rs778275831

Positions:

Variant summary

Our verdict is Benign. Variant got -8 ACMG points: 0P and 8B. BP4_StrongBS2

The ENST00000440232.7(POLD1):c.17G>A(p.Arg6Gln) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000547 in 1,608,276 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R6P) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.000059 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000054 ( 0 hom. )

Consequence

POLD1
ENST00000440232.7 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:7B:1

Conservation

PhyloP100: 0.288

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 Benign. Variant got -8 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.05849752).

BS2

High AC in GnomAd4 at 9 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
POLD1	NM_002691.4 linkuse as main transcript	c.17G>A	p.Arg6Gln	missense_variant	2/27	ENST00000440232.7	NP_002682.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
POLD1	ENST00000440232.7 linkuse as main transcript	c.17G>A	p.Arg6Gln	missense_variant	2/27	1	NM_002691.4	ENSP00000406046	P1

Frequencies

GnomAD3 genomes

AF:

0.0000591

AC:

AN:

152230

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:

0.000385

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000103

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000421

AC:

AN:

237474

Hom.:

AF XY:

0.0000464

AC XY:

AN XY:

129396

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.0000488

Gnomad NFE exome

AF:

0.0000843

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000543

AC:

AN:

1456046

Hom.:

Cov.:

AF XY:

0.0000552

AC XY:

AN XY:

723992

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000234

Gnomad4 FIN exome

AF:

0.0000190

Gnomad4 NFE exome

AF:

0.0000630

Gnomad4 OTH exome

AF:

0.000100

GnomAD4 genome

AF:

0.0000591

AC:

AN:

152230

Hom.:

Cov.:

AF XY:

0.0000538

AC XY:

AN XY:

74370

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.000385

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000103

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000530

Hom.:

Bravo

AF:

0.0000378

ExAC

AF:

0.0000991

AC:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:7Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Quest Diagnostics Nichols Institute San Juan Capistrano	Dec 13, 2018	- -
Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	Jun 04, 2023	In silico analysis supports that this missense variant does not alter protein structure/function; Has not been previously published as pathogenic or benign to our knowledge -

Colorectal cancer, susceptibility to, 10

Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 22, 2024	This sequence change replaces arginine, which is basic and polar, with glutamine, which is neutral and polar, at codon 6 of the POLD1 protein (p.Arg6Gln). This variant is present in population databases (rs778275831, gnomAD 0.009%). This missense change has been observed in individual(s) with unspecified cancer (PMID: 34326862). ClinVar contains an entry for this variant (Variation ID: 226047). Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Not Available"; PolyPhen-2: "Not Available"; Align-GVGD: "Not Available". The glutamine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect 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. -
Uncertain significance, criteria provided, single submitter	clinical testing	Counsyl	Jul 31, 2016	- -

not specified

Uncertain:1Benign:1

Likely benign, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	May 18, 2018	Variant summary: POLD1 c.17G>A (p.Arg6Gln) results in a conservative amino acid change located in the outside of any known functional domain of the encoded protein sequence. Five of five in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 0.00014 in 79494 control chromosomes, predominantly at a frequency of 0.00025 within the Non-Finnish European subpopulation in the ExAC database. The observed variant frequency within Non-Finnish European control individuals in the ExAC database is approximately 18 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 a benign polymorphism found primarily in populations of Non-Finnish European origin. To our knowledge, no occurrence of c.17G>A in individuals affected with Colorectal Cancer and no experimental evidence demonstrating its impact on protein function have been reported. Four clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation. All laboratories classified 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	Center for Genomic Medicine, Rigshospitalet, Copenhagen University Hospital	Aug 15, 2023	- -

Colorectal cancer

Uncertain:1

Uncertain significance, criteria provided, single submitter

research

CSER _CC_NCGL, University of Washington

Mar 11, 2015

- -

Hereditary cancer-predisposing syndrome

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jun 23, 2015

The p.R6Q variant (also known as c.17G>A), located in coding exon 1 of the POLD1 gene, results from a G to A substitution at nucleotide position 17. The arginine at codon 6 is replaced by glutamine, an amino acid with highly similar properties. This variant was not reported in population based cohorts in the following databases: Database of Single Nucleotide Polymorphisms (dbSNP), NHLBI Exome Sequencing Project (ESP), and 1000 Genomes Project. In the ESP, this variant was not observed in 6475 samples (12950 alleles) with coverage at this position. This amino acid position is not well conserved on limited sequence alignment. In addition, this alteration is predicted to be benign yet deleterious by PolyPhen and SIFT in silico analyses, respectively. Since supporting evidence is limited at this time, the clinical significance of p.R6Q remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.10

BayesDel_addAF

Benign

-0.41

BayesDel_noAF

Benign

-0.64

CADD

Benign

DANN

Uncertain

1.0

DEOGEN2

Benign

0.28

T;.;.;.;T;.

Eigen

Benign

-0.63

Eigen_PC

Benign

-0.65

FATHMM_MKL

Benign

0.045

LIST_S2

Benign

0.79

.;.;T;T;T;T

M_CAP

Benign

0.0082

MetaRNN

Benign

0.058

T;T;T;T;T;T

MetaSVM

Benign

-1.0

MutationAssessor

Benign

0.55

N;.;.;.;N;.

MutationTaster

Benign

1.0

PrimateAI

Uncertain

0.63

PROVEAN

Benign

-0.94

N;.;.;.;.;.

REVEL

Benign

0.099

Sift

Benign

0.063

T;.;.;.;.;.

Sift4G

Benign

0.13

T;T;D;T;T;D

Polyphen

0.0010

B;.;.;.;B;.

Vest4

0.13

MutPred

0.26

Gain of ubiquitination at K4 (P = 0.0138);Gain of ubiquitination at K4 (P = 0.0138);Gain of ubiquitination at K4 (P = 0.0138);Gain of ubiquitination at K4 (P = 0.0138);Gain of ubiquitination at K4 (P = 0.0138);Gain of ubiquitination at K4 (P = 0.0138);

MVP

0.24

MPC

0.22

ClinPred

0.098

GERP RS

0.95

RBP_binding_hub_radar

0.97

RBP_regulation_power_radar

3.2

Varity_R

0.041

gMVP

0.58

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