8-60850516-C-T

Position:

• chr8-60850516-C-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.5428C>T​(p.Arg1810*) 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:7
• Conservation: PhyloP100: 1.74

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 8-60850516-C-T is Pathogenic according to our data. Variant chr8-60850516-C-T is described in ClinVar as [Pathogenic]. Clinvar id is 459555.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr8-60850516-C-T is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CHD7	NM_017780.4	c.5428C>T	p.Arg1810*	stop_gained	26/38	ENST00000423902.7	NP_060250.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CHD7	ENST00000423902.7	c.5428C>T	p.Arg1810*	stop_gained	26/38	5	NM_017780.4	ENSP00000392028.1
CHD7	ENST00000524602.5	c.1717-11713C>T		intron_variant		1		ENSP00000437061.1
CHD7	ENST00000695853.1	n.5428C>T		non_coding_transcript_exon_variant	26/37			ENSP00000512218.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:7

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

CHARGE syndrome Pathogenic:5

Pathogenic, criteria provided, single submitter	clinical testing	Rady Children's Institute for Genomic Medicine, Rady Children's Hospital San Diego	-	This nonsense variant found in exon 26 of 38 is predicted to result in loss of normal protein function through either protein truncation or nonsense-mediated mRNA decay (NMD). This variant has been previously reported in patients with CHARGE syndrome, as a de novo change or of unknown inheritance (PMID: 16400610, 26538304, 18445044). It is absent from the gnomAD population database and thus is presumed to be rare. Based on the available evidence, the c.5428C>T (p.Arg1810Ter) variant is classified as Pathogenic. -
Pathogenic, criteria provided, single submitter	clinical testing	3billion	-	The variant is not observed in the gnomAD v2.1.1 dataset. It is a stop-gained (nonsense) variant 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: VCV000459555/PMID: 16400610). This variant is classified as pathogenic according to the recommendation of ACMG/AMP guideline. -
Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Dec 24, 2019	This sequence change creates a premature translational stop signal (p.Arg1810*) in the CHD7 gene. It is expected to result in an absent or disrupted protein product. For these reasons, this variant has been classified as Pathogenic. Loss-of-function variants in CHD7 are known to be pathogenic (PMID: 22461308, 25077900). This variant has been reported in the literature in individuals affected with CHARGE syndrome (PMID: 16400610, 26538304, 18445044). In several of these individuals, the variant was shown to be de novo (PMID: 16400610). ClinVar contains an entry for this variant (Variation ID: 459555). This variant is not present in population databases (ExAC no frequency). -
Pathogenic, criteria provided, single submitter	clinical testing	Juno Genomics, Hangzhou Juno Genomics, Inc	-	PM2_Supporting+PVS1+PM6+PS4_Supporting+PP4 -
Pathogenic, criteria provided, single submitter	clinical testing	Provincial Medical Genetics Program of British Columbia, University of British Columbia	Jan 01, 2022	- -

CHD7-related disorder Pathogenic:1

Pathogenic, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

Jul 19, 2024

The CHD7 c.5428C>T variant is predicted to result in premature protein termination (p.Arg1810*). This variant has been reported as de novo in multiple individuals with CHD7-related disorders (Lalani et al. 2006. PubMed ID: 16400610; Wincent et al 2008. PubMed ID: 18445044; Sohn et al. 2016. PubMed ID: 26538304; Boissel et al. 2017. PubMed ID: 29261186). This variant has not been reported in a large population database, indicating this variant is rare. Nonsense variants in CHD7 are expected to be pathogenic. This variant is interpreted as pathogenic. -

not provided Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

GeneDx

Jul 27, 2023

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: 26538304, 16400610, 33100332, 18445044, 35938004, 29261186, 25525159) -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.59
CADD	Pathogenic	37
DANN	Uncertain	1.0
Eigen	Uncertain	0.51
Eigen_PC	Uncertain	0.33
FATHMM_MKL	Uncertain	0.94	D
Vest4		0.93
GERP RS		0.88
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: rs1554603552; hg19: chr8-61763075; COSMIC: COSV71114014; COSMIC: COSV71114014;