amsterdam II criteria and pedigree. Next-generation sequencing with inherited cancer genes panel was used to detect the pathogenic variant.
Results The patient fulfilled the Amsterdam II criteria and the pedigree revealed a family history of recurrent CRC. A deleterious PMS2 germline heterozygous mutation c.2192_2196delTAACT was detected.
Conclusion Our study supports the notion that LSmay be associated with polyps and shows the predisposition of PMS2 heterozygous mutation in LS-associated CRC at young age.
Keywords
► lynch syndrome
► PMS2 deficiency
► mismatch repair gene
► colorectal cancer
DOI https://doi.org/10.1055/s-0042-1759888.
ISSN 2699-9404.
Global Medical Genetics Vol. 10 No. 1/2023 © 2023. The Author(s).