NM_002691.4:c.590G>A

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 0P and 2B. BP4_Moderate

The NM_002691.4(POLD1):c.590G>A(p.Ser197Asn) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000505 in 1,583,858 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 17/24 in silico tools predict a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. 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. S197R) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 33)

Exomes 𝑓: 0.0000049 ( 0 hom. )

Consequence

POLD1
NM_002691.4 missense, splice_region

Scores

Splicing: ADA: 0.01254

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:3

Conservation

PhyloP100: 1.40

Publications

0 publications found

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 Gene-Disease associations (from GenCC):

POLD1-related polyposis and colorectal cancer syndrome
Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
colorectal cancer, susceptibility to, 10
Inheritance: AD Classification: STRONG, MODERATE Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, Genomics England PanelApp
mandibular hypoplasia-deafness-progeroid syndrome
Inheritance: AD, AR Classification: STRONG, SUPPORTIVE, LIMITED Submitted by: Labcorp Genetics (formerly Invitae), PanelApp Australia, Genomics England PanelApp, Ambry Genetics, Orphanet, G2P
Polymerase proofreading-related adenomatous polyposis
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
immunodeficiency 120
Inheritance: AR Classification: LIMITED Submitted by: Ambry Genetics
non-severe combined immunodeficiency due to polymerase delta deficiency
Inheritance: AR Classification: LIMITED Submitted by: ClinGen

POLD1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -2 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.14679989).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
POLD1	NM_002691.4 link	c.590G>A	p.Ser197Asn	missense_variant, splice_region_variant	Exon 6 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.590G>A	p.Ser197Asn	missense_variant, splice_region_variant	Exon 6 of 27	1	NM_002691.4	ENSP00000406046.1		P28340

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152188

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:

0.000207

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000177

AC:

AN:

226292

AF XY:

0.0000330

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 FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000489

AC:

AN:

1431670

Hom.:

Cov.:

AF XY:

0.00000847

AC XY:

AN XY:

708472

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

32942

American (AMR)

AF:

0.00

AC:

AN:

42300

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

23776

East Asian (EAS)

AF:

0.00

AC:

AN:

39408

South Asian (SAS)

AF:

0.0000867

AC:

AN:

80742

European-Finnish (FIN)

AF:

0.00

AC:

AN:

52220

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5614

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1095628

Other (OTH)

AF:

0.00

AC:

AN:

59040

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.468

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152188

Hom.:

Cov.:

AF XY:

0.0000134

AC XY:

AN XY:

74362

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41450

American (AMR)

AF:

0.00

AC:

AN:

15278

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5190

South Asian (SAS)

AF:

0.000207

AC:

AN:

4836

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10624

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

68020

Other (OTH)

AF:

0.00

AC:

AN:

2090

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.425

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.00

Hom.:

ExAC

AF:

0.0000165

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Uncertain:1

Sep 28, 2022

GeneDx

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Not observed at significant frequency in large population cohorts (gnomAD); 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:1

May 18, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces serine, which is neutral and polar, with asparagine, which is neutral and polar, at codon 197 of the POLD1 protein (p.Ser197Asn). This variant is present in population databases (rs780144670, gnomAD 0.02%). 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: 537119). 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. -

Hereditary cancer-predisposing syndrome

Uncertain:1

Jul 27, 2023

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The p.S197N variant (also known as c.590G>A) is located in coding exon 5 of the POLD1 gene. The serine at codon 197 is replaced by asparagine, an amino acid with highly similar properties. This change occurs in the first base pair of coding exon 5. 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

0.21

BayesDel_addAF

Benign

-0.50

BayesDel_noAF

Benign

-0.70

CADD

Benign

(source)

DANN

Benign

0.85

DEOGEN2

Benign

0.11

T;.;.;T

Eigen

Benign

-0.33

Eigen_PC

Benign

-0.24

FATHMM_MKL

Uncertain

0.84

LIST_S2

Benign

0.74

.;.;T;T

M_CAP

Benign

0.017

MetaRNN

Benign

0.15

T;T;T;T

MetaSVM

Benign

-1.1

MutationAssessor

Benign

0.17

N;.;.;N

PhyloP100

1.4

PrimateAI

Uncertain

0.63

PROVEAN

Benign

0.26

N;.;.;.

REVEL

Benign

0.096

Sift

Benign

0.58

T;.;.;.

Sift4G

Benign

0.53

T;T;T;T

Polyphen

0.020

B;.;.;B

Vest4

0.27

MutPred

0.57

Loss of phosphorylation at S197 (P = 0.0561);Loss of phosphorylation at S197 (P = 0.0561);Loss of phosphorylation at S197 (P = 0.0561);Loss of phosphorylation at S197 (P = 0.0561);

MVP

0.49

MPC

0.18

ClinPred

0.065

GERP RS

2.9

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.064

gMVP

0.53

Mutation Taster

=67/33

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Benign

0.013

dbscSNV1_RF

Benign

0.22

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over