15-92901249-T-G

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 3P and 2B. PM2 PP2 BP4_Moderate

The NM_001271.4(CHD2):c.12T>G(p.Asn4Lys) variant causes a missense change. The variant allele was found at a frequency of 0.000000692 in 1,445,290 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. N4S) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: CHD2 NM_001271.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.82

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 Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant where missense usually causes diseases, CHD2
• BP4: Computational evidence support a benign effect (MetaRNN=0.21290645).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CHD2	NM_001271.4	c.12T>G	p.Asn4Lys	missense_variant	2/39	ENST00000394196.9
CHD2	NM_001042572.3	c.12T>G	p.Asn4Lys	missense_variant	2/13

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CHD2	ENST00000394196.9	c.12T>G	p.Asn4Lys	missense_variant	2/39	5	NM_001271.4	P1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD3 exomes AF: 0.00000806 AC: 2 AN: 248110 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 134164

Gnomad AFR exome AF: 0.000125

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 6.92e-7 AC: 1 AN: 1445290 Hom.: 0 Cov.: 27 AF XY: 0.00 AC XY: 0 AN XY: 719834

Gnomad4 AFR exome AF: 0.0000302

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.: 31

ExAC AF: 0.0000165 AC: 2

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Developmental and epileptic encephalopathy 94 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Apr 21, 2021

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt CHD2 protein function. This variant has not been reported in the literature in individuals with CHD2-related conditions. This variant is present in population databases (rs750955957, ExAC 0.02%). This sequence change replaces asparagine with lysine at codon 4 of the CHD2 protein (p.Asn4Lys). The asparagine residue is moderately conserved and there is a moderate physicochemical difference between asparagine and lysine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.24
BayesDel_addAF	Benign	-0.13	T
BayesDel_noAF	Benign	-0.19
Cadd	Uncertain	24
Dann	Uncertain	0.98
Eigen	Benign	0.086
Eigen_PC	Uncertain	0.28
FATHMM_MKL	Uncertain	0.78	D
LIST_S2	Benign	0.84	T;T;T;T;T;T;T
M_CAP	Benign	0.053	D
MetaRNN	Benign	0.21	T;T;T;T;T;T;T
MetaSVM	Uncertain	-0.060	T
MutationTaster	Benign	0.98	D;D;D
PrimateAI	Uncertain	0.77	T
Sift4G	Benign	0.49	T;T;T;.;.;T;T
Polyphen		0.28, 0.18	.;B;B;.;.;.;.
Vest4		0.44, 0.50, 0.40, 0.64, 0.50, 0.40
MutPred		0.26		Gain of methylation at N4 (P = 0.0106);Gain of methylation at N4 (P = 0.0106);Gain of methylation at N4 (P = 0.0106);Gain of methylation at N4 (P = 0.0106);Gain of methylation at N4 (P = 0.0106);Gain of methylation at N4 (P = 0.0106);Gain of methylation at N4 (P = 0.0106);
MVP		0.63
MPC		0.55
ClinPred		0.39	T
GERP RS		6.0
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.20
gMVP		0.26

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.14		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: rs750955957; hg19: chr15-93444479;