chr15-92979171-G-GA

Variant names:

• chr15-92979171-G-GA
• rs1555442886
• NM_001271.4:c.2765dupA

Variant summary

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

The NM_001271.4(CHD2):​c.2765dupA​(p.Glu923GlyfsTer42) variant causes a frameshift change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 31)
• Consequence: CHD2 NM_001271.4 frameshift
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 9.22

Genes affected

CHD2 (HGNC:1917): (chromodomain helicase DNA binding protein 2) The CHD family of proteins is characterized by the presence of chromo (chromatin organization modifier) domains and SNF2-related helicase/ATPase domains. CHD genes alter gene expression possibly by modification of chromatin structure thus altering access of the transcriptional apparatus to its chromosomal DNA template. Alternatively spliced transcript variants encoding distinct isoforms have been found for this gene. [provided by RefSeq, Jul 2008]

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 15-92979171-G-GA is Pathogenic according to our data. Variant chr15-92979171-G-GA is described in ClinVar as [Pathogenic]. Clinvar id is 474379.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CHD2	NM_001271.4	c.2765dupA	p.Glu923GlyfsTer42	frameshift_variant	Exon 22 of 39	ENST00000394196.9	NP_001262.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CHD2	ENST00000394196.9	c.2765dupA	p.Glu923GlyfsTer42	frameshift_variant	Exon 22 of 39	5	NM_001271.4	ENSP00000377747.4

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 31

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Developmental and epileptic encephalopathy 94 Pathogenic:1

Mar 07, 2020

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant has not been reported in the literature in individuals with CHD2-related conditions. ClinVar contains an entry for this variant (Variation ID: 474379). This sequence change creates a premature translational stop signal (p.Glu923Glyfs*42) in the CHD2 gene. It is expected to result in an absent or disrupted protein product. This variant is not present in population databases (ExAC no frequency). Loss-of-function variants in CHD2 are known to be pathogenic (PMID: 23708187, 24207121). For these reasons, this variant has been classified as Pathogenic. -

Computational scores

Source: dbNSFP v4.3

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs1555442886; hg19: chr15-93522401;