Cited by 324Genetic factors in colorectal cancerEpigenetics and DNA MethylationGenetic Syndromes and Imprinting

Heritable germline epimutation of MSH2 in a family with hereditary nonpolyposis colorectal cancer

Chan, Tsun Leung, Yuen, Siu Tsan, Kong, Chi Kwan, Chan, Yee Wai, Chan, Annie SY, Ng, Wai Fu, Tsui, Wai Yin, Lo, Michelle WS +3 more·2006·Nature Genetics

Abstract

Epimutations in the germline, such as methylation of the MLH1 gene, may contribute to hereditary cancer syndrome in human, but their transmission to offspring has never been documented. Here we report a family with inheritance, in three successive generations, of germline allele-specific and mosaic hypermethylation of the MSH2 gene, without evidence of DNA mismatch repair gene mutation. Three siblings carrying the germline methylation developed early-onset colorectal or endometrial cancers, all with microsatellite instability and MSH2 protein loss. Clonal bisulfite sequencing and pyrosequencing showed different methylation levels in different somatic tissues, with the highest level recorded in rectal mucosa and colon cancer tissue, and the lowest in blood leukocytes. This mosaic state of germline methylation with different tissue distribution could act as the first hit and provide a mechanism for genetic disease inheritance that may deviate from the mendelian pattern and be overlooked in conventional leukocyte-based genetic diagnosis strategy.

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Crossref · 10.1038/ng1866

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  • As a consequence, transcription from this gene extended into the gene under investigation, causing abnormal promoter methylation and gene silencing.

    “As a consequence, transcription from this gene extended into the gene under investigation, causing abnormal promoter methylation and gene silencing.”
  • Most cases of segregation of abnormal DNA methylation patterns in families with rare diseases turned out to be caused by an underlying genetic variant.

    “Most cases of segregation of abnormal DNA methylation patterns in families with rare diseases, however, turned out to be caused by an underlying genetic variant14–16 (see below).”
  • In these cases, the abnormal DNA methylation of the gene under investigation was linked to a mutation in a neighboring gene that removed the transcription termination signal.

    “In these cases, the abnormal DNA methylation of the gene under investigation was linked to a mutation in a neighboring gene that removed the transcription termination signal (Fig. 1b).”
  • Several studies including Guéant et al. have reported the co-segregation of an abnormal DNA methylation pattern (epimutation) with a rare disease in two or more generations of certain families.

    “Several studies14–16 including a recent study by Guéant et al.18 in this journal, have reported the co-segregation of an abnormal DNA methylation pattern (called “epimutation”) with a rare disease in two or more generations of certain families.”

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Authors
Chan, T. L., Yuen, S. T., Kong, C. K., Chan, Y. W., Chan, A. S., Ng, W. F., Tsui, W. Y., Lo, M. W., Tam, W. Y., Li, V. S., & Leung, S. Y.
Affiliations
  • Queen Mary Hospital (CN)
  • Yan Chai Hospital (HK)
Corresponding author
  • Yuen, Siu Tsan
  • Leung, Suet Yi
Venue
Nature Genetics
Published
2006-09-03
Volume
38
Issue
10
Pages
1178-1183
ISSN
  • 1061-4036 (ISSN-L)
  • 1546-1718
OpenAlex
W2013521944
Cited by
324
References
21
Citations by year
2026: 5 · 2025: 3 · 2024: 6 · 2023: 3 · 2022: 3 · 2021: 6 · 2020: 14 · 2019: 13 · 2018: 8 · 2017: 8 · 2016: 12 · 2015: 12 · 2014: 24 · 2013: 23 · 2012: 26
FWCI
22.54
Type
journal article
Language
en
Open access
closed
Locations
  • Nature Genetics (publishedVersion)
  • PubMed (publishedVersion)
  • The HKU Scholars Hub (University of Hong Kong) (submittedVersion)
Topics
  • Health Sciences › Medicine › Pathology and Forensic Medicine › Genetic factors in colorectal cancer
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Epigenetics and DNA Methylation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic Syndromes and Imprinting
Keywords
MSH2, epimutations, Lynch syndrome, microsatellite instability, endometrial cancer, DNA mismatch repair, germline mosaicism, tissue-specific methylation, non-Mendelian inheritance, MLH1 promoter methylation
MeSH terms
Adult, Colorectal Neoplasms, Hereditary Nonpolyposis, Female, Humans, Male, Pedigree, Germ-Line Mutation, DNA Methylation, MutS Homolog 2 Protein

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