22-26468571-G-A

Position:

chr22-26468571-G-A

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1PM2PP5_Very_Strong

The ENST00000398145.7(HPS4):c.649C>T(p.Arg217Ter) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000428 in 1,613,944 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★). Variant results in nonsense mediated mRNA decay.

Frequency

Genomes: 𝑓 0.000039 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000043 ( 0 hom. )

Consequence

HPS4
ENST00000398145.7 stop_gained

Scores

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:7

Conservation

PhyloP100: 0.509

Variant links:

Genes affected

HPS4 (HGNC:15844): (HPS4 biogenesis of lysosomal organelles complex 3 subunit 2) This gene encodes a protein component of biogenesis of lysosome-related organelles complexes (BLOC). BLOC complexes are important for the formation of endosomal-lysosomal organelles such as melanosomes and platelet dense granules. Mutations in this gene result in subtype 4 of Hermansky-Pudlak syndrome, a form of albinism. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Aug 2012]

HPS4 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 18 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;

PP5

Variant 22-26468571-G-A is Pathogenic according to our data. Variant chr22-26468571-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 4130.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr22-26468571-G-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
HPS4	NM_022081.6 linkuse as main transcript	c.649C>T	p.Arg217Ter	stop_gained	8/14	ENST00000398145.7	NP_071364.4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
HPS4	ENST00000398145.7 linkuse as main transcript	c.649C>T	p.Arg217Ter	stop_gained	8/14	1	NM_022081.6	ENSP00000381213	P2	Q9NQG7-1

Frequencies

GnomAD3 genomes

AF:

0.0000394

AC:

AN:

152172

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

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:

0.0000735

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000359

AC:

AN:

250768

Hom.:

AF XY:

0.0000369

AC XY:

AN XY:

135616

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000579

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000617

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000431

AC:

AN:

1461772

Hom.:

Cov.:

AF XY:

0.0000481

AC XY:

AN XY:

727180

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000447

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.0000375

Gnomad4 NFE exome

AF:

0.0000522

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

AF:

0.0000394

AC:

AN:

152172

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74336

show subpopulations

Gnomad4 AFR

AF:

0.0000241

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:

0.0000735

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000111

Hom.:

Bravo

AF:

0.0000227

ExAC

AF:

0.0000330

AC:

EpiCase

AF:

0.0000545

EpiControl

AF:

0.000119

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:7

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Hermansky-Pudlak syndrome 4

Pathogenic:4

Pathogenic, criteria provided, single submitter	clinical testing	Baylor Genetics	Feb 27, 2024	- -
Likely pathogenic, criteria provided, single submitter	curation	Broad Center for Mendelian Genomics, Broad Institute of MIT and Harvard	Jan 24, 2023	The p.Arg217Ter variant in HPS4 has been reported in 4 individuals with Hermansky-Pudlak syndrome 4 (PMID: 31898847, 29600982, 12664304, 33229802), and has been identified in 0.006% (8/128820) of European (non-Finnish) chromosomes by the Genome Aggregation Database (gnomAD, http://gnomad.broadinstitute.org; dbSNP ID: rs119471023). Although this variant has been seen in the general population in a heterozygous state, its frequency is low enough to be consistent with a recessive carrier frequency. Of the 4 affected individuals, one of those was a homozygote, which increases the likelihood that the p.Arg217Ter variant is pathogenic (PMID: 12664304). This variant has also been reported in ClinVar (Variation ID#: 4130) and has been interpreted as pathogenic by Invitae, OMIM, and Institute of Human Genetics (University Hospital Muenster). This nonsense variant leads to a premature termination codon at position 217, which is predicted to lead to a truncated or absent protein. Loss of function of the HPS4 gene is strongly associated to autosomal recessive Hermansky-Pudlak syndrome 4. In summary, although additional studies are required to fully establish its clinical significance, this variant is likely pathogenic for autosomal recessive Hermansky-Pudlak syndrome 4. ACMG/AMP Criteria applied: PVS1_strong, PM3_supporting, PM2_supporting (Richards 2015). -
Pathogenic, criteria provided, single submitter	clinical testing	Revvity Omics, Revvity	Dec 14, 2022	- -
Pathogenic, no assertion criteria provided	literature only	OMIM	Jul 01, 2003	- -

See cases

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Institute of Human Genetics, University Hospital Muenster

Dec 08, 2021

ACMG categories: PVS1,PM2,PM3,PP5 -

Hermansky-Pudlak syndrome

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Oct 14, 2024

Variant summary: HPS4 c.649C>T (p.Arg217X) results in a premature termination codon, predicted to cause a truncation of the encoded protein or absence of the protein due to nonsense mediated decay, which are commonly known mechanisms for disease. The variant allele was found at a frequency of 3.6e-05 in 250768 control chromosomes. c.649C>T has been reported in the literature in individuals affected with Hermansky-Pudlak Syndrome, type 4, including as a compound heterozygous genotype (e.g. Anderson_2003). These data indicate that the variant may be associated with disease. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. ClinVar contains an entry for this variant (Variation ID: 4130). Based on the evidence outlined above, the variant was classified as pathogenic. -

not provided

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 02, 2024

This sequence change creates a premature translational stop signal (p.Arg217*) in the HPS4 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in HPS4 are known to be pathogenic (PMID: 12664304). This variant is present in population databases (rs119471023, gnomAD 0.006%). This premature translational stop signal has been observed in individual(s) with clinical features of Hermansky-Pudlak syndrome (PMID: 12664304, 29600982). This variant is also known as C837T (R217X). ClinVar contains an entry for this variant (Variation ID: 4130). For these reasons, this variant has been classified as Pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Pathogenic

0.49

BayesDel_noAF

Pathogenic

0.15

CADD

Pathogenic

DANN

Uncertain

0.99

Eigen

Benign

-0.17

Eigen_PC

Benign

-0.50

FATHMM_MKL

Benign

0.066

MutationTaster

Benign

1.0

A;A;A;A

Vest4

0.61

GERP RS

1.7

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.020

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