rs371628260

Variant summary

Our verdict is Likely benign. Variant got -1 ACMG points: 0P and 1B. BP4

The NM_002691.4(POLD1):c.2933G>A(p.Arg978His) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000902 in 1,552,484 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign 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. R978C) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000093 ( 0 hom. )

Consequence

POLD1
NM_002691.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:4

Conservation

PhyloP100: 3.29

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 -1 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.28819132).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
POLD1	NM_002691.4 linkuse as main transcript	c.2933G>A	p.Arg978His	missense_variant	23/27	ENST00000440232.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
POLD1	ENST00000440232.7 linkuse as main transcript	c.2933G>A	p.Arg978His	missense_variant	23/27	1	NM_002691.4	P1

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152240

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

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:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD4 exome

AF:

0.00000928

AC:

AN:

1400244

Hom.:

Cov.:

AF XY:

0.00000723

AC XY:

AN XY:

691260

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000276

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000126

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000832

Gnomad4 OTH exome

AF:

0.0000344

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152240

Hom.:

Cov.:

AF XY:

0.0000134

AC XY:

AN XY:

74376

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000712

Hom.:

Bravo

AF:

0.0000151

ESP6500AA

AF:

0.000233

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.0000178

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:4

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Colorectal cancer, susceptibility to, 10

Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Invitae	Jan 16, 2024	This sequence change replaces arginine, which is basic and polar, with histidine, which is basic and polar, at codon 978 of the POLD1 protein (p.Arg978His). 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: 239319). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant¬†is likely to be tolerated. 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. -
Uncertain significance, criteria provided, single submitter	clinical testing	St. Jude Molecular Pathology, St. Jude Children's Research Hospital	Aug 05, 2021	The POLD1 c.2933G>A (p.Arg978His) missense change has a maximum subpopulation frequency of 0.0043% in gnomAD v2.1.1, however this data may be unreliable due to poor data quality at this location (https://gnomad.broadinstitute.org/variant/19-50919765-G-A). In silico tools are not in agreement about the effect of this variant on protein function, but to our knowledge these predictions have not been confirmed by functional assays. This variant has been reported in a tumor with low tumor mutational burden (PMID: 29056344). To our knowledge, this variant has not been reported in the literature in individuals with POLD1-related disease. In summary, this variant meets criteria to be classified as of uncertain significance based on the ACMG/AMP criteria: no criteria met. -

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Mar 05, 2020

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 -

Hereditary cancer-predisposing syndrome

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Nov 09, 2023

The p.R978H variant (also known as c.2933G>A), located in coding exon 22 of the POLD1 gene, results from a G to A substitution at nucleotide position 2933. The arginine at codon 978 is replaced by histidine, an amino acid with highly 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: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.14

BayesDel_addAF

Benign

-0.17

BayesDel_noAF

Benign

-0.48

Cadd

Pathogenic

Dann

Uncertain

1.0

DEOGEN2

Uncertain

0.66

D;.;.;D

Eigen

Uncertain

0.21

Eigen_PC

Benign

0.18

FATHMM_MKL

Benign

0.58

M_CAP

Pathogenic

0.34

MetaRNN

Benign

0.29

T;T;T;T

MetaSVM

Benign

-0.64

MutationAssessor

Uncertain

2.6

M;.;.;M

MutationTaster

Benign

0.98

PrimateAI

Pathogenic

0.80

PROVEAN

Uncertain

-2.9

D;.;.;.

REVEL

Benign

0.064

Sift

Uncertain

0.0010

D;.;.;.

Sift4G

Uncertain

0.0050

D;D;D;D

Polyphen

0.98

D;.;.;D

Vest4

0.20

MVP

0.61

MPC

0.87

ClinPred

0.94

GERP RS

2.9

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.2

Varity_R

0.30

gMVP

0.28

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

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