chr9-97675485-TTACGG-T

Position:

• chr9-97675485-TTACGG-T

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PVS1_Moderate PM2 PP5_Moderate

The NM_000380.4(XPA):​c.771_775del​(p.Tyr257Ter) variant causes a stop gained, frameshift change. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Likely pathogenic (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: XPA NM_000380.4 stop_gained, frameshift
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 7.07

Genes affected

XPA (HGNC:12814): (XPA, DNA damage recognition and repair factor) This gene encodes a zinc finger protein plays a central role in nucleotide excision repair (NER), a specialized type of DNA repair. NER is responsible for repair of UV radiation-induced photoproducts and DNA adducts induced by chemical carcinogens and chemotherapeutic drugs. The encoded protein interacts with DNA and several NER proteins, acting as a scaffold to assemble the NER incision complex at sites of DNA damage. Mutations in this gene cause Xeroderma pigmentosum complementation group A (XP-A), an autosomal recessive skin disorder featuring hypersensitivity to sunlight and increased risk for skin cancer. [provided by RefSeq, Aug 2017]

ACMG classification

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most exon, not predicted to undergo nonsense mediated mRNA decay. Fraction of 0.062 CDS is truncated, and there are 0 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 9-97675485-TTACGG-T is Pathogenic according to our data. Variant chr9-97675485-TTACGG-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 1705178.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
XPA	NM_000380.4	c.771_775del	p.Tyr257Ter	stop_gained, frameshift_variant	6/6	ENST00000375128.5	NP_000371.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
XPA	ENST00000375128.5	c.771_775del	p.Tyr257Ter	stop_gained, frameshift_variant	6/6	1	NM_000380.4	ENSP00000364270	P1
XPA	ENST00000485042.1	n.283_287del		non_coding_transcript_exon_variant	2/2	3
XPA	ENST00000462523.5	c.*207_*211del		3_prime_UTR_variant, NMD_transcript_variant	7/7	5		ENSP00000433006

Frequencies

GnomAD3 genomes Cov.: 32

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Xeroderma pigmentosum Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Aug 23, 2022

Variant summary: XPA c.771_775delCCGTA (p.Tyr257X) results in a premature termination codon, predicted to cause a truncation of the encoded protein or absence of the protein. Truncations downstream of this position have been classified as pathogenic in ClinVar. The variant was absent in 251188 control chromosomes (gnomAD). To our knowledge, no occurrence of c.771_775delCCGTA in individuals affected with Xeroderma Pigmentosum and no experimental evidence demonstrating its impact on protein function have been reported. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014. Based on the evidence outlined above, the variant was classified as likely pathogenic. -

Computational scores

Source: dbNSFP v4.3

Splicing

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: chr9-100437767;