14-21385470-ATTTTTT-ATTT

Variant names:

• chr14-21385470-ATTT-A
• rs370612022
• NM_001170629.2:c.*140_*142delAAA

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 0P and 0B.

The NM_001170629.2(CHD8):​c.*140_*142delAAA variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00032 in 933,058 control chromosomes in the GnomAD database, with no homozygous occurrence. There is a variant allele frequency bias in the population database for this variant (GnomAdExome4), which may indicate mosaicism or somatic mutations in the reference population data. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: 𝑓 0.0 (0 hom., cov: 31)
  • Exomes 𝑓: 0.00032 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: CHD8 NM_001170629.2 3_prime_UTR
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 2.17
• Publications: 0 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

ENSG00000260830 (HGNC:):

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

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.*140_*142delAAA		3_prime_UTR	Exon 38 of 38	NP_001164100.1	Q9HCK8-1
	CHD8	NM_020920.4		c.*140_*142delAAA		3_prime_UTR	Exon 38 of 38	NP_065971.2	Q9HCK8-2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CHD8	ENST00000646647.2	MANE Select	c.*140_*142delAAA		3_prime_UTR	Exon 38 of 38	ENSP00000495240.1	Q9HCK8-1
	CHD8	ENST00000430710.8	TSL:1	c.*140_*142delAAA		3_prime_UTR	Exon 38 of 38	ENSP00000406288.3	Q9HCK8-2
	CHD8	ENST00000864429.1		c.*140_*142delAAA		3_prime_UTR	Exon 38 of 38	ENSP00000534488.1

Frequencies

GnomAD3 genomes AF: 0.00 AC: 0 AN: 138820 Hom.: 0 Cov.: 31

Gnomad AFR AF: 0.00

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

GnomAD4 exome AF: 0.000320 AC: 299 AN: 933058 Hom.: 0 AF XY: 0.000330 AC XY: 151 AN XY: 456958

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

African (AFR) AF: 0.000500 AC: 11 AN: 22014

American (AMR) AF: 0.000364 AC: 6 AN: 16472

Ashkenazi Jewish (ASJ) AF: 0.000324 AC: 5 AN: 15428

East Asian (EAS) AF: 0.000333 AC: 10 AN: 30040

South Asian (SAS) AF: 0.000593 AC: 27 AN: 45534

European-Finnish (FIN) AF: 0.000192 AC: 5 AN: 26010

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 2754

European-Non Finnish (NFE) AF: 0.000296 AC: 217 AN: 734288

Other (OTH) AF: 0.000444 AC: 18 AN: 40518

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 138820 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 67064

African (AFR) AF: 0.00 AC: 0 AN: 38032

American (AMR) AF: 0.00 AC: 0 AN: 13880

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3276

East Asian (EAS) AF: 0.00 AC: 0 AN: 4888

South Asian (SAS) AF: 0.00 AC: 0 AN: 4380

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 8010

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 296

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 63292

Other (OTH) AF: 0.00 AC: 0 AN: 1894

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		2.2

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

Other links and lift over

dbSNP: rs370612022; hg19: chr14-21853629;