rs587783446

Variant names:

• chr8-60850546-C-T
• rs587783446
• NM_017780.4:c.5458C>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.5458C>T​(p.Arg1820*) 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: 33)
• Consequence: CHD7 NM_017780.4 stop_gained
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:5
• Conservation: PhyloP100: 1.73

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 8-60850546-C-T is Pathogenic according to our data. Variant chr8-60850546-C-T is described in ClinVar as [Pathogenic]. Clinvar id is 158302.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr8-60850546-C-T is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CHD7	NM_017780.4	c.5458C>T	p.Arg1820*	stop_gained	Exon 26 of 38	ENST00000423902.7	NP_060250.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CHD7	ENST00000423902.7	c.5458C>T	p.Arg1820*	stop_gained	Exon 26 of 38	5	NM_017780.4	ENSP00000392028.1
CHD7	ENST00000524602.5	c.1717-11683C>T		intron_variant	Intron 2 of 4	1		ENSP00000437061.1
CHD7	ENST00000695853.1	n.5458C>T		non_coding_transcript_exon_variant	Exon 26 of 37			ENSP00000512218.1
CHD7	ENST00000527921.1	n.-191C>T		upstream_gene_variant		4

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:5

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

CHARGE syndrome Pathogenic:4

Aug 18, 2022

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.Arg1820*) 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 CHARGE syndrome (PMID: 16169932, 23024289, 28991257). In at least one individual the variant was observed to be de novo. ClinVar contains an entry for this variant (Variation ID: 158302). For these reasons, this variant has been classified as Pathogenic. -

Mar 02, 2021

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, PS4 supporting, PM2 moderate -

-

Institute for Genomic Statistics and Bioinformatics, University Hospital Bonn

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

May 24, 2018

Genetic Services Laboratory, University of Chicago

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

DNA sequence analysis of the CHD7 gene demonstrated a sequence change, c.5458C>T, which results in the creation of a premature stop codon at amino acid position 1820, p.Arg1820*. This pathogenic sequence change is predicted to result in an abnormal transcript, which may be degraded, or may lead to the production of a truncated CHD7 protein with potentially abnormal function. This pathogenic sequence change has previously been described in patients with CHARGE syndrome (Sanlaville et. al., 2006; Aref-Eshghi et. al., 2018). -

not provided Pathogenic:1

Feb 25, 2024

GeneDx

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Identified in patients with features of CHARGE spectrum disorder referred for genetic testing at GeneDx and in published literature (PMID: 26563674, 27321065, 16169932); 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 at significant frequency in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 25525159, 28991257, 29191495, 27321065, 32368696, 35904121, 26563674, 16169932, 37086723) -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.60
CADD	Pathogenic	43
DANN	Uncertain	1.0
Eigen	Pathogenic	0.80
Eigen_PC	Pathogenic	0.69
FATHMM_MKL	Uncertain	0.96	D
Vest4		0.95
GERP RS		5.5
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7

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: rs587783446; hg19: chr8-61763105;