rs587783429

Variant names:

• chr8-60742912-C-T
• rs587783429
• NM_017780.4:c.1480C>T

Variant summary

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

The NM_017780.4(CHD7):​c.1480C>T​(p.Arg494*) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 32)
• Consequence: CHD7 NM_017780.4 stop_gained
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:16
• Conservation: PhyloP100: 1.71

Genes affected

CHD7 (HGNC:20626): (chromodomain helicase DNA binding protein 7) This gene encodes a protein that contains several helicase family domains. Mutations in this gene have been found in some patients with the CHARGE syndrome. Two transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Oct 2015]

ACMG classification

Verdict is Pathogenic. Variant got 18 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 8-60742912-C-T is Pathogenic according to our data. Variant chr8-60742912-C-T is described in ClinVar as [Pathogenic]. Clinvar id is 158279.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr8-60742912-C-T is described in Lovd as [Pathogenic]. Variant chr8-60742912-C-T is described in Lovd as [Likely_pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CHD7	NM_017780.4	c.1480C>T	p.Arg494*	stop_gained	Exon 2 of 38	ENST00000423902.7	NP_060250.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CHD7	ENST00000423902.7	c.1480C>T	p.Arg494*	stop_gained	Exon 2 of 38	5	NM_017780.4	ENSP00000392028.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:16

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

CHARGE syndrome Pathogenic:9

Jan 11, 2024

3billion

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The variant is not observed in the gnomAD v2.1.1 dataset. Predicted Consequence/Location: Stop-gained (nonsense): 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: VCV000158279 /PMID: 16400610). Therefore, this variant is classified as Pathogenic according to the recommendation of ACMG/AMP guideline. -

Feb 08, 2013

Genetic Services Laboratory, University of Chicago

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Dec 05, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change creates a premature translational stop signal (p.Arg494*) in the CHD7 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in CHD7 are known to be pathogenic (PMID: 22461308, 25077900). This variant is not present in population databases (gnomAD no frequency). This premature translational stop signal has been observed in individual(s) with clinical features of CHARGE syndrome (PMID: 16400610, 21158681, 22461308, 23024289, 24368733, 28832562). In at least one individual the variant was observed to be de novo. ClinVar contains an entry for this variant (Variation ID: 158279). For these reasons, this variant has been classified as Pathogenic. -

Nov 30, 2018

Centre for Mendelian Genomics, University Medical Centre Ljubljana

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was classified as: Pathogenic. The following ACMG criteria were applied in classifying this variant: PVS1,PM2,PP4,PP5. -

Aug 22, 2022

Daryl Scott Lab, Baylor College of Medicine

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

-

Neuberg Centre For Genomic Medicine, NCGM

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The stop gained p.R494* in CHD7 (NM_017780.4) has been reported previously reported in affected patients (Janssen N et al; Lalani SR et al). The variant has been submitted to ClinVar as Pathogenic. The p.R494* variant is novel (not in any individuals) in gnomAD Exomes and is novel (not in any individuals) in 1000 Genomes. This variant is predicted to cause loss of normal protein function through protein truncation. Loss of function mutations have been previously described to be disease causing. For these reasons, this variant has been classified as Pathogenic. -

Aug 01, 2024

Centro Nacional de Genética Medica "Dr. Eduardo E. Castilla", Administración Nacional de Laboratorios e Institutos de Salud

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: research

The c.1480C>T, variant found is located in exon 2 of the CHD7 gene. CHD7 is a gene classified as haploinsufficient, and as a consequence of this variant, there would be no translation and, consequently, a lack of protein (PVS1). There are 15 unrelated case reports in the literature that present this variant with a phenotype consistent with Charge Syndrome (PS4). The variant was not found in the parents of these 15 reported cases that presented a phenotype consistent with Charge Syndrome. Parentage studies are not specified in the reports (PM6_VeryStrong). The variant found is not present in population-based databases such as GnomAD, ExAc, or 1000 Genomes (PM2_Supporting). The patient's phenotype is consistent with Charge Syndrome, and the CHD7 gene is closely associated with the disease (PP4). -

Sep 05, 2016

Genomic Diagnostic Laboratory, Division of Genomic Diagnostics, Children's Hospital of Philadelphia

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Apr 02, 2020

Genomic Medicine Lab, University of California San Francisco

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not provided Pathogenic:6

Nov 10, 2021

Revvity Omics, Revvity

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Feb 01, 2021

Institute of Medical Genetics and Applied Genomics, University Hospital Tübingen

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

-

Laboratory of Diagnostic Genome Analysis, Leiden University Medical Center (LUMC)

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Aug 01, 2017

ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The CHD7 c.1480C>T; p.Arg494Ter variant (rs587783429) induces an early termination codon and is predicted to result in a truncated protein or absent transcript. This variant has previously been reported in individuals with CHARGE syndrome (Lalani 2006, see ClinVar link), and is absent from general population databases (Exome Variant Server, Genome Aggregation Database). Therefore, this variant is considered pathogenic. REFERENCES Link to ClinVar database for p.Arg494Ter: https://www.ncbi.nlm.nih.gov/clinvar/variation/158279/ Lalani SR et al. Spectrum of CHD7 mutations in 110 individuals with CHARGE syndrome and genotype-phenotype correlation. Am J Hum Genet. 2006 Feb;78(2):303-14. -

Nov 22, 2022

GeneDx

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Nonsense variant predicted to result in protein truncation or nonsense mediated decay in a gene for which loss-of-function is a known mechanism of disease; Not observed in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 16400610, 30181649, 25525159, 29453417, 22461308, 24368733, 21158681, 23024289, 28832562, 32625235, 34009138, 31785789) -

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Joint Genome Diagnostic Labs from Nijmegen and Maastricht, Radboudumc and MUMC+

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

CHARGE syndrome;C3552553:Hypogonadotropic hypogonadism 5 with or without anosmia Pathogenic:1

-

Juno Genomics, Hangzhou Juno Genomics, Inc

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

PVS1+PM2_Supporting+PS4_Moderate+PM6 -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.50
CADD	Pathogenic	38
DANN	Uncertain	1.0
Eigen	Pathogenic	0.86
Eigen_PC	Pathogenic	0.74
FATHMM_MKL	Uncertain	0.77	D
Vest4		0.94
GERP RS		5.4

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: rs587783429; hg19: chr8-61655471;