X-72330062-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2BP4BS1_Supporting

The NM_018486.3(HDAC8):c.1126G>A(p.Val376Met) variant causes a missense change. The variant allele was found at a frequency of 0.00000414 in 1,206,895 control chromosomes in the GnomAD database, with no homozygous occurrence. There are no hemizygote samples in GnomAD. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.000027 ( 0 hom., 0 hem., cov: 23)

Exomes 𝑓: 0.0000018 ( 0 hom. 0 hem. )

Consequence

HDAC8
NM_018486.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:2

Conservation

PhyloP100: 4.12

Variant links:

Genes affected

HDAC8 (HGNC:13315): (histone deacetylase 8) Histones play a critical role in transcriptional regulation, cell cycle progression, and developmental events. Histone acetylation/deacetylation alters chromosome structure and affects transcription factor access to DNA. The protein encoded by this gene belongs to class I of the histone deacetylase family. It catalyzes the deacetylation of lysine residues in the histone N-terminal tails and represses transcription in large multiprotein complexes with transcriptional co-repressors. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Oct 2009]

HDAC8 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 0 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.42300057).

BS1

Variant frequency is greater than expected in population nfe. gnomad4 allele frequency = 0.0000267 (3/112170) while in subpopulation NFE AF= 0.0000563 (3/53313). AF 95% confidence interval is 0.0000149. There are 0 homozygotes in gnomad4. There are 0 alleles in male gnomad4 subpopulation. Median coverage is 23. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
HDAC8	NM_018486.3 linkuse as main transcript	c.1126G>A	p.Val376Met	missense_variant	11/11	ENST00000373573.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
HDAC8	ENST00000373573.9 linkuse as main transcript	c.1126G>A	p.Val376Met	missense_variant	11/11	1	NM_018486.3	P4	Q9BY41-1

Frequencies

GnomAD3 genomes

AF:

0.0000267

AC:

AN:

112170

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

34326

show subpopulations

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:

0.0000563

Gnomad OTH

AF:

0.00

GnomAD4 exome

AF:

0.00000183

AC:

AN:

1094725

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

360203

show subpopulations

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:

0.00000238

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000267

AC:

AN:

112170

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

34326

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000563

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000712

Hom.:

Bravo

AF:

0.00000756

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Inborn genetic diseases

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Aug 05, 2023

The c.1126G>A (p.V376M) alteration is located in exon 11 (coding exon 11) of the HDAC8 gene. This alteration results from a G to A substitution at nucleotide position 1126, causing the valine (V) at amino acid position 376 to be replaced by a methionine (M). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Cornelia de Lange syndrome 5

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Oct 03, 2023

This sequence change replaces valine, which is neutral and non-polar, with methionine, which is neutral and non-polar, at codon 376 of the HDAC8 protein (p.Val376Met). This variant is present in population databases (no rsID available, gnomAD 0.009%). This variant has not been reported in the literature in individuals affected with HDAC8-related conditions. ClinVar contains an entry for this variant (Variation ID: 2142066). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt HDAC8 protein function. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.80

BayesDel_addAF

Uncertain

0.037

BayesDel_noAF

Benign

-0.18

Cadd

Benign

Dann

Uncertain

0.99

FATHMM_MKL

Uncertain

0.82

LIST_S2

Uncertain

0.87

D;D;T;T;D;T;D;D;D

M_CAP

Pathogenic

0.62

MetaRNN

Benign

0.42

T;T;T;T;T;T;T;T;T

MetaSVM

Uncertain

-0.23

MutationTaster

Benign

0.99

D;D;D;D

PrimateAI

Uncertain

0.73

Polyphen

0.016

.;B;.;.;.;.;.;.;.

Vest4

0.37, 0.41

MutPred

0.45

.;Gain of methylation at K374 (P = 0.1128);.;.;.;.;.;.;.;

MVP

0.82

MPC

1.0

ClinPred

0.81

GERP RS

5.1

Varity_R

0.38

gMVP

0.69

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over