rs1318217031
Positions:
Variant summary
Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2PP3_Moderate
The NM_152419.3(HGSNAT):c.1042G>A(p.Val348Met) variant causes a missense change involving the alteration of a 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 Uncertain significance (★★).
Frequency
Genomes: not found (cov: 31)
Consequence
HGSNAT
NM_152419.3 missense
NM_152419.3 missense
Scores
9
6
1
Clinical Significance
Conservation
PhyloP100: 7.86
Genes affected
HGSNAT (HGNC:26527): (heparan-alpha-glucosaminide N-acetyltransferase) This gene encodes a lysosomal acetyltransferase, which is one of several enzymes involved in the lysosomal degradation of heparin sulfate. Mutations in this gene are associated with Sanfilippo syndrome C, one type of the lysosomal storage disease mucopolysaccaridosis III, which results from impaired degradation of heparan sulfate. [provided by RefSeq, Jan 2009]
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ACMG classification
Classification made for transcript
Verdict is Uncertain_significance. Variant got 4 ACMG points.
PM2
Very rare variant in population databases, with high coverage;
PP3
MetaRNN computational evidence supports a deleterious effect, 0.903
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | Protein | UniProt |
---|---|---|---|---|---|---|---|---|
HGSNAT | NM_152419.3 | c.1042G>A | p.Val348Met | missense_variant | 11/18 | ENST00000379644.9 | NP_689632.2 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Protein | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|---|
HGSNAT | ENST00000379644.9 | c.1042G>A | p.Val348Met | missense_variant | 11/18 | 2 | NM_152419.3 | ENSP00000368965 | P3 |
Frequencies
GnomAD3 genomes Cov.: 31
GnomAD3 genomes
Cov.:
31
GnomAD4 exome Cov.: 30
GnomAD4 exome
Cov.:
30
GnomAD4 genome Cov.: 31
GnomAD4 genome
Cov.:
31
Bravo
AF:
ClinVar
Significance: Uncertain significance
Submissions summary: Uncertain:2
Revision: criteria provided, multiple submitters, no conflicts
LINK: link
Submissions by phenotype
Mucopolysaccharidosis, MPS-III-C Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Undiagnosed Diseases Network, NIH | Aug 09, 2017 | Two heterozygous variants of unknown significance, c.1042G>A (p.V348M) and c.1267G>T (p.G423W) were detected in the HGSNAT gene in this individual. Whole exome sequencing and Sanger confirmation showed that the father is heterozygous for the p.V348M change, and the mother is heterozygous for the p.G423W change. Our data indicate that the two changes in HGSNAT are in trans (compound heterozygous) configuration. - |
Mucopolysaccharidosis, MPS-III-C;C4225287:Retinitis pigmentosa 73 Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Labcorp Genetics (formerly Invitae), Labcorp | Oct 03, 2023 | This sequence change replaces valine, which is neutral and non-polar, with methionine, which is neutral and non-polar, at codon 348 of the HGSNAT protein (p.Val348Met). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with HGSNAT-related conditions. ClinVar contains an entry for this variant (Variation ID: 522867). 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 HGSNAT protein function. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
BayesDel_addAF
Pathogenic
D
BayesDel_noAF
Pathogenic
CADD
Pathogenic
DANN
Uncertain
Eigen
Pathogenic
Eigen_PC
Pathogenic
FATHMM_MKL
Pathogenic
D
LIST_S2
Pathogenic
D;D;D
M_CAP
Uncertain
D
MetaRNN
Pathogenic
D;D;D
MetaSVM
Pathogenic
D
MutationTaster
Benign
D;D;D;D
PrimateAI
Uncertain
T
PROVEAN
Uncertain
D;D;D
REVEL
Pathogenic
Sift
Uncertain
D;D;D
Sift4G
Uncertain
D;D;D
Vest4
MVP
MPC
ClinPred
D
GERP RS
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