Gene Variant Detail

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Gene MLH1
Variant I68N
Impact List missense
Protein Effect loss of function - predicted
Gene Variant Descriptions MLH1 I68N lies within the ATPase domain of the Mlh1 protein (PMID: 22753075). I68N results in decreased mismatch repair (MMR) activity in in vitro assays (PMID: 17510385, PMID: 15475387), loss of interaction with Pms2 and Exo1 in yeast two-hybrid assays and loss of repression activity in a yeast reporter assay (PMID: 12810663), and therefore, is predicted to result in a loss of Mlh1 protein function.
Associated Drug Resistance

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Transcript NM_000249.3
gDNA chr3:g.36996705T>A
cDNA c.203T>A
Protein p.I68N
Source Database RefSeq
Genome Build GRCh38/hg38
Transcript gDNA cDNA Protein Source Database Genome Build
NM_000249.3 chr3:g.36996705T>A c.203T>A p.I68N RefSeq GRCh38/hg38
NM_001354628.1 chr3:g.36996705T>A c.203T>A p.I68N RefSeq GRCh38/hg38
XM_005265161.2 chr3:g.36996705T>A c.203T>A p.I68N RefSeq GRCh38/hg38
NM_001354630.1 chr3:g.36996705T>A c.203T>A p.I68N RefSeq GRCh38/hg38
NM_001258271.1 chr3:g.36996705T>A c.203T>A p.I68N RefSeq GRCh38/hg38
NM_001354629.1 chr3:g.36996705T>A c.203T>A p.I68N RefSeq GRCh38/hg38

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Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
MLH1 inact mut colorectal cancer not applicable N/A Preclinical Emerging In a preclinical study, MLH1 inactivation through hypermethylation was associated with high microsatellite instability (MSI-H) colorectal carcinoma by whole genome sequencing of tumor samples (PMID: 22810696), suggesting it may be a potential biomarker. 22810696
MLH1 mutant endometrial carcinoma not applicable N/A Guideline Risk Factor Germline mutations in MLH1 result in Lynch syndrome, which is associated with increased risk of developing endometrial carcinoma (NCCN.org). detail...
MLH1 mutant pancreatic cancer not applicable N/A Guideline Risk Factor Germline mutations in MLH1 result in Lynch syndrome, which is associated with increased risk of developing pancreatic cancer (NCCN.org). detail...
MLH1 mutant rectum cancer not applicable N/A Guideline Risk Factor Lynch syndrome results from germline mutations in DNA mismatch repair genes including MLH1, MSH2, MSH6, and PMS2, and is associated with increased risk of developing colorectal cancer (NCCN.org). detail...
MLH1 mutant colon cancer not applicable N/A Guideline Risk Factor Lynch syndrome results from germline mutations in DNA mismatch repair genes including MLH1, MSH2, MSH6, and PMS2, and is associated with increased risk of developing colon cancer (NCCN.org). detail...
MLH1 mutant stomach cancer not applicable N/A Guideline Risk Factor Germline mutations in MLH1 result in Lynch syndrome, which is associated with increased risk of early onset of gastric cancer (NCCN.org). detail...
MLH1 mutant small intestine adenocarcinoma not applicable N/A Guideline Risk Factor Lynch syndrome results from germline mutations in DNA mismatch repair genes including MLH1, MSH2, MSH6, and PMS2, and is associated with increased risk of developing small bowel adenocarcinoma (NCCN.org). detail...
Molecular Profile Protein Effect Treatment Approaches
MLH1 I68N loss of function - predicted