14-21385752-G-A

Variant summary

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

The NM_001170629.2(CHD8):c.7607C>T(p.Pro2536Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000143 in 1,399,530 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: not found (cov: 30)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: CHD8 NM_001170629.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.00

Genes affected

CHD8 (HGNC:20153): (chromodomain helicase DNA binding protein 8) This gene encodes a member of the chromodomain-helicase-DNA binding protein family, which is characterized by a SNF2-like domain and two chromatin organization modifier domains. The encoded protein also contains brahma and kismet domains, which are common to the subfamily of chromodomain-helicase-DNA binding proteins to which this protein belongs. This gene has been shown to function in several processes that include transcriptional regulation, epigenetic remodeling, promotion of cell proliferation, and regulation of RNA synthesis. Allelic variants of this gene are associated with autism spectrum disorder. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Dec 2016]

LOC107984643 (HGNC:):

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, CHD8
• BP4: Computational evidence support a benign effect (MetaRNN=0.23365933).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CHD8	NM_001170629.2	c.7607C>T	p.Pro2536Leu	missense_variant	38/38	ENST00000646647.2
LOC107984643	XR_001750627.2	n.441+1039G>A		intron_variant, non_coding_transcript_variant
CHD8	NM_020920.4	c.6770C>T	p.Pro2257Leu	missense_variant	38/38

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CHD8	ENST00000646647.2	c.7607C>T	p.Pro2536Leu	missense_variant	38/38		NM_001170629.2	P3

Frequencies

GnomAD3 genomes Cov.: 30

GnomAD4 exome AF: 0.00000143 AC: 2 AN: 1399530 Hom.: 0 Cov.: 35 AF XY: 0.00000145 AC XY: 1 AN XY: 690270

Gnomad4 AFR exome AF: 0.00

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: 0.00000185

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 30

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Apr 12, 2023

Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports that this missense variant does not alter protein structure/function; Has not been previously published as pathogenic or benign to our knowledge -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.079
BayesDel_addAF	Uncertain	0.11	D
BayesDel_noAF	Uncertain	-0.080
Cadd	Benign	20
Dann	Uncertain	0.99
Eigen	Uncertain	0.34
Eigen_PC	Uncertain	0.37
FATHMM_MKL	Uncertain	0.83	D
M_CAP	Uncertain	0.11	D
MetaRNN	Benign	0.23	T;T;T;T;T;T
MetaSVM	Uncertain	0.37	D
MutationTaster	Benign	1.0	D;D;D
PrimateAI	Benign	0.47	T
PROVEAN	Benign	-0.65	N;N;.;.;N;.
REVEL	Uncertain	0.47
Sift	Uncertain	0.0050	D;D;.;.;D;.
Sift4G	Uncertain	0.021	D;D;.;.;D;.
Polyphen		1.0	D;.;.;D;.;.
Vest4		0.33
MutPred		0.21		.;Loss of relative solvent accessibility (P = 0.0676);Loss of relative solvent accessibility (P = 0.0676);.;Loss of relative solvent accessibility (P = 0.0676);Loss of relative solvent accessibility (P = 0.0676);
MVP		0.39
MPC		0.31
ClinPred		0.65	D
GERP RS		4.4
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.14
gMVP		0.37

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: rs1064795453; hg19: chr14-21853911;