chr19-50402694-C-T
Variant summary
Our verdict is Uncertain significance. Variant got 0 ACMG points: 0P and 0B.
The NM_002691.4(POLD1):c.923C>T(p.Ala308Val) variant causes a missense change. The variant allele was found at a frequency of 0.00001 in 1,599,282 control chromosomes in the GnomAD database, with no homozygous occurrence. 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. A308T) has been classified as Uncertain significance.
Frequency
Genomes: 𝑓 0.000013 ( 0 hom., cov: 33)
Exomes 𝑓: 0.0000097 ( 0 hom. )
Consequence
POLD1
NM_002691.4 missense
NM_002691.4 missense
Scores
3
11
4
Clinical Significance
Conservation
PhyloP100: 4.34
Genes affected
POLD1 (HGNC:9175): (DNA polymerase delta 1, catalytic subunit) This gene encodes the 125-kDa catalytic subunit of DNA polymerase delta. DNA polymerase delta possesses both polymerase and 3' to 5' exonuclease activity and plays a critical role in DNA replication and repair. Alternatively spliced transcript variants have been observed for this gene, and a pseudogene of this gene is located on the long arm of chromosome 6. [provided by RefSeq, Mar 2012]
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ACMG classification
Classification made for transcript
Verdict is Uncertain_significance. Variant got 0 ACMG points.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
POLD1 | NM_002691.4 | c.923C>T | p.Ala308Val | missense_variant | 8/27 | ENST00000440232.7 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
POLD1 | ENST00000440232.7 | c.923C>T | p.Ala308Val | missense_variant | 8/27 | 1 | NM_002691.4 | P1 |
Frequencies
GnomAD3 genomes ? AF: 0.0000131 AC: 2AN: 152262Hom.: 0 Cov.: 33
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GnomAD4 exome AF: 0.00000968 AC: 14AN: 1447020Hom.: 0 Cov.: 34 AF XY: 0.0000125 AC XY: 9AN XY: 717330
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ClinVar
Significance: Uncertain significance
Submissions summary: Uncertain:2
Revision: criteria provided, multiple submitters, no conflicts
LINK: link
Submissions by phenotype
Colorectal cancer, susceptibility to, 10 Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Invitae | Dec 27, 2023 | This sequence change replaces alanine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 308 of the POLD1 protein (p.Ala308Val). 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: 408017). 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 | Dec 27, 2023 | The c.923C>T (p.A308V) alteration is located in exon 8 (coding exon 7) of the POLD1 gene. This alteration results from a C to T substitution at nucleotide position 923, causing the alanine (A) at amino acid position 308 to be replaced by a valine (V). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
AlphaMissense
Pathogenic
BayesDel_addAF
Uncertain
D
BayesDel_noAF
Uncertain
Cadd
Uncertain
Dann
Pathogenic
DEOGEN2
Uncertain
T;.;.;T
Eigen
Uncertain
Eigen_PC
Benign
FATHMM_MKL
Uncertain
D
M_CAP
Benign
D
MetaRNN
Uncertain
D;D;D;D
MetaSVM
Benign
T
MutationAssessor
Pathogenic
M;.;.;M
MutationTaster
Benign
D
PrimateAI
Uncertain
T
PROVEAN
Uncertain
D;.;.;.
REVEL
Uncertain
Sift
Uncertain
D;.;.;.
Sift4G
Uncertain
D;D;D;D
Polyphen
D;.;.;D
Vest4
MVP
MPC
ClinPred
D
GERP RS
RBP_binding_hub_radar
RBP_regulation_power_radar
Varity_R
gMVP
Splicing
Name
Calibrated prediction
Score
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SpliceAI score (max)
Details are displayed if max score is > 0.2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at