3-14148732-C-G

Variant names:

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1PM2PP5_Very_Strong

The NM_004628.5(XPC):c.2251-1G>C variant causes a splice acceptor, intron change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000118 in 1,613,880 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 3/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Pathogenic (★★).

Frequency

Genomes: 𝑓 0.000059 ( 0 hom., cov: 33)

Exomes 𝑓: 0.0000068 ( 0 hom. )

Consequence

XPC
NM_004628.5 splice_acceptor, intron

Scores

Splicing: ADA: 1.000

Clinical Significance

Pathogenic criteria provided, multiple submitters, no conflicts P:15

Conservation

PhyloP100: 7.70

Variant links:

Genes affected

XPC (HGNC:12816): (XPC complex subunit, DNA damage recognition and repair factor) The protein encoded by this gene is a key component of the XPC complex, which plays an important role in the early steps of global genome nucleotide excision repair (NER). The encoded protein is important for damage sensing and DNA binding, and shows a preference for single-stranded DNA. Mutations in this gene or some other NER components can result in Xeroderma pigmentosum, a rare autosomal recessive disorder characterized by increased sensitivity to sunlight with the development of carcinomas at an early age. Alternatively spliced transcript variants have been found for this gene. [provided by RefSeq, Aug 2017]

XPC links:

XPC-AS1 (HGNC:55014): (XPC antisense RNA 1)

XPC-AS1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 18 ACMG points.

PVS1

Splicing +-2 bp (donor or acceptor) variant, LoF is a know mechanism of disease, Cryptic splice site detected, with MaxEntScore 6, offset of 44, new splice context is: gtgtacctcttcctgcccAGcat. Cryptic site results in frameshift change. If cryptic site found is not functional and variant results in exon loss, it results in frameshift change.

PM2

Very rare variant in population databases, with high coverage;

PP5

Variant 3-14148732-C-G is Pathogenic according to our data. Variant chr3-14148732-C-G is described in ClinVar as [Pathogenic]. Clinvar id is 190213.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
XPC	NM_004628.5 link	c.2251-1G>C		splice_acceptor_variant, intron_variant	Intron 12 of 15	ENST00000285021.12	NP_004619.3	Q01831-1X5DRB1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
XPC	ENST00000285021.12 link	c.2251-1G>C		splice_acceptor_variant, intron_variant	Intron 12 of 15	1	NM_004628.5	ENSP00000285021.8		Q01831-1

Frequencies

GnomAD3 genomes

AF:

0.0000591

AC:

AN:

152212

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000169

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000131

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000241

AC:

AN:

249174

Hom.:

AF XY:

0.0000148

AC XY:

AN XY:

135180

show subpopulations

Gnomad AFR exome

AF:

0.000323

Gnomad AMR exome

AF:

0.0000290

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000684

AC:

AN:

1461668

Hom.:

Cov.:

AF XY:

0.00000550

AC XY:

AN XY:

727104

show subpopulations

Gnomad4 AFR exome

AF:

0.000209

Gnomad4 AMR exome

AF:

0.0000447

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

8.99e-7

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000591

AC:

AN:

152212

Hom.:

Cov.:

AF XY:

0.0000403

AC XY:

AN XY:

74372

show subpopulations

Gnomad4 AFR

AF:

0.000169

Gnomad4 AMR

AF:

0.000131

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000142

Hom.:

Bravo

AF:

0.000155

ExAC

AF:

0.0000165

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:15

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Xeroderma pigmentosum, group C

Pathogenic:9

Oct 17, 2007

Claritas Genomics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Dr.Nikuei Genetic Center

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Mar 21, 2024

Baylor Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Mar 17, 2024

Genomic Medicine Center of Excellence, King Faisal Specialist Hospital and Research Centre

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: research

- -

Oct 31, 2022

Laboratorio de Genetica e Diagnostico Molecular, Hospital Israelita Albert Einstein

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

ACMG classification criteria: PVS1 very strong, PS3 supporting, PS4 strong, PM2 moderated, PM3 strong, PP1 supporting -

Dec 01, 2015

Medical Molecular Genetics Department, National Research Center

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: research

- -

Nov 19, 2021

Myriad Genetics, Inc.

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

NM_004628.4(XPC):c.2251-1G>C is a canonical splice variant classified as pathogenic in the context of xeroderma pigmentosum group C. c.2251-1G>C has been observed in cases with relevant disease (PMID: 21482201). Functional assessments of this variant are not available in the literature. c.2251-1G>C has been observed in population frequency databases (gnomAD: AFR 0.04%). In summary, NM_004628.4(XPC):c.2251-1G>C is a canonical splice variant in a gene where loss of function is a known mechanism of disease, is predicted to disrupt protein function, and has been observed more frequently in cases with the relevant disease than in healthy populations. Please note: this variant was assessed in the context of healthy population screening. -

Oct 31, 2018

Fulgent Genetics, Fulgent Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Mar 01, 2021

DNA Repair Laboratory, Institute of Biomedical Sciences - University of Sao Paulo

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: research

- -

not provided

Pathogenic:3

Apr 25, 2022

GeneDx

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Canonical splice site variant in a gene for which loss-of-function is a known mechanism of disease; This variant is associated with the following publications: (PMID: 31930276, 21482201, 29753700, 26884178, 29569758, 31589614, 33672602) -

Jan 08, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change affects an acceptor splice site in intron 12 of the XPC gene. RNA analysis indicates that disruption of this splice site induces altered splicing and may result in an absent or disrupted protein product. This variant is present in population databases (rs754673606, gnomAD 0.02%). Disruption of this splice site has been observed in individual(s) with xeroderma pigmentosum (PMID: 21482201). It has also been observed to segregate with disease in related individuals. ClinVar contains an entry for this variant (Variation ID: 190213). Studies have shown that disruption of this splice site results in abnormal splicing, including skipping of exon 13, retention of intron 12, and/or a deletion of 44 nucleotides in exon 13 and introduces a premature termination codon (PMID: 21482201). The resulting mRNA is expected to undergo nonsense-mediated decay. For these reasons, this variant has been classified as Pathogenic. -

Jun 01, 2021

CeGaT Center for Human Genetics Tuebingen

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Xeroderma pigmentosum

Pathogenic:2

Jul 11, 2017

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

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: The XPC c.2251-1G>C variant involves the alteration of a conserved intronic nucleotide. One in silico tool predicts a damaging outcome for this variant. 5/5 splice prediction tools predict a significant impact on normal splicing. Functional studies proved the exon skipping and the absence of the XPC protein associated with impaired DNA synthesis in XP patients cultured fibroblasts (Cartault_DNA_Repair_2011, Fassihi_PNAS_2016). This variant was found in 2/120678 control chromosomes at a frequency of 0.0000166, which does not exceed the estimated maximal expected allele frequency of a pathogenic XPC variant (0.0014142). This variant is reported in multiple homozygous XP patients (Cartault_DNA_Repair_2011, Fassihi_PNAS_2016). In addition, one clinical diagnostic laboratory classified this variant as pathogenic. Taken together, this variant is classified as pathogenic. -

Jul 01, 2023

Division of Human Genetics, National Health Laboratory Service/University of the Witwatersrand

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: research

- -

XPC-related disorder

Pathogenic:1

Dec 21, 2023

PreventionGenetics, part of Exact Sciences

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

The XPC c.2251-1G>C variant is predicted to disrupt the AG splice acceptor site and interfere with normal splicing. This variant has been reported in the homozygous or compound heterozygous state in individuals with xeroderma pigmentosum (see for example, Santiago et al. 2020. PubMed ID: 32239545; Fassihi et al. 2016. PubMed ID: 26884178; reported as IVS 12-1G>C in Cartault et al. 2011. PubMed ID: 21482201). This variant is reported in 0.025% of alleles in individuals of African descent in gnomAD. Variants that disrupt the consensus splice acceptor site in XPC are expected to be pathogenic. This variant is interpreted as pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Pathogenic

0.41

BayesDel_noAF

Pathogenic

0.25

CADD

Pathogenic

DANN

Uncertain

0.99

Eigen

Pathogenic

1.1

Eigen_PC

Pathogenic

0.89

FATHMM_MKL

Pathogenic

0.98

GERP RS

5.5

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.9

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Pathogenic

1.0

dbscSNV1_RF

Pathogenic

0.93

SpliceAI score (max)

0.93

Details are displayed if max score is > 0.2

DS_AG_spliceai

0.63

Position offset: -45

DS_AL_spliceai

0.93

Position offset: -1

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

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over