rs1060503187

chr8-60822638-G-C

Variant summary

Our verdict is Pathogenic. Variant got 11 ACMG points: 11P and 0B. PM2 PM5 PP2 PP3_Strong PP5_Moderate

The NM_017780.4(CHD7):c.3093G>C(p.Trp1031Cys) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 12/21 in silico tools predict a damaging outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. W1031G) has been classified as Pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: CHD7 NM_017780.4 missense
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 10.0

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 11 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr8-60822636-T-G is described in ClinVar as [Pathogenic]. Clinvar id is 981680.Status of the report is no_assertion_criteria_provided, 0 stars.
• PP2: Missense variant where missense usually causes diseases, CHD7
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.992
• PP5: Variant 8-60822638-G-C is Pathogenic according to our data. Variant chr8-60822638-G-C is described in ClinVar as [Pathogenic]. Clinvar id is 411188.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CHD7	NM_017780.4	c.3093G>C	p.Trp1031Cys	missense_variant	12/38	ENST00000423902.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CHD7	ENST00000423902.7	c.3093G>C	p.Trp1031Cys	missense_variant	12/38	5	NM_017780.4	P1
CHD7	ENST00000524602.5	c.1717-39591G>C		intron_variant		1
CHD7	ENST00000525508.1	c.3093G>C	p.Trp1031Cys	missense_variant	11/12	5
CHD7	ENST00000695853.1	c.3093G>C	p.Trp1031Cys	missense_variant, NMD_transcript_variant	12/37

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

CHARGE syndrome Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Invitae

Dec 19, 2016

For these reasons, this variant has been classified as Pathogenic. Two different missense substitutions at this codon (p.Trp1031Arg and p.Trp1031Gly) have been reported to be de novo in two individuals with CHARGE syndrome (PMID: 22461308, 22539353). This suggests that the tryptophan residue is important for CHD7 protein function. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be disruptive, but these predictions have not been confirmed by published functional studies. This variant is not present in population databases (ExAC no frequency) and has not been reported in the literature in individuals with a CHD7-related disease. However, family studies have indicated that this variant was not present in the parents of an individual with clinical features of CHARGE syndrome, which suggests that it was de novo in that affected individual (Invitae). This sequence change replaces tryptophan with cysteine at codon 1031 of the CHD7 protein (p.Trp1031Cys). The tryptophan residue is highly conserved and there is a large physicochemical difference between tryptophan and cysteine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.58	D
BayesDel_noAF	Pathogenic	0.60
Cadd	Pathogenic	33
Dann	Uncertain	0.99
DEOGEN2	Pathogenic	0.95	D;.
Eigen	Pathogenic	1.2
Eigen_PC	Pathogenic	1.1
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	1.0	D;D
M_CAP	Pathogenic	0.77	D
MetaRNN	Pathogenic	0.99	D;D
MetaSVM	Pathogenic	0.93	D
MutationAssessor	Pathogenic	4.8	H;H
MutationTaster	Benign	1.0	D;D;D;D
PrimateAI	Pathogenic	0.93	D
PROVEAN	Pathogenic	-12	D;D
REVEL	Pathogenic	0.95
Sift	Pathogenic	0.0	D;D
Sift4G	Pathogenic	0.0010	D;D
Polyphen		1.0	D;D
Vest4		0.92
MutPred		0.94		Gain of glycosylation at T1027 (P = 0.146);Gain of glycosylation at T1027 (P = 0.146);
MVP		1.0
MPC		2.2
ClinPred		1.0	D
GERP RS		5.5
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.99
gMVP		1.0

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.030		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: rs1060503187; hg19: chr8-61735197;