19-50415794-G-T

Position:

• chr19-50415794-G-T

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_002691.4(POLD1):​c.2788G>T​(p.Ala930Ser) variant causes a missense change. The variant allele was found at a frequency of 0.00000071 in 1,408,668 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. A930G) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 7.1e-7 (0 hom.)
• Consequence: POLD1 NM_002691.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 5.09

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.30741727).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
POLD1	NM_002691.4	c.2788G>T	p.Ala930Ser	missense_variant	22/27	ENST00000440232.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
POLD1	ENST00000440232.7	c.2788G>T	p.Ala930Ser	missense_variant	22/27	1	NM_002691.4	P1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome AF: 7.10e-7 AC: 1 AN: 1408668 Hom.: 0 Cov.: 33 AF XY: 0.00 AC XY: 0 AN XY: 696490

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000263

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 31

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Colorectal cancer, susceptibility to, 10 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Dec 16, 2018

This variant has not been reported in the literature in individuals with POLD1-related conditions. The frequency data for this variant in the population databases is considered unreliable, as metrics indicate insufficient coverage at this position in the ExAC database. This sequence change replaces alanine with serine at codon 930 of the POLD1 protein (p.Ala930Ser). The alanine residue is moderately conserved and there is a moderate physicochemical difference between alanine and serine. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated, but these predictions have not been confirmed by published functional studies and their clinical significance is uncertain. 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	0.085
BayesDel_addAF	Benign	-0.21	T
BayesDel_noAF	Benign	-0.55
CADD	Benign	21
DANN	Uncertain	0.99
DEOGEN2	Benign	0.14	T;.;.;T
Eigen	Benign	-0.17
Eigen_PC	Benign	-0.12
FATHMM_MKL	Pathogenic	0.98	D
M_CAP	Uncertain	0.10	D
MetaRNN	Benign	0.31	T;T;T;T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	1.0	L;.;.;L
MutationTaster	Benign	1.0	D
PrimateAI	Pathogenic	0.80	T
PROVEAN	Benign	-1.4	N;.;.;.
REVEL	Benign	0.096
Sift	Benign	0.13	T;.;.;.
Sift4G	Benign	0.24	T;T;T;T
Polyphen		0.12	B;.;.;B
Vest4		0.37
MutPred		0.57		Loss of stability (P = 0.0587);.;.;Loss of stability (P = 0.0587);
MVP		0.46
MPC		0.68
ClinPred		0.83	D
GERP RS		3.3
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.8
Varity_R		0.45
gMVP		0.25

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

Other links and lift over

dbSNP: rs144111108; hg19: chr19-50919051;