chr19-50416634-C-T
Variant summary
Our verdict is Likely benign. Variant got -3 ACMG points: 1P and 4B. PP3BS2
The NM_002691.4(POLD1):c.2978C>T(p.Thr993Met) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000083 in 1,565,678 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. T993A) has been classified as Uncertain significance.
Frequency
Consequence
NM_002691.4 missense
Scores
Clinical Significance
Conservation
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ACMG classification
Verdict is Likely_benign. Variant got -3 ACMG points.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
POLD1 | NM_002691.4 | c.2978C>T | p.Thr993Met | missense_variant | 24/27 | ENST00000440232.7 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
POLD1 | ENST00000440232.7 | c.2978C>T | p.Thr993Met | missense_variant | 24/27 | 1 | NM_002691.4 | P1 |
Frequencies
GnomAD3 genomes AF: 0.00000657 AC: 1AN: 152180Hom.: 0 Cov.: 34
GnomAD3 exomes AF: 0.0000175 AC: 3AN: 171192Hom.: 0 AF XY: 0.0000320 AC XY: 3AN XY: 93618
GnomAD4 exome AF: 0.00000849 AC: 12AN: 1413498Hom.: 0 Cov.: 35 AF XY: 0.00000714 AC XY: 5AN XY: 699876
GnomAD4 genome AF: 0.00000657 AC: 1AN: 152180Hom.: 0 Cov.: 34 AF XY: 0.0000135 AC XY: 1AN XY: 74336
ClinVar
Submissions by phenotype
not provided Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | GeneDx | Dec 22, 2022 | Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Has not been previously published as pathogenic or benign to our knowledge; This variant is associated with the following publications: (PMID: 29056344) - |
Colorectal cancer, susceptibility to, 10 Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Invitae | Jan 17, 2024 | This sequence change replaces threonine, which is neutral and polar, with methionine, which is neutral and non-polar, at codon 993 of the POLD1 protein (p.Thr993Met). The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the gnomAD database. This variant has not been reported in the literature in individuals affected with POLD1-related conditions. ClinVar contains an entry for this variant (Variation ID: 408033). 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) performed at Invitae indicates that this missense variant is not expected to disrupt POLD1 protein function with a negative predictive value of 80%. 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. - |
Hereditary cancer-predisposing syndrome Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Ambry Genetics | Jul 04, 2023 | The p.T993M variant (also known as c.2978C>T), located in coding exon 23 of the POLD1 gene, results from a C to T substitution at nucleotide position 2978. The threonine at codon 993 is replaced by methionine, an amino acid with similar properties. This amino acid position is conserved. In addition, this alteration is predicted to be tolerated by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. - |
Computational scores
Source:
Splicing
Find out detailed SpliceAI scores and Pangolin per-transcript scores at