rs1554588712

Positions:

• chr8-60781252-GA-G

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_017780.4(CHD7):​c.1925del​(p.Lys642ArgfsTer69) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000706 in 1,416,080 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Pathogenic (★). Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 7.1e-7 (0 hom.)
• Consequence: CHD7 NM_017780.4 frameshift
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 2.28

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 12 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 8-60781252-GA-G is Pathogenic according to our data. Variant chr8-60781252-GA-G is described in ClinVar as [Pathogenic]. Clinvar id is 529122.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CHD7	NM_017780.4	c.1925del	p.Lys642ArgfsTer69	frameshift_variant	3/38	ENST00000423902.7	NP_060250.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CHD7	ENST00000423902.7	c.1925del	p.Lys642ArgfsTer69	frameshift_variant	3/38	5	NM_017780.4	ENSP00000392028	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 7.06e-7 AC: 1 AN: 1416080 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 699896

Gnomad4 AFR exome AF: 0.0000312

Gnomad4 AMR exome AF: 0.00

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: 0.00

Gnomad4 OTH exome AF: 0.00

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

Labcorp Genetics (formerly Invitae), Labcorp

Oct 22, 2017

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 an individual affected with CHARGE syndrome (PMID: 21158681). This variant is not present in population databases (ExAC no frequency). This sequence change creates a premature translational stop signal (p.Lys642Argfs*69) in the CHD7 gene. It is expected to result in an absent or disrupted protein product. -

Computational scores

Source: dbNSFP v4.3

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: rs1554588712; hg19: chr8-61693811;