15-93020156-A-G

Variant names:

• chr15-93020156-A-G
• rs770784804
• NM_001271.4:c.5051A>G

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 3P and 3B. PM2 PP2 BP4_Moderate BP6

The NM_001271.4(CHD2):​c.5051A>G​(p.His1684Arg) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. H1684Y) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: CHD2 NM_001271.4 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1 B:1
• Conservation: PhyloP100: 8.83

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 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the CHD2 gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 57 curated pathogenic missense variants (we use a threshold of 10). The gene has 104 curated benign missense variants. Gene score misZ: 5.2052 (above the threshold of 3.09). Trascript score misZ: 6.0204 (above the threshold of 3.09). GenCC associations: The gene is linked to developmental and epileptic encephalopathy 94, complex neurodevelopmental disorder, myoclonic-astatic epilepsy, Lennox-Gastaut syndrome.
• BP4: Computational evidence support a benign effect (MetaRNN=0.2541231).
• BP6: Variant 15-93020156-A-G is Benign according to our data. Variant chr15-93020156-A-G is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 578172.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=1, Uncertain_significance=1}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CHD2	NM_001271.4	c.5051A>G	p.His1684Arg	missense_variant	Exon 38 of 39	ENST00000394196.9	NP_001262.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CHD2	ENST00000394196.9	c.5051A>G	p.His1684Arg	missense_variant	Exon 38 of 39	5	NM_001271.4	ENSP00000377747.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 35

GnomAD4 genome Cov.: 32

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1 Benign:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Inborn genetic diseases Uncertain:1

Jan 17, 2018

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.H1684R variant (also known as c.5051A>G), located in coding exon 37 of the CHD2 gene, results from an A to G substitution at nucleotide position 5051. The histidine at codon 1684 is replaced by arginine, an amino acid with highly similar properties. This amino acid position is not well conserved in available vertebrate species. In addition, the in silico prediction for this alteration is inconclusive. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Developmental and epileptic encephalopathy 94 Benign:1

Oct 18, 2018

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.14
BayesDel_addAF	Uncertain	0.075	D
BayesDel_noAF	Benign	-0.13
CADD	Benign	21
DANN	Uncertain	0.99
DEOGEN2	Benign	0.065	.;T
Eigen	Benign	0.0090
Eigen_PC	Uncertain	0.23
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Benign	0.78	T;T
M_CAP	Benign	0.041	D
MetaRNN	Benign	0.25	T;T
MetaSVM	Benign	-0.29	T
MutationAssessor	Benign	1.0	L;L
PrimateAI	Uncertain	0.60	T
PROVEAN	Benign	-0.65	.;N
REVEL	Benign	0.25
Sift	Benign	0.12	.;T
Sift4G	Benign	0.49	T;T
Polyphen		0.22	B;B
Vest4		0.35
MutPred		0.27		Gain of MoRF binding (P = 0.0517);Gain of MoRF binding (P = 0.0517);
MVP		0.74
MPC		0.42
ClinPred		0.60	D
GERP RS		5.5
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.16
gMVP		0.17

Splicing

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

Publications

LitVar

Other links and lift over

dbSNP: rs770784804; hg19: chr15-93563386;