6-43582366-GT-G

Position:

• chr6-43582366-GT-G

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PVS1_Strong PM2 PP5_Moderate

The NM_006502.3(POLH):​c.54del​(p.Phe18LeufsTer12) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: POLH NM_006502.3 frameshift
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 0.732

Genes affected

POLH (HGNC:9181): (DNA polymerase eta) This gene encodes a member of the Y family of specialized DNA polymerases. It copies undamaged DNA with a lower fidelity than other DNA-directed polymerases. However, it accurately replicates UV-damaged DNA; when thymine dimers are present, this polymerase inserts the complementary nucleotides in the newly synthesized DNA, thereby bypassing the lesion and suppressing the mutagenic effect of UV-induced DNA damage. This polymerase is thought to be involved in hypermutation during immunoglobulin class switch recombination. Mutations in this gene result in XPV, a variant type of xeroderma pigmentosum. Several transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, May 2014]

POLR1C (HGNC:):

ACMG classification

Verdict is Likely_pathogenic. Variant got 8 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant located near the start codon (<100nt), not predicted to undergo nonsense mediated mRNA decay. There are 16 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 6-43582366-GT-G is Pathogenic according to our data. Variant chr6-43582366-GT-G is described in ClinVar as [Pathogenic]. Clinvar id is 2865714.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
POLH	NM_006502.3	c.54del	p.Phe18LeufsTer12	frameshift_variant	2/11	ENST00000372236.9	NP_006493.1
POLH	NM_001291970.2	c.54del	p.Phe18LeufsTer12	frameshift_variant	2/11		NP_001278899.1
POLH	NM_001291969.2	c.-17-634del		intron_variant			NP_001278898.1
POLR1C	NM_001318876.2	c.945+53102del		intron_variant			NP_001305805.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
POLH	ENST00000372236.9	c.54del	p.Phe18LeufsTer12	frameshift_variant	2/11	1	NM_006502.3	ENSP00000361310	P1
POLH	ENST00000372226.1	c.54del	p.Phe18LeufsTer12	frameshift_variant	2/11	1		ENSP00000361300
POLH	ENST00000443535.1	c.-49-634del		intron_variant		2		ENSP00000405320

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

May 28, 2023

This sequence change creates a premature translational stop signal (p.Phe18Leufs*12) in the POLH gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in POLH are known to be pathogenic (PMID: 11773631, 24130121, 25256075). For these reasons, this variant has been classified as Pathogenic. This variant has not been reported in the literature in individuals affected with POLH-related conditions. This variant is not present in population databases (gnomAD no frequency). -

Computational scores

Source: dbNSFP v4.3

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

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr6-43550103;