14-21431306-G-T

Variant names:

• chr14-21431306-G-T
• rs530700201
• NM_001170629.2:c.338C>A
• CHD8 p.Ser113*

Variant summary

Our verdict is Pathogenic. The variant received 10 ACMG points: 10P and 0B. PVS1 PM2

The NM_001170629.2(CHD8):​c.338C>A​(p.Ser113*) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. S113S) has been classified as Likely benign. Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 32)
• Consequence: CHD8 NM_001170629.2 stop_gained
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 2.36
• Publications: 1 publications found

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]

CHD8 Gene-Disease associations (from GenCC):

• complex neurodevelopmental disorder

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• autism

  Inheritance: AD Classification: STRONG Submitted by: G2P
• intellectual developmental disorder with autism and macrocephaly

  Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
• intellectual disability

  Inheritance: AD Classification: STRONG Submitted by: Ambry Genetics
• congenital myasthenic syndrome

  Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics

ACMG classification

Our verdict: Pathogenic. The variant received 10 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

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001170629.2. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CHD8	NM_001170629.2	MANE Select	c.338C>A	p.Ser113*	stop_gained	Exon 2 of 38	NP_001164100.1	Q9HCK8-1
	CHD8	NM_020920.4		c.6+505C>A		intron	N/A	NP_065971.2	Q9HCK8-2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CHD8	ENST00000646647.2	MANE Select	c.338C>A	p.Ser113*	stop_gained	Exon 2 of 38	ENSP00000495240.1	Q9HCK8-1
	CHD8	ENST00000430710.8	TSL:1	c.6+505C>A		intron	N/A	ENSP00000406288.3	Q9HCK8-2
	CHD8	ENST00000557364.6	TSL:5	c.338C>A	p.Ser113*	stop_gained	Exon 2 of 38	ENSP00000451601.1	Q9HCK8-1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

Alfa AF: 0.0000297 Hom.: 0

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.54	D
BayesDel_noAF	Pathogenic	0.54
CADD	Pathogenic	35
DANN	Uncertain	0.99
Eigen	Uncertain	0.54
Eigen_PC	Uncertain	0.35
FATHMM_MKL	Uncertain	0.94	D
PhyloP100		2.4
PromoterAI		-0.032	Neutral
Mutation Taster		=0/200	disease causing (fs/PTC)

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

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Other links and lift over

dbSNP: rs530700201;

hg19: chr14-21899465;