15-92927310-C-T

Position:

• chr15-92927310-C-T

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_001271.4(CHD2):​c.361C>T​(p.Arg121Ter) variant causes a stop gained change. 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: 32)
• Consequence: CHD2 NM_001271.4 stop_gained
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:4
• Conservation: PhyloP100: 4.50

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 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 15-92927310-C-T is Pathogenic according to our data. Variant chr15-92927310-C-T is described in ClinVar as [Pathogenic]. Clinvar id is 60712.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr15-92927310-C-T is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CHD2	NM_001271.4	c.361C>T	p.Arg121Ter	stop_gained	4/39	ENST00000394196.9	NP_001262.3
CHD2	NM_001042572.3	c.361C>T	p.Arg121Ter	stop_gained	4/13		NP_001036037.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CHD2	ENST00000394196.9	c.361C>T	p.Arg121Ter	stop_gained	4/39	5	NM_001271.4	ENSP00000377747	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 29

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:4

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Developmental and epileptic encephalopathy 94 Pathogenic:3

Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 31, 2023	For these reasons, this variant has been classified as Pathogenic. ClinVar contains an entry for this variant (Variation ID: 60712). This premature translational stop signal has been observed in individual(s) with epileptic encephalopathy (PMID: 23708187, 29455050). This variant is not present in population databases (gnomAD no frequency). This sequence change creates a premature translational stop signal (p.Arg121*) in the CHD2 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in CHD2 are known to be pathogenic (PMID: 23708187, 24207121). -
Pathogenic, no assertion criteria provided	literature only	OMIM	Jul 01, 2013	- -
Pathogenic, criteria provided, single submitter	clinical testing	Center for Genomics, Ann and Robert H. Lurie Children's Hospital of Chicago	Nov 11, 2021	CHD2 NM_001271 exon 4 p.Arg121* (c.361C>T): This variant has been reported in the literature as de novo in 1 individual with epileptic encephalopathy (Carvill 2013 PMID:23708187). This variant is not present in large control databases. Evolutionary conservation and computational predictive tools for this variant are limited or unavailable. This variant is predicted to cause a stopgain at this codon, resulting in protein truncation or loss of allelic expression through nonsense-mediated mRNA decay. Loss of function has been suggested as a mechanism of disease for this gene (Carvill 2013 PMID:23708187). In summary, this variant is classified as likely pathogenic based on the data above (predicted impact to protein etc., presence as a de novo in literature). -

not provided Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

GeneDx

Oct 10, 2022

Identified in a patient with epileptic encephalopathy in the published literature (PMID 29455050); 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: 29455050, 24207121, 23708187) -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.63
CADD	Pathogenic	36
DANN	Uncertain	1.0
Eigen	Pathogenic	0.91
Eigen_PC	Pathogenic	0.80
FATHMM_MKL	Pathogenic	0.98	D
MutationTaster	Benign	1.0	A;A;A;A
Vest4		0.75, 0.76, 0.71, 0.79, 0.79
GERP RS		5.0
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: rs397514740; hg19: chr15-93470540;