19-50402216-T-C

Position:

• chr19-50402216-T-C

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_002691.4(POLD1):​c.601T>C​(p.Tyr201His) variant causes a missense change. The variant allele was found at a frequency of 0.0000014 in 1,431,988 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: POLD1 NM_002691.4 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:4
• Conservation: PhyloP100: 4.32

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 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.913

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
POLD1	NM_002691.4	c.601T>C	p.Tyr201His	missense_variant	6/27	ENST00000440232.7	NP_002682.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
POLD1	ENST00000440232.7	c.601T>C	p.Tyr201His	missense_variant	6/27	1	NM_002691.4	ENSP00000406046.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000140 AC: 2 AN: 1431988 Hom.: 0 Cov.: 34 AF XY: 0.00 AC XY: 0 AN XY: 708792

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: 0.00000182

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

Bravo AF: 0.0000151

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:4

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Quest Diagnostics Nichols Institute San Juan Capistrano	Sep 27, 2018	- -
Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	Sep 27, 2023	Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Has not been previously published as germline pathogenic or benign to our knowledge; This variant is associated with the following publications: (PMID: 29056344) -

Colorectal cancer, susceptibility to, 10 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 24, 2024

This sequence change replaces tyrosine, which is neutral and polar, with histidine, which is basic and polar, at codon 201 of the POLD1 protein (p.Tyr201His). This variant is not present in population databases (gnomAD no frequency). 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: 239359). 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) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on POLD1 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. -

Hereditary cancer-predisposing syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Nov 11, 2022

The p.Y201H variant (also known as c.601T>C), located in coding exon 5 of the POLD1 gene, results from a T to C substitution at nucleotide position 601. The tyrosine at codon 201 is replaced by histidine, an amino acid with 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	Pathogenic	0.86
BayesDel_addAF	Uncertain	0.019	T
BayesDel_noAF	Benign	-0.21
CADD	Pathogenic	26
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.59	D;.;.;D
Eigen	Pathogenic	0.68
Eigen_PC	Uncertain	0.56
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.89	.;.;D;D
M_CAP	Uncertain	0.14	D
MetaRNN	Pathogenic	0.91	D;D;D;D
MetaSVM	Benign	-0.45	T
MutationAssessor	Pathogenic	3.5	M;.;.;M
PrimateAI	Uncertain	0.77	T
PROVEAN	Pathogenic	-4.8	D;.;.;.
REVEL	Uncertain	0.53
Sift	Pathogenic	0.0	D;.;.;.
Sift4G	Uncertain	0.022	D;D;D;D
Polyphen		1.0	D;.;.;D
Vest4		0.71
MutPred		0.80		Gain of disorder (P = 0.0153);Gain of disorder (P = 0.0153);Gain of disorder (P = 0.0153);Gain of disorder (P = 0.0153);
MVP		0.71
MPC		0.86
ClinPred		0.97	D
GERP RS		4.0
RBP_binding_hub_radar		1.0
RBP_regulation_power_radar		2.8
Varity_R		0.88
gMVP		0.89

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: rs878854555; hg19: chr19-50905473;