Genetic Variant HAP1:p.Trp593Cys (chr17-41724782-C-G) – ACMG Classification: Uncertain_significance (0 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_177977.3(HAP1):c.1779G>C(p.Trp593Cys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000011 in 1,458,974 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.000011 ( 0 hom. )

Consequence

HAP1
NM_177977.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 1.35

Publications

0 publications found

Variant links:

Genes affected

HAP1 (HGNC:4812): (huntingtin associated protein 1) Huntington's disease (HD), a neurodegenerative disorder characterized by loss of striatal neurons, is caused by an expansion of a polyglutamine tract in the HD protein huntingtin. This gene encodes a protein that interacts with huntingtin, with two cytoskeletal proteins (dynactin and pericentriolar autoantigen protein 1), and with a hepatocyte growth factor-regulated tyrosine kinase substrate. The interactions with cytoskeletal proteins and a kinase substrate suggest a role for this protein in vesicular trafficking or organelle transport. Several alternatively spliced transcript variants encoding different isoforms have been described for this gene. [provided by RefSeq, Jul 2008]

HAP1 links:

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ACMG classification

Classification was made for transcript

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

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.11472687).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
HAP1	NM_177977.3 link	c.1779G>C	p.Trp593Cys	missense_variant	Exon 11 of 11	ENST00000347901.9	NP_817084.2	P54257-2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
HAP1	ENST00000347901.9 link	c.1779G>C	p.Trp593Cys	missense_variant	Exon 11 of 11	1	NM_177977.3	ENSP00000334002.4		P54257-2

Frequencies

GnomAD3 genomes

Cov.:

GnomAD2 exomes

AF:

0.0000120

AC:

AN:

250296

AF XY:

0.00000739

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000264

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000110

AC:

AN:

1458974

Hom.:

Cov.:

AF XY:

0.0000110

AC XY:

AN XY:

725474

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33460

American (AMR)

AF:

0.00

AC:

AN:

44680

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26110

East Asian (EAS)

AF:

0.00

AC:

AN:

39640

South Asian (SAS)

AF:

0.00

AC:

AN:

86238

European-Finnish (FIN)

AF:

0.00

AC:

AN:

52300

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5748

European-Non Finnish (NFE)

AF:

0.0000135

AC:

AN:

1110510

Other (OTH)

AF:

0.0000166

AC:

AN:

60288

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.472

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

Alfa

AF:

0.0000434

Hom.:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Apr 14, 2025

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.1779G>C (p.W593C) alteration is located in exon 11 (coding exon 11) of the HAP1 gene. This alteration results from a G to C substitution at nucleotide position 1779, causing the tryptophan (W) at amino acid position 593 to be replaced by a cysteine (C). 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

Benign

0.25

BayesDel_addAF

Benign

-0.19

BayesDel_noAF

Benign

-0.50

CADD

Benign

(source)

DANN

Benign

0.76

DEOGEN2

Benign

0.050

.;.;.;.;.;T

Eigen

Benign

-0.49

Eigen_PC

Benign

-0.52

FATHMM_MKL

Benign

0.44

LIST_S2

Benign

0.64

T;T;T;T;T;T

M_CAP

Benign

0.0047

MetaRNN

Benign

0.11

T;T;T;T;T;T

MetaSVM

Benign

-1.0

MutationAssessor

Benign

0.0

.;.;.;.;.;N

PhyloP100

1.4

PrimateAI

Benign

0.37

PROVEAN

Pathogenic

-5.6

D;D;N;N;N;N

REVEL

Benign

0.061

Sift

Uncertain

0.018

D;D;D;D;D;D

Sift4G

Uncertain

0.022

D;T;D;D;D;D

Polyphen

0.46, 0.68, 0.55

.;.;P;P;P;P

Vest4

0.18, 0.20, 0.19, 0.15

MutPred

0.43

.;.;.;.;.;Loss of catalytic residue at L643 (P = 0.0049);

MVP

0.52

MPC

0.18

ClinPred

0.22

GERP RS

2.4

PromoterAI

-0.013

Neutral

(source)

Varity_R

0.065

gMVP

0.045

Mutation Taster

=99/1

polymorphism

(source)

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

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17-41724782-C-G

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over