14-21403019-G-A

Variant names:

• chr14-21403019-G-A
• rs397514551
• NM_001170629.2:c.3712C>T

Variant summary

Our verdict is Pathogenic. The variant received 14 ACMG points: 14P and 0B. PVS1 PM2 PP3_Moderate PP5_Moderate

The NM_001170629.2(CHD8):​c.3712C>T​(p.Gln1238*) variant causes a stop gained, splice region change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. 3/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Pathogenic (★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 33)
• Consequence: CHD8 NM_001170629.2 stop_gained, splice_region
• Scores: Splicing: ADA: 0.9999
• Clinical Significance: Pathogenic criteria provided, single submitter P:2
• Conservation: PhyloP100: 10.0
• Publications: 11 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 14 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
• PP3: Splicing predictors support a deleterious effect. Scorers claiming Pathogenic: dbscSNV1_ADA, dbscSNV1_RF, max_spliceai. No scorers claiming Uncertain. No scorers claiming Benign.
• PP5: Variant 14-21403019-G-A is Pathogenic according to our data. Variant chr14-21403019-G-A is described in ClinVar as Pathogenic. ClinVar VariationId is 39629.Status of the report is criteria_provided_single_submitter, 1 stars.

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

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CHD8	NM_001170629.2	MANE Select	c.3712C>T	p.Gln1238*	stop_gained splice_region	Exon 18 of 38	NP_001164100.1
	CHD8	NM_020920.4		c.2875C>T	p.Gln959*	stop_gained splice_region	Exon 18 of 38	NP_065971.2

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CHD8	ENST00000646647.2	MANE Select	c.3712C>T	p.Gln1238*	stop_gained splice_region	Exon 18 of 38	ENSP00000495240.1
	CHD8	ENST00000430710.8	TSL:1	c.2875C>T	p.Gln959*	stop_gained splice_region	Exon 18 of 38	ENSP00000406288.3
	CHD8	ENST00000557364.6	TSL:5	c.3712C>T	p.Gln1238*	stop_gained splice_region	Exon 18 of 38	ENSP00000451601.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 33

Alfa AF: 0.00 Hom.: 0

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, single submitter

Submissions by phenotype

Intellectual developmental disorder with autism and macrocephaly Pathogenic:2

Oct 05, 2021

CENTOGENE GmbH and LLC - Guiding Precision Medicine

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Dec 21, 2012

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.66
CADD	Pathogenic	63
DANN	Uncertain	1.0
Eigen	Pathogenic	1.3
Eigen_PC	Pathogenic	1.1
FATHMM_MKL	Pathogenic	1.0	D
PhyloP100		10
Vest4		0.84
ClinPred		1.0	D
GERP RS		5.3
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.0
Mutation Taster		=0/200	disease causing (fs/PTC)

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	0.98
SpliceAI score (max)		0.97		Details are displayed if max score is > 0.2
DS_DG_spliceai		0.97		Position offset: 2

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

Other links and lift over

dbSNP: rs397514551; hg19: chr14-21871178;