rs780138978

Variant names:

Variant summary

Our verdict is Likely benign. Variant got -4 ACMG points: 0P and 4B. BS2

The NM_002691.4(POLD1):c.2326C>T(p.Arg776Trp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000602 in 1,612,006 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.000066 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000060 ( 0 hom. )

Consequence

POLD1
NM_002691.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:5B:1

Conservation

PhyloP100: 3.58

Variant links:

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]

POLD1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -4 ACMG points.

BS2

High AC in GnomAd4 at 10 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
POLD1	NM_002691.4 link	c.2326C>T	p.Arg776Trp	missense_variant	Exon 19 of 27	ENST00000440232.7	NP_002682.2	P28340A0A024R4F4Q59FA0

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
POLD1	ENST00000440232.7 link	c.2326C>T	p.Arg776Trp	missense_variant	Exon 19 of 27	1	NM_002691.4	ENSP00000406046.1		P28340

Frequencies

GnomAD3 genomes

AF:

0.0000657

AC:

AN:

152226

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.000282

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000882

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000763

AC:

AN:

248910

Hom.:

AF XY:

0.0000668

AC XY:

AN XY:

134630

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000292

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000328

Gnomad FIN exome

AF:

0.0000477

Gnomad NFE exome

AF:

0.000142

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000596

AC:

AN:

1459780

Hom.:

Cov.:

AF XY:

0.0000661

AC XY:

AN XY:

726198

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.0000225

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000348

Gnomad4 FIN exome

AF:

0.0000571

Gnomad4 NFE exome

AF:

0.0000666

Gnomad4 OTH exome

AF:

0.0000829

GnomAD4 genome

AF:

0.0000657

AC:

AN:

152226

Hom.:

Cov.:

AF XY:

0.0000538

AC XY:

AN XY:

74374

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.000282

Gnomad4 NFE

AF:

0.0000882

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000608

Hom.:

Bravo

AF:

0.0000453

ExAC

AF:

0.0000659

AC:

EpiCase

AF:

0.00

EpiControl

AF:

0.000119

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:5Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Hereditary cancer-predisposing syndrome

Uncertain:2

Uncertain significance, no assertion criteria provided	clinical testing	True Health Diagnostics	Aug 14, 2017	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Ambry Genetics	Dec 10, 2024	The p.R776W variant (also known as c.2326C>T), located in coding exon 18 of the POLD1 gene, results from a C to T substitution at nucleotide position 2326. The arginine at codon 776 is replaced by tryptophan, an amino acid with dissimilar properties. This amino acid position is highly conserved in available vertebrate species. In addition, this alteration is predicted to be tolerated by in silico analysis. Based on the available evidence, the clinical significance of this variant remains unclear. -

not specified

Uncertain:1Benign:1

Likely benign, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Jun 20, 2019	Variant summary: POLD1 c.2326C>T (p.Arg776Trp) results in a non-conservative amino acid change located in the DNA-directed DNA polymerase, family B, multifunctional domain of the encoded protein sequence. Three of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 7.6e-05 in 248910 control chromosomes. The observed variant frequency is approximately 5.37 fold of the estimated maximal expected allele frequency for a pathogenic variant in POLD1 causing Colorectal Cancer phenotype (1.4e-05), strongly suggesting that the variant is benign. c.2326C>T has been reported in the literature in individuals control individual(s) (Arora_2015) and in breast tumor tissue (Doisy_2018). These report(s) do not provide unequivocal conclusions about association of the variant with Colorectal Cancer. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. Four ClinVar submissions from clinical diagnostic laboratories (evaluation after 2014) cite the variant as uncertain significance. Based on the evidence outlined above, the variant was classified as likely benign. -
Uncertain significance, criteria provided, single submitter	clinical testing	Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine	Nov 15, 2016	The p.Arg776Trp variant in POLD1 has not been previously reported in individuals with colorectal cancer but has been identified in 1/6594 of Finnish chromosomes by the Exome Aggregation Consortium (ExAC, http://exac.broadinstitute.org; dbSN P rs780138978). Computational prediction tools and conservation analysis do not provide strong support for or against an impact to the protein. In summary, the clinical significance of the p.Arg776Trp variant is uncertain. -

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Feb 07, 2025

In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Observed in a control individual reporting no personal or family history of colorectal cancer (PMID: 26344056); This variant is associated with the following publications: (PMID: 29917049, 31422818, 20951805, 26344056) -

Colorectal cancer, susceptibility to, 10

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 29, 2025

This sequence change replaces arginine, which is basic and polar, with tryptophan, which is neutral and slightly polar, at codon 776 of the POLD1 protein (p.Arg776Trp). This variant is present in population databases (rs780138978, gnomAD 0.01%). 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: 239284). Invitae Evidence Modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) 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. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.19

BayesDel_addAF

Benign

-0.20

BayesDel_noAF

Benign

-0.28

CADD

Pathogenic

DANN

Pathogenic

1.0

DEOGEN2

Uncertain

0.43

T;.;.;T

Eigen

Pathogenic

0.81

Eigen_PC

Pathogenic

0.68

FATHMM_MKL

Uncertain

0.80

LIST_S2

Pathogenic

1.0

.;.;D;D

M_CAP

Uncertain

0.17

MetaRNN

Uncertain

0.70

D;D;D;D

MetaSVM

Benign

-0.59

MutationAssessor

Pathogenic

4.3

H;.;.;H

PrimateAI

Pathogenic

0.79

PROVEAN

Pathogenic

-6.7

D;.;.;.

REVEL

Benign

0.19

Sift

Uncertain

0.0010

D;.;.;.

Sift4G

Uncertain

0.0020

D;D;D;D

Polyphen

1.0

D;.;.;D

Vest4

0.64

MVP

0.72

MPC

1.6

ClinPred

0.97

GERP RS

5.0

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.8

Varity_R

0.60

gMVP

0.77

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.0

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over