NM_001358263.1:c.2551G>A
Variant summary
Our verdict is Pathogenic. Variant got 11 ACMG points: 11P and 0B. PM2PP2PP5_Very_Strong
The NM_001358263.1(HK1):c.2551G>A(p.Glu851Lys) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000205 in 1,461,882 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Likely pathogenic (★★).
Frequency
Consequence
NM_001358263.1 missense
Scores
Clinical Significance
Conservation
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ACMG classification
Verdict is Pathogenic. Variant got 11 ACMG points.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | Exon rank | MANE | Protein | UniProt |
---|---|---|---|---|---|---|---|---|
HK1 | NM_001358263.1 | c.2551G>A | p.Glu851Lys | missense_variant | Exon 20 of 21 | ENST00000643399.2 | NP_001345192.1 | |
HK1 | NM_000188.3 | c.2539G>A | p.Glu847Lys | missense_variant | Exon 17 of 18 | ENST00000359426.7 | NP_000179.2 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | Exon rank | TSL | MANE | Protein | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|---|
HK1 | ENST00000643399.2 | c.2551G>A | p.Glu851Lys | missense_variant | Exon 20 of 21 | NM_001358263.1 | ENSP00000494664.1 | |||
HK1 | ENST00000359426.7 | c.2539G>A | p.Glu847Lys | missense_variant | Exon 17 of 18 | 1 | NM_000188.3 | ENSP00000352398.6 |
Frequencies
GnomAD3 genomes Cov.: 32
GnomAD3 exomes AF: 0.0000119 AC: 3AN: 251396Hom.: 0 AF XY: 0.00000736 AC XY: 1AN XY: 135866
GnomAD4 exome AF: 0.00000205 AC: 3AN: 1461882Hom.: 0 Cov.: 32 AF XY: 0.00000138 AC XY: 1AN XY: 727242
GnomAD4 genome Cov.: 32
ClinVar
Submissions by phenotype
Retinitis pigmentosa 79 Pathogenic:4
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The heterozygous p.Glu851Lys variant in HK1 was identified by our study in two siblings and their parent, all with Retinitis Pigmentosa. This variant has been identified in 0.001219% (3/246124) of chromosomes and by the Genome Aggregation Database (gnomAD, http://gnomad.broadinstitute.org; dbSNP rs777849213). Please note that for diseases like Retinitis Pigmentosa with clinical variability, or reduced penetrance, pathogenic variants may be present at a low frequency in the general population. Although this variant has been seen in the general population, its frequency is low enough to be consistent with the frequency of a disease with incomplete penetrance. This variant has also been reported pathogenic by OMIM in ClinVar (Variation ID: 424845). Computational prediction tools and conservation analyses suggest that this variant may impact the protein, though this information is not predictive enough to determine pathogenicity. Additional computational prediction tools suggest a missense variant in the HK1 gene may not be tolerated. The p.Glu851Lys variant in HK1 has been reported in 43 Caucasian, American, Asian, French Canadian, and Sicilian individuals with Retinitis Pigmentosa and segregated with disease in 38 affected relatives from 10 families (PMID: 25316723, 25190649, 26427411, 28765615). In summary, although additional studies are required to fully establish its clinical significance, this variant is likely pathogenic. ACMG/AMP Criteria applied: PM2, PP2, PP3, PP1_Strong (Richards 2015). -
REVEL score is 0.819 (PP3_mod). Variant is not found in gnomAD genomes (PM2). Cosegregation observed in multiple families in multiple studies (PP1_str, PMID:25316723;25190649;28765615) -
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not provided Pathogenic:3
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This sequence change replaces glutamic acid, which is acidic and polar, with lysine, which is basic and polar, at codon 847 of the HK1 protein (p.Glu847Lys). This variant is present in population databases (rs777849213, gnomAD 0.01%). This missense change has been observed in individuals with autosomal dominant retinitis pigmentosa (PMID: 25190649, 25316723, 28765615). It has also been observed to segregate with disease in related individuals. This variant is also known as p.Glu851Lys. ClinVar contains an entry for this variant (Variation ID: 424845). Invitae Evidence Modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) has been performed for this missense variant. However, the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on HK1 protein function. Experimental studies are conflicting or provide insufficient evidence to determine the effect of this variant on HK1 function (PMID: 25316723). For these reasons, this variant has been classified as Pathogenic. -
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Retinal dystrophy Pathogenic:3
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See cases Pathogenic:1
ACMG categories: PS3,PM1,PM2,PP3,PP4 -
HK1-related disorder Pathogenic:1
The HK1 c.2539G>A variant is predicted to result in the amino acid substitution p.Glu847Lys. This variant (also described as p.Glu851Lys and p.Glu882Lys in alternate transcripts) has been reported and shown to co-segregate with disease in multiple individuals and families with autosomal dominant retinitis pigmentosa 79 (RP79) and related phenotypes (Sullivan et al. 2014. PubMed ID: 25190649; Wang et al. 2014. PubMed ID: 25316723; Yuan et al. 2017. PubMed ID: 28765615; Kubota et al. 2020. PubMed ID: 32814480; Table S2, Suga et al. 2022. PubMed ID: 36284460; Table S4, Panneman et al. 2023. PubMed ID: 36819107). This variant was also reported in the homozygous state in a severely affected individual (Sullivan et al. 2014. PubMed ID: 25190649), and incomplete penetrance (~85%) has been noted in at least one family (Wang et al. 2014. PubMed ID: 25316723). One functional study showed that this variant does not affect hexokinase enzymatic activity or protein stability (Wang et al. 2014. PubMed ID: 25316723). However, these results should be considered inconclusive at this time, since it remains unresolved whether p.Glu847Lys pathogenicity is due to mechanism other than HK1 haploinsufficiency (e.g., a dominant-negative or gain-of-function effect). This variant is reported in 0.011% of alleles in individuals of East Asian descent in gnomAD and has been interpreted as pathogenic and likely pathogenic by multiple laboratories in ClinVar (https://www.ncbi.nlm.nih.gov/clinvar/variation/424845/). Taken together, this variant is interpreted as pathogenic. -
Computational scores
Source:
Splicing
Find out detailed SpliceAI scores and Pangolin per-transcript scores at