X-48805639-T-G

Variant names:

• chrX-48805639-T-G
• NM_006044.4:c.405T>G

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_006044.4(HDAC6):​c.405T>G​(p.Phe135Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 13/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. F135C) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 23)
• Consequence: HDAC6 NM_006044.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.644

Genes affected

HDAC6 (HGNC:14064): (histone deacetylase 6) 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 II of the histone deacetylase/acuc/apha family. It contains an internal duplication of two catalytic domains which appear to function independently of each other. This protein possesses histone deacetylase activity and represses transcription. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.06262073).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
HDAC6	NM_006044.4	c.405T>G	p.Phe135Leu	missense_variant	Exon 6 of 29	ENST00000334136.11	NP_006035.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
HDAC6	ENST00000334136.11	c.405T>G	p.Phe135Leu	missense_variant	Exon 6 of 29	1	NM_006044.4	ENSP00000334061.5

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD4 exome Cov.: 29

GnomAD4 genome Cov.: 23

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Dec 07, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.405T>G (p.F135L) alteration is located in exon 6 (coding exon 5) of the HDAC6 gene. This alteration results from a T to G substitution at nucleotide position 405, causing the phenylalanine (F) at amino acid position 135 to be replaced by a leucine (L). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.69
BayesDel_addAF	Benign	-0.17	T
BayesDel_noAF	Benign	-0.49
CADD	Benign	3.7
DANN	Benign	0.84
DEOGEN2	Benign	0.12	.;T;T;T;.;T;T;.;.;T;T;.;.;.;T;.
FATHMM_MKL	Benign	0.023	N
LIST_S2	Benign	0.75	T;.;T;.;.;.;.;.;.;.;T;T;T;T;T;T
M_CAP	Benign	0.0096	T
MetaRNN	Benign	0.063	T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T
MetaSVM	Benign	-0.96	T
MutationAssessor	Benign	-1.4	.;.;.;N;.;N;N;.;.;N;N;.;.;.;.;.
PrimateAI	Uncertain	0.59	T
PROVEAN	Benign	-0.83	N;N;N;N;.;N;N;.;.;.;.;N;.;.;N;N
REVEL	Benign	0.12
Sift	Benign	0.97	T;T;T;T;.;T;T;.;.;.;.;T;.;.;T;T
Sift4G	Benign	0.39	T;T;T;T;.;T;T;.;.;.;.;T;.;.;T;T
Polyphen		0.13, 0.40	.;.;.;B;B;B;B;B;.;B;B;B;.;.;.;.
Vest4		0.49, 0.46
MutPred		0.36		Gain of relative solvent accessibility (P = 0.09);Gain of relative solvent accessibility (P = 0.09);Gain of relative solvent accessibility (P = 0.09);Gain of relative solvent accessibility (P = 0.09);Gain of relative solvent accessibility (P = 0.09);Gain of relative solvent accessibility (P = 0.09);Gain of relative solvent accessibility (P = 0.09);Gain of relative solvent accessibility (P = 0.09);.;Gain of relative solvent accessibility (P = 0.09);Gain of relative solvent accessibility (P = 0.09);Gain of relative solvent accessibility (P = 0.09);.;.;Gain of relative solvent accessibility (P = 0.09);Gain of relative solvent accessibility (P = 0.09);
MVP		0.77
MPC		1.1
ClinPred		0.073	T
GERP RS		-4.8
Varity_R		0.040
gMVP		0.75

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

No publications associated with this variant yet.

Other links and lift over

hg19: chrX-48664046;