chr10-98427229-TG-T
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Variant summary
Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1PM2PP5_Very_Strong
The NM_000195.5(HPS1):c.972delC(p.Met325TrpfsTer6) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000534 in 1,535,616 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: 𝑓 0.00012 ( 0 hom., cov: 33)
Exomes 𝑓: 0.000046 ( 0 hom. )
Consequence
HPS1
NM_000195.5 frameshift
NM_000195.5 frameshift
Scores
Not classified
Clinical Significance
Conservation
PhyloP100: 0.721
Genes affected
HPS1 (HGNC:5163): (HPS1 biogenesis of lysosomal organelles complex 3 subunit 1) This gene encodes a protein that may play a role in organelle biogenesis associated with melanosomes, platelet dense granules, and lysosomes. The encoded protein is a component of three different protein complexes termed biogenesis of lysosome-related organelles complex (BLOC)-3, BLOC4, and BLOC5. Mutations in this gene are associated with Hermansky-Pudlak syndrome type 1. Alternative splicing results in multiple transcript variants. A pseudogene related to this gene is located on chromosome 22. [provided by RefSeq, Aug 2015]
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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 10-98427229-TG-T is Pathogenic according to our data. Variant chr10-98427229-TG-T is described in ClinVar as [Pathogenic]. Clinvar id is 5280.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr10-98427229-TG-T is described in Lovd as [Pathogenic]. Variant chr10-98427229-TG-T is described in Lovd as [Pathogenic]. Variant chr10-98427229-TG-T is described in Lovd as [Pathogenic].
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | Exon rank | MANE | Protein | UniProt |
---|---|---|---|---|---|---|---|---|
HPS1 | NM_000195.5 | c.972delC | p.Met325TrpfsTer6 | frameshift_variant | Exon 11 of 20 | ENST00000361490.9 | NP_000186.2 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | Exon rank | TSL | MANE | Protein | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|---|
HPS1 | ENST00000361490.9 | c.972delC | p.Met325TrpfsTer6 | frameshift_variant | Exon 11 of 20 | 1 | NM_000195.5 | ENSP00000355310.4 | ||
ENSG00000289758 | ENST00000699159.1 | n.*331delC | non_coding_transcript_exon_variant | Exon 10 of 24 | ENSP00000514167.1 | |||||
ENSG00000289758 | ENST00000699159.1 | n.*331delC | 3_prime_UTR_variant | Exon 10 of 24 | ENSP00000514167.1 |
Frequencies
GnomAD3 genomes AF: 0.000125 AC: 19AN: 151930Hom.: 0 Cov.: 33
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GnomAD4 exome AF: 0.0000455 AC: 63AN: 1383570Hom.: 0 Cov.: 30 AF XY: 0.0000425 AC XY: 29AN XY: 682764
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GnomAD4 genome AF: 0.000125 AC: 19AN: 152046Hom.: 0 Cov.: 33 AF XY: 0.000175 AC XY: 13AN XY: 74330
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ClinVar
Significance: Pathogenic
Submissions summary: Pathogenic:10Other:1
Revision: criteria provided, multiple submitters, no conflicts
LINK: link
Submissions by phenotype
Hermansky-Pudlak syndrome 1 Pathogenic:5Other:1
Pathogenic, criteria provided, single submitter | clinical testing | Fulgent Genetics, Fulgent Genetics | Mar 08, 2024 | - - |
not provided, no classification provided | literature only | GeneReviews | - | - - |
Pathogenic, criteria provided, single submitter | clinical testing | Genome-Nilou Lab | Jun 10, 2021 | - - |
Pathogenic, no assertion criteria provided | literature only | OMIM | Mar 01, 1998 | - - |
Pathogenic, criteria provided, single submitter | clinical testing | Baylor Genetics | Feb 14, 2024 | - - |
Pathogenic, criteria provided, single submitter | clinical testing | ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories | Jul 26, 2024 | The HPS1 c.972del; p.Met325TrpfsTer6 variant (rs281865082, ClinVar Variation ID: 5280) is reported compound heterozygous in the literature in multiple individuals affected with Hermansky-Pudlak syndrome (Liu 2021, O’Brien 2021). This variant is found in the general population with an overall allele frequency of 0.02% (28/175,586 alleles) in the Genome Aggregation Database (v2.1.1), but is considered a low confidence variant in the database. This variant causes a frameshift by deleting a single nucleotide, so it is predicted to result in a truncated protein or mRNA subject to nonsense-mediated decay. Based on available information, this variant is considered to be pathogenic. References: Liu T et al. Genetic variants and mutational spectrum of Chinese Hermansky-Pudlak syndrome patients. Pigment Cell Melanoma Res. 2021 Jan;34(1):111-121. PMID: 32725903. O'Brien KJ et al. Inflammatory bowel disease in Hermansky-Pudlak syndrome: a retrospective single-centre cohort study. J Intern Med. 2021 Jul;290(1):129-140. PMID: 33423334. - |
Hermansky-Pudlak syndrome Pathogenic:2
Pathogenic, no assertion criteria provided | clinical testing | Natera, Inc. | Sep 16, 2020 | - - |
Pathogenic, criteria provided, single submitter | curation | Broad Center for Mendelian Genomics, Broad Institute of MIT and Harvard | Nov 29, 2021 | The p.Met325fs (c.972del) variant in HPS1 has been reported in at least 4 individuals with Hermansky-Pudlak syndrome (PMID: 27593200, 19334085, 9705234, 9497254), segregated with disease in 2 affected relatives from 2 families (PMID: 19334085, 9705234) and has been identified in 0.09% (15/17454) of European (Finnish) chromosomes by the Genome Aggregation Database (gnomAD, http://gnomad.broadinstitute.org; dbSNP ID: rs281865083). Although this variant has been seen in the general population in a heterozygous state, its frequency is not high enough to rule out a pathogenic role. It is of note that this variant occurs in a homopolymer repeat, which could indicate that it exists as an artifact from sequencing. However, disease-causing variants have been reported in homopolymer regions, so this is not enough to rule out a pathogenic role. Of the 4 affected individuals, 1 was compound heterozygote that carried a reported pathogenic variant in trans, which increases the likelihood that the p.Met325fs variant is pathogenic (VariationID: 21091; PMID: 9705234). This variant has also been reported in ClinVar (Variation ID#: 5280) and has been interpreted as pathogenic by Invitae, Nilou-Genome Lab, OMIM, Natera, Inc., and GeneReviews. In vitro functional studies provide some evidence that the p.Met325fs variant may impact protein function (PMID: 9705234). However, these types of assays may not accurately represent biological function. This variant is predicted to cause a frameshift, which alters the protein’s amino acid sequence beginning at position 325 and leads to a premature termination codon 6 amino acids downstream. This alteration is then predicted to lead to a truncated or absent protein. Loss of function of the HPS1 gene is an established disease mechanism in autosomal recessive Hermansky-Pudlak syndrome. In summary, this variant meets criteria to be classified as pathogenic for autosomal recessive Hermansky-Pudlak syndrome. ACMG/AMP Criteria applied: PM3, PP1, PVS1 , PS3_moderate (Richards 2015). - |
not provided Pathogenic:2
Pathogenic, criteria provided, single submitter | clinical testing | Genetic Services Laboratory, University of Chicago | Jul 09, 2019 | DNA sequence analysis of the HPS1 gene demonstrated a one base pair deletion in exon 11, c.972del. This sequence change results in an amino acid frameshift and creates a premature stop codon 5 amino acids downstream of the sequence change, p.Met325Trpfs*6. This sequence change is predicted to result in an abnormal transcript, which may be degraded, or may lead to the production of a truncated HPS1 protein with potentially abnormal function. This sequence change has been described in the gnomAD database with a population frequency of 0.012% in African subpopulation (dbSNP rs281865082). This sequence change has previously been described in patients with Hermansky-Pudlak syndrome in both homozygous and compound heterozygous states (PMID: 20662851, PMID: 19334085, PMID: 8896559). Functional studies have shown results that suggest a lack of function of the protein (PMID: 21833017). These collective evidences indicate that this sequence change is pathogenic. - |
Pathogenic, criteria provided, single submitter | clinical testing | Labcorp Genetics (formerly Invitae), Labcorp | Aug 28, 2024 | This sequence change creates a premature translational stop signal (p.Met325Trpfs*6) in the HPS1 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in HPS1 are known to be pathogenic (PMID: 12442288, 16185271). The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the gnomAD database. This premature translational stop signal has been observed in individuals with Hermansky–Pudlak syndrome (PMID: 19334085, 27593200). It has also been observed to segregate with disease in related individuals. ClinVar contains an entry for this variant (Variation ID: 5280). For these reasons, this variant has been classified as Pathogenic. - |
HPS1-related disorder Pathogenic:1
Pathogenic, no assertion criteria provided | clinical testing | PreventionGenetics, part of Exact Sciences | Sep 28, 2024 | The HPS1 c.972delC variant is predicted to result in a frameshift and premature protein termination (p.Met325Trpfs*6). This variant has reported in multiple individuals with Hermansky-Pudlak syndrome (Wei et al. 2016. PubMed ID: 27593200, Table S2, Liu et al. 2020. PubMed ID: 32725903). This variant is reported in 0.086% of alleles in individuals of European (Finnish) descent in gnomAD. Frameshift variants in HPS1 are expected to be pathogenic. This variant is interpreted as pathogenic. - |
Computational scores
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SpliceAI score (max)
Details are displayed if max score is > 0.2
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