19-50408900-G-T

Variant names:

• chr19-50408900-G-T
• rs1555791808
• NM_002691.4:c.1891G>T

Variant summary

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

The NM_002691.4(POLD1):​c.1891G>T​(p.Gly631Cys) variant causes a missense, splice region change. The variant was absent in control chromosomes in GnomAD project. 2/3 splice prediction tools predict no significant impact on normal splicing. 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. G631D) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: POLD1 NM_002691.4 missense, splice_region
• Scores: Splicing: ADA: 0.02154
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 4.76
• 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):

• mandibular hypoplasia-deafness-progeroid syndrome

  Inheritance: AD, AR Classification: DEFINITIVE, STRONG, SUPPORTIVE, LIMITED Submitted by: G2P, Orphanet, Ambry Genetics, Labcorp Genetics (formerly Invitae), ClinGen, Genomics England PanelApp
• 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: Ambry Genetics, Labcorp Genetics (formerly Invitae), Genomics England PanelApp
• 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 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

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

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	POLD1	NM_002691.4	MANE Select	c.1891G>T	p.Gly631Cys	missense splice_region	Exon 15 of 27	NP_002682.2	P28340
	POLD1	NM_001308632.1		c.1969G>T	p.Gly657Cys	missense splice_region	Exon 14 of 26	NP_001295561.1	M0R2B7
	POLD1	NM_001256849.1		c.1891G>T	p.Gly631Cys	missense splice_region	Exon 15 of 27	NP_001243778.1	P28340

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	POLD1	ENST00000440232.7	TSL:1 MANE Select	c.1891G>T	p.Gly631Cys	missense splice_region	Exon 15 of 27	ENSP00000406046.1	P28340
	POLD1	ENST00000595904.6	TSL:1	c.1969G>T	p.Gly657Cys	missense splice_region	Exon 15 of 27	ENSP00000472445.1	M0R2B7
	POLD1	ENST00000599857.7	TSL:1	c.1891G>T	p.Gly631Cys	missense splice_region	Exon 15 of 27	ENSP00000473052.1	P28340

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 34

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	1	-	Colorectal cancer, susceptibility to, 10 (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.18
BayesDel_addAF	Benign	-0.084	T
BayesDel_noAF	Benign	-0.36
CADD	Pathogenic	27
DANN	Uncertain	0.99
DEOGEN2	Benign	0.29	T
Eigen	Benign	0.082
Eigen_PC	Benign	0.12
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Benign	0.82	T
M_CAP	Benign	0.044	D
MetaRNN	Uncertain	0.67	D
MetaSVM	Benign	-1.0	T
MutationAssessor	Pathogenic	3.7	H
PhyloP100		4.8
PrimateAI	Uncertain	0.72	T
PROVEAN	Uncertain	-3.2	D
REVEL	Benign	0.10
Sift	Benign	0.033	D
Sift4G	Uncertain	0.032	D
Polyphen		0.052	B
Vest4		0.62
MutPred		0.38		Loss of disorder (P = 0.0377)
MVP		0.61
MPC		1.6
ClinPred		0.94	D
GERP RS		4.7
Varity_R		0.28
gMVP		0.72
Mutation Taster		=44/56	disease causing

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.022
dbscSNV1_RF	Benign	0.18
SpliceAI score (max)		0.37		Details are displayed if max score is > 0.2
DS_DG_spliceai		0.37		Position offset: -2

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

Other links and lift over

dbSNP: rs1555791808; hg19: chr19-50912157;