Genetic Factors in Colorectal Cancer Syndromes

Hereditary colorectal cancer syndromes arise from germline alterations that markedly elevate lifetime risk through disruption of key pathways in DNA repair and cellular growth control. Lynch syndrome, the most common inherited form, results from pathogenic variants in DNA mismatch repair genes (MLH1, MSH2, MSH6, PMS2) or deletions in adjacent regulatory loci, leading to microsatellite instability and accelerated tumourigenesis. Familial adenomatous polyposis stems from truncating mutations in the APC gene, whereas MUTYH-associated polyposis follows a recessive pattern of base excision repair failure. More recently, polymerase proofreading–associated polyposis due to POLE/POLD1 variants and defects in homologous recombination genes (including ATM, BARD1 and RAD50) have been recognised as contributors to early-onset or extra-colonic phenotypes. The genetic architecture of inherited colorectal cancer encompasses rare high-penetrance alleles, moderate-risk variants and the emerging potential of polygenic risk scores to refine individual risk estimates. Population-specific founder mutations further shape prevalence and inform tailored screening. Advances in next-generation sequencing, tumour-based assays and integrative variant interpretation are transforming predictive testing, surveillance protocols and precision therapy for affected families worldwide.

Research from Nature Portfolio

Comprehensive exome analyses of early-onset familial colorectal cancer cases and controls have quantified the impact of rare disruptive germline variants, demonstrating that high-penetrance mutations account for a substantial fraction of familial risk while ruling out additional major susceptibility genes that would individually explain over 1% of inherited burden. These studies have nominated novel candidates—such as POT1, POLE2 and MRE11—and provided a resource for contextualising emerging gene discoveries. A population-wide whole-genome sequencing effort in a homogenous cohort identified the prevalence of Lynch syndrome, uncovered founder mutations in MSH6 and PMS2, and refined the clinical significance of variants of uncertain effect. These findings have enabled more accurate carrier frequency estimates and underscore the value of integrating large-scale genomic and registry data for national screening strategies.

Genetic Factors in Colorectal Cancer Syndromes publication trend

The graph below shows the total number of articles in genetic factors in colorectal cancer syndromes across all publications each year (not limited to Nature Index journals).

Technical terms

Germline mutation: A heritable DNA alteration present in all cells that predisposes to cancer when occurring in specific susceptibility genes.

DNA mismatch repair (MMR): A cellular pathway that corrects replication errors; defects lead to microsatellite instability and tumour development.

Microsatellite instability (MSI): A molecular phenotype characterised by length variations in short tandem repeats, indicative of MMR deficiency.

Homologous recombination (HR): A high-fidelity mechanism for repairing double-strand DNA breaks; germline defects increase cancer susceptibility.

Founder mutation: A pathogenic variant observed at elevated frequency in a population due to descent from a common ancestor.

References

1. Lynch Syndrome Genetics and Clinical Implications. Gastroenterology (2023).
2. The Largest Chinese Cohort Study Indicates Homologous Recombination Pathway Gene Mutations as Another Major Genetic Risk Factor for Colorectal Cancer with Heterogeneous Clinical Phenotypes. Research (2023).
3. A tumor focused approach to resolving the etiology of DNA mismatch repair deficient tumors classified as suspected Lynch syndrome. Journal of Translational Medicine (2023).
4. Rare disruptive mutations and their contribution to the heritable risk of colorectal cancer. Nature Communications (2016).
5. Comprehensive population-wide analysis of Lynch syndrome in Iceland reveals founder mutations in MSH6 and PMS2. Nature Communications (2017).
6. Germline deletions in the EPCAM gene as a cause of Lynch syndrome – literature review. Hereditary Cancer in Clinical Practice (2013).