19-50417924-C-G

Variant names:

• chr19-50417924-C-G
• rs142223599
• NM_002691.4:c.3301C>G

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_002691.4(POLD1):​c.3301C>G​(p.Pro1101Ala) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 15/22 in silico tools predict 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. P1101T) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 31)
• Consequence: POLD1 NM_002691.4 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 1.09
• Publications: 1 publications found

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

ENSG00000142539 (HGNC:):

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.106806844).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_002691.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	POLD1	NM_002691.4	MANE Select	c.3301C>G	p.Pro1101Ala	missense	Exon 27 of 27	NP_002682.2
	POLD1	NM_001308632.1		c.3379C>G	p.Pro1127Ala	missense	Exon 26 of 26	NP_001295561.1
	POLD1	NM_001256849.1		c.3301C>G	p.Pro1101Ala	missense	Exon 27 of 27	NP_001243778.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	POLD1	ENST00000440232.7	TSL:1 MANE Select	c.3301C>G	p.Pro1101Ala	missense	Exon 27 of 27	ENSP00000406046.1
	POLD1	ENST00000595904.6	TSL:1	c.3379C>G	p.Pro1127Ala	missense	Exon 27 of 27	ENSP00000472445.1
	POLD1	ENST00000599857.7	TSL:1	c.3301C>G	p.Pro1101Ala	missense	Exon 27 of 27	ENSP00000473052.1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 31

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000378

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

Jul 15, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces proline, which is neutral and non-polar, with alanine, which is neutral and non-polar, at codon 1101 of the POLD1 protein (p.Pro1101Ala). 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: 1371060). 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. 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

Aug 01, 2025

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.3301C>G (p.P1101A) alteration is located in exon 27 (coding exon 26) of the POLD1 gene. This alteration results from a C to G substitution at nucleotide position 3301, causing the proline (P) at amino acid position 1101 to be replaced by an alanine (A). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear.

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.057
BayesDel_addAF	Benign	-0.19	T
BayesDel_noAF	Benign	-0.51
CADD	Benign	16
DANN	Benign	0.81
DEOGEN2	Benign	0.14	T
Eigen	Benign	-0.75
Eigen_PC	Benign	-0.64
FATHMM_MKL	Benign	0.67	D
LIST_S2	Benign	0.78	T
M_CAP	Benign	0.077	D
MetaRNN	Benign	0.11	T
MetaSVM	Benign	-0.93	T
MutationAssessor	Benign	0.34	N
PhyloP100		1.1
PrimateAI	Uncertain	0.65	T
PROVEAN	Benign	-0.45	N
REVEL	Benign	0.061
Sift	Benign	0.62	T
Sift4G	Benign	0.84	T
Polyphen		0.0070	B
Vest4		0.41
MutPred		0.21		Loss of glycosylation at P1101 (P = 0.0242)
MVP		0.27
MPC		0.61
ClinPred		0.065	T
GERP RS		2.8
RBP_binding_hub_radar		1.1
RBP_regulation_power_radar		2.8
Varity_R		0.14
gMVP		0.17
Mutation Taster		=85/15	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs142223599; hg19: chr19-50921181;