rs566580738
Variant summary
Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PM1PM2PM5PP3_StrongPP5_Very_Strong
The NM_000520.6(HEXA):c.754C>T(p.Arg252Cys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000062 in 1,614,066 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 (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R252H) has been classified as Pathogenic.
Frequency
Consequence
NM_000520.6 missense
Scores
Clinical Significance
Conservation
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ACMG classification
Verdict is Pathogenic. Variant got 18 ACMG points.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
HEXA | NM_000520.6 | c.754C>T | p.Arg252Cys | missense_variant | 7/14 | ENST00000268097.10 | |
HEXA | NM_001318825.2 | c.787C>T | p.Arg263Cys | missense_variant | 7/14 | ||
HEXA | NR_134869.3 | n.796C>T | non_coding_transcript_exon_variant | 7/11 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
HEXA | ENST00000268097.10 | c.754C>T | p.Arg252Cys | missense_variant | 7/14 | 1 | NM_000520.6 | P1 | |
ENST00000570175.1 | n.1923G>A | non_coding_transcript_exon_variant | 3/3 | 1 |
Frequencies
GnomAD3 genomes AF: 0.0000197 AC: 3AN: 152124Hom.: 0 Cov.: 32
GnomAD3 exomes AF: 0.0000119 AC: 3AN: 251466Hom.: 0 AF XY: 0.0000221 AC XY: 3AN XY: 135904
GnomAD4 exome AF: 0.00000479 AC: 7AN: 1461824Hom.: 0 Cov.: 31 AF XY: 0.00000413 AC XY: 3AN XY: 727220
GnomAD4 genome AF: 0.0000197 AC: 3AN: 152242Hom.: 0 Cov.: 32 AF XY: 0.0000134 AC XY: 1AN XY: 74446
ClinVar
Submissions by phenotype
Tay-Sachs disease Pathogenic:8Uncertain:1
Likely pathogenic, no assertion criteria provided | clinical testing | Natera, Inc. | Sep 16, 2020 | - - |
Pathogenic, criteria provided, single submitter | clinical testing | Women's Health and Genetics/Laboratory Corporation of America, LabCorp | Sep 29, 2021 | Variant summary: HEXA c.754C>T (p.Arg252Cys) results in a non-conservative amino acid change located in the Glycoside hydrolase family 20, catalytic domain (IPR015883) of the encoded protein sequence. Other missense variant affecting this residue, such as p.Arg252His and p.Arg252Leu have been reported in patients with Tay-Sachs disease, supporting a critical role for this residue for overall function. Five of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 1.2e-05 in 251466 control chromosomes. c.754C>T has been reported in the literature as a homozygous and compound heterozygous genotype in multiple individuals affected with Tay-Sachs Disease (example, Mistri_2019, Jahnova_2019, King_2020, Mahdieh_2021). These data indicate that the variant is very likely to be associated with disease. At least one publication reports experimental evidence evaluating an impact on protein function. The most pronounced variant effect results in <10% of normal HEX-A activity with MUGS as a substrate (example, Mistri_2019). Five clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation (likely pathogenic, n=4, VUS, n=1). None of these submitters cite overlapping evidence utilized in the context of this evaluation. Based on the evidence outlined above, the variant was classified as pathogenic. - |
Likely pathogenic, criteria provided, single submitter | clinical testing | Revvity Omics, Revvity | Mar 02, 2020 | - - |
Likely pathogenic, criteria provided, single submitter | clinical testing | Genomic Research Center, Shahid Beheshti University of Medical Sciences | Dec 03, 2017 | - - |
Likely pathogenic, criteria provided, single submitter | clinical testing | Foundation for Research in Genetics and Endocrinology, FRIGE's Institute of Human Genetics | Sep 30, 2022 | The variant has shown a homozygous status for c.754C>T (p.Arg252Cys) in exon 7 of the HEXA gene. This variant is not reported in the 1000 genomes and has MAF of 0.0019% in the gnomAD database. It is reported in dbSNP database with ID of rs566580738. The in-silico prediction of the variant is disease causing by LRT, MutPred, Mutation Taster, SIFT and PROVEAN. - |
Pathogenic, criteria provided, single submitter | clinical testing | Invitae | Oct 30, 2023 | This sequence change replaces arginine, which is basic and polar, with cysteine, which is neutral and slightly polar, at codon 252 of the HEXA protein (p.Arg252Cys). This variant is present in population databases (rs566580738, gnomAD 0.006%). This missense change has been observed in individual(s) with HEXA-related diseases (PMID: 31076878; Invitae). ClinVar contains an entry for this variant (Variation ID: 522667). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt HEXA protein function with a positive predictive value of 95%. This variant disrupts the p.Arg252 amino acid residue in HEXA. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 8730294). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. For these reasons, this variant has been classified as Pathogenic. - |
Likely pathogenic, criteria provided, single submitter | research | Cardiogenetic Research Center, Rajaie Cardiovascular Medical and Research Center, Iran University of Medical Sciences | Jul 05, 2019 | - - |
Uncertain significance, no assertion criteria provided | clinical testing | Myelin Disorders Clinic-Children's Medical Center/Medical Genetics Lab-Tarbiat Modares University, Children's Medical Center, Pediatrics Center of Excellence, | - | - - |
Likely pathogenic, criteria provided, single submitter | clinical testing | Myriad Genetics, Inc. | Nov 01, 2021 | NM_000520.4(HEXA):c.754C>T(R252C) is a missense variant classified as likely pathogenic in the context of hexosaminidase A deficiency. R252C has been observed in cases with relevant disease (PMID: 31076878, 31388111, 33240792). Functional assessments of this variant are not available in the literature. R252C has been observed in population frequency databases (gnomAD: SAS 0.01%). In summary, NM_000520.4(HEXA):c.754C>T(R252C) is a missense variant that has been observed more frequently in cases with the relevant disease than in healthy populations. Please note: this variant was assessed in the context of healthy population screening. - |
Computational scores
Source:
Splicing
Find out detailed SpliceAI scores and Pangolin per-transcript scores at