rs762031686
Variant summary
Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1PM2PP5_Very_Strong
The NM_000263.4(NAGLU):c.1674C>G(p.Tyr558Ter) variant causes a stop gained 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 Likely pathogenic (★★). Synonymous variant affecting the same amino acid position (i.e. Y558Y) has been classified as Likely benign.
Frequency
Genomes: not found (cov: 33)
Consequence
NAGLU
NM_000263.4 stop_gained
NM_000263.4 stop_gained
Scores
2
5
Clinical Significance
Conservation
PhyloP100: -1.75
Genes affected
NAGLU (HGNC:7632): (N-acetyl-alpha-glucosaminidase) This gene encodes an enzyme that degrades heparan sulfate by hydrolysis of terminal N-acetyl-D-glucosamine residues in N-acetyl-alpha-D-glucosaminides. Defects in this gene are the cause of mucopolysaccharidosis type IIIB (MPS-IIIB), also known as Sanfilippo syndrome B. This disease is characterized by the lysosomal accumulation and urinary excretion of heparan sulfate. [provided by RefSeq, Jul 2008]
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ACMG classification
Classification made for transcript
Verdict is Pathogenic. Variant got 18 ACMG points.
PVS1
?
Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most exon, not predicted to undergo nonsense mediated mRNA decay. There are 65 pathogenic variants in the truncated region.
PM2
?
Very rare variant in population databases, with high coverage;
PP5
?
Variant 17-42543680-C-G is Pathogenic according to our data. Variant chr17-42543680-C-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 558459.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr17-42543680-C-G is described in Lovd as [Pathogenic].
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
NAGLU | NM_000263.4 | c.1674C>G | p.Tyr558Ter | stop_gained | 6/6 | ENST00000225927.7 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
NAGLU | ENST00000225927.7 | c.1674C>G | p.Tyr558Ter | stop_gained | 6/6 | 1 | NM_000263.4 | P1 | |
NAGLU | ENST00000591587.1 | c.*643C>G | 3_prime_UTR_variant | 4/4 | 5 |
Frequencies
GnomAD3 genomes ? Cov.: 33
GnomAD3 genomes
?
Cov.:
33
GnomAD4 exome Cov.: 32
GnomAD4 exome
Cov.:
32
GnomAD4 genome ? Cov.: 33
GnomAD4 genome
?
Cov.:
33
ClinVar
Significance: Pathogenic/Likely pathogenic
Submissions summary: Pathogenic:2
Revision: criteria provided, multiple submitters, no conflicts
LINK: link
Submissions by phenotype
Mucopolysaccharidosis, MPS-III-B Pathogenic:1
Likely pathogenic, criteria provided, single submitter | clinical testing | Counsyl | May 23, 2018 | - - |
Mucopolysaccharidosis, MPS-III-B;C5569050:Charcot-Marie-Tooth disease axonal type 2V Pathogenic:1
Pathogenic, criteria provided, single submitter | clinical testing | Invitae | Jan 13, 2023 | ClinVar contains an entry for this variant (Variation ID: 558459). For these reasons, this variant has been classified as Pathogenic. This variant disrupts a region of the NAGLU protein in which other variant(s) (p.Val724Glyfs*32) have been determined to be pathogenic (PMID: 10094189; Invitae). This suggests that this is a clinically significant region of the protein, and that variants that disrupt it are likely to be disease-causing. This premature translational stop signal has been observed in individual(s) with mucopolysaccharidosis type III (PMID: 21910976). This variant is not present in population databases (gnomAD no frequency). This sequence change creates a premature translational stop signal (p.Tyr558*) in the NAGLU gene. While this is not anticipated to result in nonsense mediated decay, it is expected to disrupt the last 186 amino acid(s) of the NAGLU protein. - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
BayesDel_addAF
Pathogenic
D
BayesDel_noAF
Pathogenic
Cadd
Benign
Dann
Benign
Eigen
Benign
Eigen_PC
Benign
FATHMM_MKL
Benign
N
MutationTaster
Benign
D
Vest4
GERP RS
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