rs886041723

Variant names:

• chr11-18283870-CCAAA-C
• rs886041723
• NM_181507.2:c.2979_2982delTTTG

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_181507.2(HPS5):​c.2979_2982delTTTG​(p.Cys993TrpfsTer16) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000024 in 1,460,946 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Pathogenic (★★). Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.000024 (0 hom.)
• Consequence: HPS5 NM_181507.2 frameshift
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:6
• Conservation: PhyloP100: 2.95

Genes affected

HPS5 (HGNC:17022): (HPS5 biogenesis of lysosomal organelles complex 2 subunit 2) This gene encodes a protein that may play a role in organelle biogenesis associated with melanosomes, platelet dense granules, and lysosomes. This protein interacts with Hermansky-Pudlak syndrome 6 protein and may interact with the cytoplasmic domain of integrin, alpha-3. Mutations in this gene are associated with Hermansky-Pudlak syndrome type 5. Multiple transcript variants encoding two distinct isoforms have been identified for this gene. [provided by RefSeq, Jul 2008]

ACMG classification

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 11-18283870-CCAAA-C is Pathogenic according to our data. Variant chr11-18283870-CCAAA-C is described in ClinVar as [Pathogenic]. Clinvar id is 280536.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
HPS5	NM_181507.2	c.2979_2982delTTTG	p.Cys993TrpfsTer16	frameshift_variant	Exon 21 of 23	ENST00000349215.8	NP_852608.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
HPS5	ENST00000349215.8	c.2979_2982delTTTG	p.Cys993TrpfsTer16	frameshift_variant	Exon 21 of 23	1	NM_181507.2	ENSP00000265967.5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.0000240 AC: 35 AN: 1460946 Hom.: 0 AF XY: 0.0000234 AC XY: 17 AN XY: 726850

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: 0.0000315

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:6

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Hermansky-Pudlak syndrome 5 Pathogenic:3

Mar 30, 2024

Fulgent Genetics, Fulgent Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Mar 14, 2017

Laboratoire de Génétique Moléculaire, CHU Bordeaux

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Apr 04, 2024

Genomic Medicine Center of Excellence, King Faisal Specialist Hospital and Research Centre

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not provided Pathogenic:2

Apr 22, 2016

GeneDx

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.2979_2982delTTTG pathogenic variant in the HPS5 gene has not been reported previously as a pathogenic variant nor as a benign variant, to our knowledge. The c.2979_2982delTTTG variant causes a frameshift starting with codon Cysteine, changes this amino acid to a Tryptophan residue, and creates a premature Stop codon at position 16 of the new reading frame, denoted p.Cys993TrpfsX16. This variant is predicted to cause loss of normal protein function either through protein truncation or nonsense-mediated mRNA decay. The c.2979_2982delTTTG variant was not observed in approximately 6500 individuals of European and African American ancestry in the NHLBI Exome Sequencing Project, indicating it is not a common benign variant in these populations. We interpret c.2979_2982delTTTG as a pathogenic variant. -

Nov 09, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change creates a premature translational stop signal (p.Cys993Trpfs*16) in the HPS5 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in HPS5 are known to be pathogenic (PMID: 12548288, 15296495, 21833017, 26785811). This variant is not present in population databases (gnomAD no frequency). This premature translational stop signal has been observed in individual(s) with Hermansky-Pudlak syndrome (PMID: 28640947). ClinVar contains an entry for this variant (Variation ID: 280536). For these reasons, this variant has been classified as Pathogenic. -

Hermansky-Pudlak syndrome Pathogenic:1

Feb 01, 2019

NIHR Bioresource Rare Diseases, University of Cambridge

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: research

- -

Computational scores

Source: dbNSFP v4.3

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

LitVar

Other links and lift over

dbSNP: rs886041723; hg19: chr11-18305417;