19-50408895-A-G

Variant names:

• chr19-50408895-A-G
• rs772953240
• NM_002691.4:c.1886A>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.1886A>G​(p.Lys629Arg) 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. K629I) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: POLD1 NM_002691.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.31
• Publications: 0 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

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=0.09236869).

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.1886A>G	p.Lys629Arg	missense	Exon 15 of 27	NP_002682.2
	POLD1	NM_001308632.1		c.1964A>G	p.Lys655Arg	missense	Exon 14 of 26	NP_001295561.1
	POLD1	NM_001256849.1		c.1886A>G	p.Lys629Arg	missense	Exon 15 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.1886A>G	p.Lys629Arg	missense	Exon 15 of 27	ENSP00000406046.1
	POLD1	ENST00000595904.6	TSL:1	c.1964A>G	p.Lys655Arg	missense	Exon 15 of 27	ENSP00000472445.1
	POLD1	ENST00000599857.7	TSL:1	c.1886A>G	p.Lys629Arg	missense	Exon 15 of 27	ENSP00000473052.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 34

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Hereditary cancer-predisposing syndrome Uncertain:1

Nov 22, 2023

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.K629R variant (also known as c.1886A>G), located in coding exon 14 of the POLD1 gene, results from an A to G substitution at nucleotide position 1886. The lysine at codon 629 is replaced by arginine, 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 v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.067
BayesDel_addAF	Benign	-0.30	T
BayesDel_noAF	Benign	-0.67
CADD	Benign	15
DANN	Benign	0.70
DEOGEN2	Benign	0.13	T
Eigen	Benign	-0.47
Eigen_PC	Benign	-0.34
FATHMM_MKL	Benign	0.68	D
LIST_S2	Benign	0.73	T
M_CAP	Benign	0.0088	T
MetaRNN	Benign	0.092	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.54	N
PhyloP100		1.3
PrimateAI	Uncertain	0.71	T
PROVEAN	Benign	-1.0	N
REVEL	Benign	0.052
Sift	Benign	0.54	T
Sift4G	Benign	0.53	T
Polyphen		0.0090	B
Vest4		0.14
MutPred		0.35		Loss of methylation at K629 (P = 0.0167)
MVP		0.43
MPC		0.51
ClinPred		0.32	T
GERP RS		3.7
Varity_R		0.050
gMVP		0.29
Mutation Taster		=78/22	polymorphism

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

Other links and lift over

dbSNP: rs772953240; hg19: chr19-50912152;