rs121907965
Variant names:
Your query was ambiguous. Multiple possible variants found:
Variant summary
Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1PM2PP5_Very_Strong
The NM_000520.6(HEXA):c.1A>T(p.Met1?) variant causes a initiator codon change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★).
Frequency
Genomes: not found (cov: 32)
Consequence
HEXA
NM_000520.6 initiator_codon
NM_000520.6 initiator_codon
Scores
6
3
7
Clinical Significance
Conservation
PhyloP100: 1.42
Genes affected
HEXA (HGNC:4878): (hexosaminidase subunit alpha) This gene encodes a member of the glycosyl hydrolase 20 family of proteins. The encoded preproprotein is proteolytically processed to generate the alpha subunit of the lysosomal enzyme beta-hexosaminidase. This enzyme, together with the cofactor GM2 activator protein, catalyzes the degradation of the ganglioside GM2, and other molecules containing terminal N-acetyl hexosamines. Mutations in this gene lead to an accumulation of GM2 ganglioside in neurons, the underlying cause of neurodegenerative disorders termed the GM2 gangliosidoses, including Tay-Sachs disease (GM2-gangliosidosis type I). Alternative splicing results in multiple transcript variants, at least one of which encodes a preproprotein that is proteolytically processed. [provided by RefSeq, Jan 2016]
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ACMG classification
Classification made for transcript
Verdict is Pathogenic. Variant got 18 ACMG points.
PVS1
Start lost variant, next in-frame start position is after 9 pathogenic variants. Next in-frame start position is after 576 CDS bases. Genomic position: 72351229. Lost 0.362 part of the original CDS.
PM2
Very rare variant in population databases, with high coverage;
PP5
Variant 15-72375972-T-A is Pathogenic according to our data. Variant chr15-72375972-T-A is described in ClinVar as [Pathogenic]. Clinvar id is 496858.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr15-72375972-T-A is described in Lovd as [Pathogenic].
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | Exon rank | MANE | Protein | UniProt |
---|---|---|---|---|---|---|---|---|
HEXA | NM_000520.6 | c.1A>T | p.Met1? | initiator_codon_variant | Exon 1 of 14 | ENST00000268097.10 | NP_000511.2 | |
HEXA | NM_001318825.2 | c.1A>T | p.Met1? | initiator_codon_variant | Exon 1 of 14 | NP_001305754.1 | ||
HEXA | NR_134869.3 | n.43A>T | non_coding_transcript_exon_variant | Exon 1 of 11 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | Exon rank | TSL | MANE | Protein | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|---|
HEXA | ENST00000268097.10 | c.1A>T | p.Met1? | initiator_codon_variant | Exon 1 of 14 | 1 | NM_000520.6 | ENSP00000268097.6 | ||
ENSG00000260729 | ENST00000379915.4 | n.1A>T | non_coding_transcript_exon_variant | Exon 1 of 16 | 2 | ENSP00000478716.1 |
Frequencies
GnomAD3 genomes Cov.: 32
GnomAD3 genomes
Cov.:
32
GnomAD4 exome Cov.: 31
GnomAD4 exome
Cov.:
31
GnomAD4 genome Cov.: 32
GnomAD4 genome
Cov.:
32
ClinVar
Significance: Pathogenic
Submissions summary: Pathogenic:2
Revision: criteria provided, multiple submitters, no conflicts
LINK: link
Submissions by phenotype
Tay-Sachs disease Pathogenic:1
Pathogenic, criteria provided, single submitter | clinical testing | Labcorp Genetics (formerly Invitae), Labcorp | Jan 12, 2024 | This sequence change affects the initiator methionine of the HEXA mRNA. The next in-frame methionine is located at codon 193. This variant is not present in population databases (gnomAD no frequency). Disruption of the initiator codon has been observed in individual(s) with hexosaminidase A deficiency (PMID: 1532289, 21796138). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. ClinVar contains an entry for this variant (Variation ID: 496858). For these reasons, this variant has been classified as Pathogenic. - |
not provided Pathogenic:1
Pathogenic, criteria provided, single submitter | clinical testing | Eurofins Ntd Llc (ga) | Mar 02, 2017 | - - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
BayesDel_addAF
Pathogenic
D
BayesDel_noAF
Pathogenic
CADD
Benign
DANN
Benign
DEOGEN2
Benign
T;.;T;.
Eigen
Benign
Eigen_PC
Benign
FATHMM_MKL
Pathogenic
D
LIST_S2
Uncertain
D;D;D;D
M_CAP
Pathogenic
D
MetaRNN
Pathogenic
D;D;D;D
MetaSVM
Uncertain
D
PROVEAN
Benign
N;N;N;.
REVEL
Uncertain
Sift
Pathogenic
D;D;D;.
Sift4G
Benign
T;T;T;D
Polyphen
B;.;.;.
Vest4
MutPred
Loss of MoRF binding (P = 0.0663);Loss of MoRF binding (P = 0.0663);Loss of MoRF binding (P = 0.0663);Loss of MoRF binding (P = 0.0663);
MVP
ClinPred
D
GERP RS
RBP_binding_hub_radar
RBP_regulation_power_radar
Varity_R
gMVP
Splicing
Name
Calibrated prediction
Score
Prediction
SpliceAI score (max)
Details are displayed if max score is > 0.2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at