19-50414989-C-G

Variant names:

• chr19-50414989-C-G
• rs768048535
• NM_002691.4:c.2563C>G

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 2P and 1B. PM2 BP6

The NM_002691.4(POLD1):​c.2563C>G​(p.Arg855Gly) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R855Q) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 33)
• Consequence: POLD1 NM_002691.4 missense, splice_region
• Scores: Splicing: ADA: 0.001955
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:3 B:1
• Conservation: PhyloP100: -0.0540
• 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):

• 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 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP6: Variant 19-50414989-C-G is Benign according to our data. Variant chr19-50414989-C-G is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 408084.

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.2563C>G	p.Arg855Gly	missense splice_region	Exon 20 of 27	NP_002682.2	P28340
	POLD1	NM_001308632.1		c.2641C>G	p.Arg881Gly	missense splice_region	Exon 19 of 26	NP_001295561.1	M0R2B7
	POLD1	NM_001256849.1		c.2563C>G	p.Arg855Gly	missense splice_region	Exon 20 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.2563C>G	p.Arg855Gly	missense splice_region	Exon 20 of 27	ENSP00000406046.1	P28340
	POLD1	ENST00000595904.6	TSL:1	c.2641C>G	p.Arg881Gly	missense splice_region	Exon 20 of 27	ENSP00000472445.1	M0R2B7
	POLD1	ENST00000599857.7	TSL:1	c.2563C>G	p.Arg855Gly	missense splice_region	Exon 20 of 27	ENSP00000473052.1	P28340

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD2 exomes AF: 0.00000513 AC: 1 AN: 194888 AF XY: 0.00000944

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 FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000118

Gnomad OTH exome AF: 0.00

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.0000189

ExAC AF: 0.00000829 AC: 1

ClinVar

ClinVar submissions

Significance: Conflicting classifications of pathogenicity

Revision: criteria provided, conflicting classifications

Pathogenic	VUS	Benign	Condition
-	2	-	Colorectal cancer, susceptibility to, 10 (2)
-	-	1	Hereditary cancer-predisposing syndrome (1)
-	1	-	not provided (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.33
BayesDel_addAF	Benign	-0.13	T
BayesDel_noAF	Benign	-0.42
CADD	Benign	16
DANN	Uncertain	0.98
DEOGEN2	Benign	0.36	T
Eigen	Benign	-0.93
Eigen_PC	Benign	-1.1
FATHMM_MKL	Benign	0.22	N
LIST_S2	Pathogenic	0.98	D
M_CAP	Uncertain	0.25	D
MetaRNN	Uncertain	0.57	D
MetaSVM	Benign	-1.0	T
MutationAssessor	Uncertain	2.0	M
PhyloP100		-0.054
PrimateAI	Pathogenic	0.83	D
PROVEAN	Pathogenic	-6.5	D
REVEL	Benign	0.21
Sift	Uncertain	0.020	D
Sift4G	Uncertain	0.025	D
Polyphen		0.27	B
Vest4		0.62
MVP		0.26
MPC		1.3
ClinPred		0.68	D
GERP RS		-8.6
Varity_R		0.60
gMVP		0.77
Mutation Taster		=8/92	disease causing

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.0020
dbscSNV1_RF	Benign	0.22
SpliceAI score (max)		0.050		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: rs768048535; hg19: chr19-50918246;