rs142223599

Positions:

• chr19-50417924-C-A
• chr19-50417924-C-G
• chr19-50417924-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_002691.4(POLD1):​c.3301C>A​(p.Pro1101Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000275 in 1,456,942 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 Uncertain significance (★★).

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 0.0000027 (0 hom.)
• Consequence: POLD1 NM_002691.4 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 1.09

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 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.1642974).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
POLD1	NM_002691.4	c.3301C>A	p.Pro1101Thr	missense_variant	27/27	ENST00000440232.7	NP_002682.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
POLD1	ENST00000440232.7	c.3301C>A	p.Pro1101Thr	missense_variant	27/27	1	NM_002691.4	ENSP00000406046	P1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD3 exomes AF: 0.00000415 AC: 1 AN: 241074 Hom.: 0 AF XY: 0.00000762 AC XY: 1 AN XY: 131156

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: 0.00000923

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000275 AC: 4 AN: 1456942 Hom.: 0 Cov.: 31 AF XY: 0.00000276 AC XY: 2 AN XY: 724554

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: 0.00000361

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 31

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Colorectal cancer, susceptibility to, 10 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Apr 11, 2021

This variant has not been reported in the literature in individuals with POLD1-related conditions. This variant is not present in population databases (ExAC no frequency). This sequence change replaces proline with threonine at codon 1101 of the POLD1 protein (p.Pro1101Thr). The proline residue is weakly conserved and there is a small physicochemical difference between proline and threonine. 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. -

Hereditary cancer-predisposing syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Aug 02, 2021

The p.P1101T variant (also known as c.3301C>A), located in coding exon 26 of the POLD1 gene, results from a C to A substitution at nucleotide position 3301. The proline at codon 1101 is replaced by threonine, 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	0.069
BayesDel_addAF	Benign	-0.17	T
BayesDel_noAF	Benign	-0.48
CADD	Benign	17
DANN	Benign	0.88
DEOGEN2	Benign	0.14	T;.;.;T
Eigen	Benign	-0.63
Eigen_PC	Benign	-0.56
FATHMM_MKL	Benign	0.67	D
LIST_S2	Benign	0.78	.;.;T;T
M_CAP	Uncertain	0.15	D
MetaRNN	Benign	0.16	T;T;T;T
MetaSVM	Benign	-0.84	T
MutationAssessor	Benign	1.2	L;.;.;L
MutationTaster	Benign	0.90	D
PrimateAI	Uncertain	0.67	T
PROVEAN	Benign	-0.19	N;.;.;.
REVEL	Benign	0.077
Sift	Benign	0.47	T;.;.;.
Sift4G	Benign	0.64	T;T;T;T
Polyphen		0.044	B;.;.;B
Vest4		0.45
MutPred		0.26		Gain of phosphorylation at P1101 (P = 0.0092);.;.;Gain of phosphorylation at P1101 (P = 0.0092);
MVP		0.49
MPC		0.78
ClinPred		0.083	T
GERP RS		2.8
RBP_binding_hub_radar		1.1
RBP_regulation_power_radar		2.8
Varity_R		0.15
gMVP		0.27

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.030		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: rs142223599; hg19: chr19-50921181;