chr9-97684977-G-A

Position:

• chr9-97684977-G-A

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_000380.4(XPA):​c.619C>T​(p.Arg207Ter) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000157 in 1,461,368 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★). Synonymous variant affecting the same amino acid position (i.e. R207R) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.000016 (0 hom.)
• Consequence: XPA NM_000380.4 stop_gained
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:11
• Conservation: PhyloP100: 3.44

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 Pathogenic. Variant got 18 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most 50 bp of the penultimate exon, not predicted to undergo nonsense mediated mRNA decay. There are 20 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 9-97684977-G-A is Pathogenic according to our data. Variant chr9-97684977-G-A is described in ClinVar as [Pathogenic]. Clinvar id is 996.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
XPA	NM_000380.4	c.619C>T	p.Arg207Ter	stop_gained	5/6	ENST00000375128.5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
XPA	ENST00000375128.5	c.619C>T	p.Arg207Ter	stop_gained	5/6	1	NM_000380.4	P1
XPA	ENST00000496104.1	n.413C>T		non_coding_transcript_exon_variant	4/4	3
XPA	ENST00000462523.5	c.619C>T	p.Arg207Ter	stop_gained, NMD_transcript_variant	5/7	5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.0000239 AC: 6 AN: 251098 Hom.: 0 AF XY: 0.0000147 AC XY: 2 AN XY: 135732

Gnomad AFR exome AF: 0.0000616

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000327

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000352

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000157 AC: 23 AN: 1461368 Hom.: 0 Cov.: 31 AF XY: 0.0000151 AC XY: 11 AN XY: 726998

Gnomad4 AFR exome AF: 0.0000299

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000505

Gnomad4 SAS exome AF: 0.0000232

Gnomad4 FIN exome AF: 0.0000188

Gnomad4 NFE exome AF: 0.0000144

Gnomad4 OTH exome AF: 0.0000166

GnomAD4 genome Cov.: 32

ExAC AF: 0.0000247 AC: 3

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:11

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Xeroderma pigmentosum group A Pathogenic:7

Pathogenic, criteria provided, single submitter	clinical testing	Fulgent Genetics, Fulgent Genetics	Dec 14, 2021	- -
Pathogenic, criteria provided, single submitter	research	Medical Molecular Genetics Department, National Research Center	Dec 01, 2015	- -
Pathogenic, criteria provided, single submitter	clinical testing	Counsyl	Nov 02, 2017	- -
Pathogenic, no assertion criteria provided	literature only	OMIM	Mar 01, 1992	- -
Pathogenic, criteria provided, single submitter	clinical testing	Center for Genomic Medicine, King Faisal Specialist Hospital and Research Center	Mar 14, 2024	- -
Pathogenic, criteria provided, single submitter	clinical testing	Baylor Genetics	Nov 28, 2023	- -
Pathogenic, criteria provided, single submitter	clinical testing	3billion	Feb 23, 2023	The variant is observed at an extremely low frequency in the gnomAD v2.1.1 dataset (total allele frequency: 0.002%). This variant was predicted to result in a loss or disruption of normal protein function through nonsense-mediated decay (NMD) or protein truncation. Multiple pathogenic variants are reported downstream of the variant. The variant has been reported at least twice as pathogenic with clinical assertions and evidence for the classification (ClinVar ID: VCV000000996 / PMID: 1372102). Therefore, this variant is classified as Pathogenic according to the recommendation of ACMG/AMP guideline. -

not provided Pathogenic:3

Pathogenic, criteria provided, single submitter	clinical testing	GeneDx	May 18, 2018	The R207X pathogenic variant in the XPA gene has been reported previously either in the homozygous state or in combination with another XPA variant in multiple individuals with xeroderma pigmentosum (Satokata et al., 1992; Messaoud et al., 2012; Santiago et al., 2015; Zhang et al., 2017). This variant is predicted to cause loss of normal protein function through protein truncation. Functional studies demonstrated that R207X is associated with impaired function of the XPA protein as a processivity factor (Bartels et al., 2007). The R207X variant is observed in 6/245,910 (0.0002%) alleles in large population cohorts (Lek et al., 2016). We interpret R207X as a pathogenic variant. -
Pathogenic, criteria provided, single submitter	clinical testing	Institute of Medical Genetics and Applied Genomics, University Hospital Tübingen	Feb 01, 2021	- -
Pathogenic, criteria provided, single submitter	clinical testing	Invitae	Jan 28, 2024	This sequence change creates a premature translational stop signal (p.Arg207*) in the XPA gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in XPA are known to be pathogenic (PMID: 27607234). This variant is present in population databases (rs104894133, gnomAD 0.007%). This premature translational stop signal has been observed in individual(s) with xeroderma pigmentosum (PMID: 1372102, 9671271). ClinVar contains an entry for this variant (Variation ID: 996). For these reasons, this variant has been classified as Pathogenic. -

Xeroderma pigmentosum Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

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

May 09, 2021

Variant summary: XPA c.619C>T (p.Arg207X) results in a premature termination codon, predicted to cause a truncation of the encoded protein or absence of the protein due to nonsense mediated decay, which are commonly known mechanisms for disease. Truncations downstream of this position have been classified as pathogenic by our laboratory. The variant allele was found at a frequency of 2.4e-05 in 251098 control chromosomes. c.619C>T has been reported in the literature in multiple individuals affected with Xeroderma Pigmentosum (example, Satokata_1992, Messaoud_2012, Zhang_2017, Salomao_2018). These data indicate that the variant is very likely to be associated with disease. Four clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation. All laboratories classified the variant as pathogenic. Based on the evidence outlined above, the variant was classified as pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.49	D
BayesDel_noAF	Pathogenic	0.56
CADD	Pathogenic	39
DANN	Uncertain	0.99
Eigen	Uncertain	0.38
Eigen_PC	Benign	0.21
FATHMM_MKL	Uncertain	0.93	D
MutationTaster	Benign	1.0	A
Vest4		0.96
GERP RS		3.0
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1

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

Publications

LitVar

Other links and lift over

dbSNP: rs104894133; hg19: chr9-100447259;