NM_001271.4:c.1172C>G

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -5 ACMG points: 0P and 5B. BP4BS2

The NM_001271.4(CHD2):c.1172C>G(p.Ser391Cys) variant causes a missense change. The variant allele was found at a frequency of 0.00000633 in 1,579,814 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 (★).

Frequency

Genomes: 𝑓 0.000046 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000021 ( 0 hom. )

Consequence

CHD2
NM_001271.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 5.10

Publications

0 publications found

Variant links:

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]

CHD2 Gene-Disease associations (from GenCC):

complex neurodevelopmental disorder
Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
developmental and epileptic encephalopathy 94
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae)
Lennox-Gastaut syndrome
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
myoclonic-astatic epilepsy
Inheritance: Unknown Classification: SUPPORTIVE Submitted by: Orphanet

CHD2 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -5 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.37780014).

BS2

High AC in GnomAd4 at 7 Unknown,AD gene.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001271.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CHD2	NM_001271.4	MANE Select	c.1172C>G	p.Ser391Cys	missense	Exon 11 of 39	NP_001262.3
	CHD2	NM_001042572.3		c.1172C>G	p.Ser391Cys	missense	Exon 11 of 13	NP_001036037.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
CHD2	ENST00000394196.9	TSL:5 MANE Select	c.1172C>G	p.Ser391Cys	missense	Exon 11 of 39	ENSP00000377747.4
CHD2	ENST00000626874.2	TSL:1	c.1172C>G	p.Ser391Cys	missense	Exon 11 of 38	ENSP00000486629.1
CHD2	ENST00000420239.7	TSL:1	c.1172C>G	p.Ser391Cys	missense	Exon 11 of 13	ENSP00000406581.2

Frequencies

GnomAD3 genomes

AF:

0.0000461

AC:

AN:

152004

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000169

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000127

AC:

AN:

235420

AF XY:

0.00

show subpopulations

Gnomad AFR exome

AF:

0.000196

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS 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:

0.00000210

AC:

AN:

1427692

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

709068

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.0000620

AC:

AN:

32276

American (AMR)

AF:

0.0000246

AC:

AN:

40574

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25166

East Asian (EAS)

AF:

0.00

AC:

AN:

39220

South Asian (SAS)

AF:

0.00

AC:

AN:

80264

European-Finnish (FIN)

AF:

0.00

AC:

AN:

52856

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5626

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1092676

Other (OTH)

AF:

0.00

AC:

AN:

59034

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.0225104), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.375

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.0000460

AC:

AN:

152122

Hom.:

Cov.:

AF XY:

0.0000538

AC XY:

AN XY:

74380

show subpopulations

African (AFR)

AF:

0.000169

AC:

AN:

41494

American (AMR)

AF:

0.00

AC:

AN:

15276

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5180

South Asian (SAS)

AF:

0.00

AC:

AN:

4824

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10548

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

68008

Other (OTH)

AF:

0.00

AC:

AN:

2114

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.482

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.00

Hom.:

Bravo

AF:

0.0000491

ExAC

AF:

0.0000247

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Developmental and epileptic encephalopathy 94

Uncertain:1

Jul 12, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the gnomAD database. This sequence change replaces serine, which is neutral and polar, with cysteine, which is neutral and slightly polar, at codon 391 of the CHD2 protein (p.Ser391Cys). This variant has not been reported in the literature in individuals affected with CHD2-related conditions. ClinVar contains an entry for this variant (Variation ID: 580001). 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. 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.

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.11

BayesDel_addAF

Benign

0.0045

BayesDel_noAF

Uncertain

0.050

CADD

Pathogenic

(source)

DANN

Uncertain

0.99

DEOGEN2

Benign

0.40

Eigen

Pathogenic

0.75

Eigen_PC

Pathogenic

0.74

FATHMM_MKL

Pathogenic

1.0

LIST_S2

Uncertain

0.90

M_CAP

Benign

0.072

MetaRNN

Benign

0.38

MetaSVM

Uncertain

0.089

MutationAssessor

Uncertain

2.0

PhyloP100

5.1

PrimateAI

Uncertain

0.65

PROVEAN

Benign

-0.83

REVEL

Uncertain

0.43

Sift

Benign

0.050

Sift4G

Uncertain

0.051

Polyphen

0.99

Vest4

0.46

MutPred

0.54

Loss of disorder (P = 0.0016)

MVP

0.81

MPC

0.77

ClinPred

0.27

GERP RS

5.3

RBP_binding_hub_radar

1.0

RBP_regulation_power_radar

2.2

Varity_R

0.12

gMVP

0.51

Mutation Taster

=73/27

polymorphism

(source)

Splicing

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

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over