chr3-37040269-T-C
Variant summary
Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM1PP3_Moderate
The NM_000249.4(MLH1):c.1642T>C(p.Tyr548His) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000496 in 1,613,724 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. Y548C) has been classified as Uncertain significance.
Frequency
Consequence
NM_000249.4 missense
Scores
Clinical Significance
Conservation
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ACMG classification
Verdict is Uncertain_significance. Variant got 4 ACMG points.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
MLH1 | NM_000249.4 | c.1642T>C | p.Tyr548His | missense_variant | 14/19 | ENST00000231790.8 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
MLH1 | ENST00000231790.8 | c.1642T>C | p.Tyr548His | missense_variant | 14/19 | 1 | NM_000249.4 | P1 |
Frequencies
GnomAD3 genomes ? AF: 0.0000197 AC: 3AN: 152178Hom.: 0 Cov.: 32
GnomAD3 exomes AF: 0.00000398 AC: 1AN: 251268Hom.: 0 AF XY: 0.00000736 AC XY: 1AN XY: 135790
GnomAD4 exome AF: 0.00000342 AC: 5AN: 1461546Hom.: 0 Cov.: 30 AF XY: 0.00000413 AC XY: 3AN XY: 727086
GnomAD4 genome ? AF: 0.0000197 AC: 3AN: 152178Hom.: 0 Cov.: 32 AF XY: 0.0000269 AC XY: 2AN XY: 74362
ClinVar
Submissions by phenotype
Hereditary cancer-predisposing syndrome Uncertain:3
Uncertain significance, criteria provided, single submitter | clinical testing | Ambry Genetics | Jul 14, 2020 | The p.Y548H variant (also known as c.1642T>C), located in coding exon 14 of the MLH1 gene, results from a T to C substitution at nucleotide position 1642. The tyrosine at codon 548 is replaced by histidine, an amino acid with similar properties. This amino acid position is highly conserved in available vertebrate species. In addition, this alteration is predicted to be deleterious by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. - |
Uncertain significance, criteria provided, single submitter | curation | Sema4, Sema4 | Dec 05, 2021 | - - |
Uncertain significance, criteria provided, single submitter | clinical testing | Color Diagnostics, LLC DBA Color Health | May 05, 2023 | This missense variant replaces tyrosine with histidine at codon 548 of the MLH1 protein. Computational prediction suggests that this variant may have deleterious impact on protein structure and function (internally defined REVEL score threshold >= 0.7, PMID: 27666373). To our knowledge, functional studies have not been reported for this variant. This variant has not been reported in individuals affected with MLH1-related disorders in the literature. This variant has been identified in 1/251268 chromosomes in the general population by the Genome Aggregation Database (gnomAD). The available evidence is insufficient to determine the role of this variant in disease conclusively. Therefore, this variant is classified as a Variant of Uncertain Significance. - |
Breast and/or ovarian cancer Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | CHEO Genetics Diagnostic Laboratory, Children's Hospital of Eastern Ontario | Nov 21, 2022 | - - |
Lynch syndrome Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | All of Us Research Program, National Institutes of Health | May 16, 2023 | This missense variant replaces tyrosine with histidine at codon 548 of the MLH1 protein. Computational prediction tool suggests that this variant may have deleterious impact on protein structure and function (internally defined REVEL score threshold >= 0.7, PMID: 27666373). Splice site prediction tools suggest that this variant may not impact RNA splicing. To our knowledge, functional studies have not been performed for this variant. This variant has not been reported in individuals affected with hereditary cancer in the literature. This variant has been identified in 1/251268 chromosomes in the general population by the Genome Aggregation Database (gnomAD). The available evidence is insufficient to determine the role of this variant in disease conclusively. Therefore, this variant is classified as a Variant of Uncertain Significance. - |
Hereditary nonpolyposis colorectal neoplasms Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Invitae | Dec 18, 2023 | This sequence change replaces tyrosine, which is neutral and polar, with histidine, which is basic and polar, at codon 548 of the MLH1 protein (p.Tyr548His). This variant is present in population databases (rs780317287, gnomAD 0.0009%). This variant has not been reported in the literature in individuals affected with MLH1-related conditions. ClinVar contains an entry for this variant (Variation ID: 187383). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on MLH1 protein function. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. - |
Computational scores
Source:
Splicing
Find out detailed SpliceAI scores and Pangolin per-transcript scores at