Genetic Variant POLD1:p.Leu995Phe (chr19-50416639-C-T) – ACMG Classification: Likely_benign (-5 pts)

Variant summary

Our verdict is Likely benign. Variant got -5 ACMG points: 0P and 5B. BP4BS2

The NM_002691.4(POLD1):c.2983C>T(p.Leu995Phe) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000707 in 1,413,890 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 12/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: not found (cov: 34)

Exomes 𝑓: 0.0000071 ( 0 hom. )

Consequence

POLD1
NM_002691.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:5

Conservation

PhyloP100: 1.16

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:

ENSG00000142539 (HGNC:):

ENSG00000142539 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -5 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.2959532).

BS2

High AC in GnomAdExome4 at 10 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
POLD1	NM_002691.4 link	c.2983C>T	p.Leu995Phe	missense_variant	Exon 24 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.2983C>T	p.Leu995Phe	missense_variant	Exon 24 of 27	1	NM_002691.4	ENSP00000406046.1		P28340
ENSG00000142539	ENST00000599632.1 link	c.190C>T	p.Leu64Phe	missense_variant	Exon 3 of 10	5		ENSP00000473233.1		M0R3H8

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.0000174

AC:

AN:

172138

Hom.:

AF XY:

0.0000213

AC XY:

AN XY:

94026

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:

0.00

Gnomad NFE exome

AF:

0.0000275

Gnomad OTH exome

AF:

0.000214

GnomAD4 exome

AF:

0.00000707

AC:

AN:

1413890

Hom.:

Cov.:

AF XY:

0.00000571

AC XY:

AN XY:

700082

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:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000824

Gnomad4 OTH exome

AF:

0.0000170

GnomAD4 genome

Cov.:

ExAC

AF:

0.00000848

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:5

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Colorectal cancer, susceptibility to, 10;C3715192:Mandibular hypoplasia-deafness-progeroid syndrome;C5935622:Immunodeficiency 120

Uncertain:2

Jan 02, 2025

Department of Pathology and Laboratory Medicine, Sinai Health System

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Jan 02, 2024

Fulgent Genetics, Fulgent Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not provided

Uncertain:1

Sep 05, 2023

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Not observed at a 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

Nov 01, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces leucine, which is neutral and non-polar, with phenylalanine, which is neutral and non-polar, at codon 995 of the POLD1 protein (p.Leu995Phe). 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: 239326). 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

Apr 22, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.L995F variant (also known as c.2983C>T), located in coding exon 23 of the POLD1 gene, results from a C to T substitution at nucleotide position 2983. The leucine at codon 995 is replaced by phenylalanine, 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

0.26

BayesDel_addAF

Benign

-0.20

BayesDel_noAF

Benign

-0.52

CADD

Uncertain

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.46

T;.;.;T

Eigen

Benign

0.054

Eigen_PC

Benign

-0.021

FATHMM_MKL

Benign

0.44

LIST_S2

Uncertain

0.94

.;.;D;D

M_CAP

Benign

0.045

MetaRNN

Benign

0.30

T;T;T;T

MetaSVM

Benign

-1.0

MutationAssessor

Benign

1.7

L;.;.;L

PrimateAI

Pathogenic

0.89

PROVEAN

Benign

-2.1

N;.;.;.

REVEL

Benign

0.079

Sift

Uncertain

0.025

D;.;.;.

Sift4G

Benign

0.098

T;T;T;T

Polyphen

0.79

P;.;.;P

Vest4

0.51

MutPred

0.55

Loss of sheet (P = 0.0228);.;.;Loss of sheet (P = 0.0228);

MVP

0.55

MPC

1.3

ClinPred

0.26

GERP RS

2.7

Varity_R

0.29

gMVP

0.20

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