rs796052123

Positions:

• chr17-42536639-G-T

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_000263.4(NAGLU):​c.367G>T​(p.Glu123Ter) variant causes a stop gained change. 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 (★). Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: NAGLU NM_000263.4 stop_gained
• Clinical Significance: Pathogenic criteria provided, single submitter P:1 U:1
• Conservation: PhyloP100: 3.61

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]

ACMG classification

Verdict is Pathogenic. Variant got 12 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 17-42536639-G-T is Pathogenic according to our data. Variant chr17-42536639-G-T is described in ClinVar as [Pathogenic]. Clinvar id is 204586.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
NAGLU	NM_000263.4	c.367G>T	p.Glu123Ter	stop_gained	1/6	ENST00000225927.7
NAGLU	XM_024450771.2	c.367G>T	p.Glu123Ter	stop_gained	1/7
NAGLU	XM_047436138.1	c.-95G>T		5_prime_UTR_variant	1/5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
NAGLU	ENST00000225927.7	c.367G>T	p.Glu123Ter	stop_gained	1/6	1	NM_000263.4	P1
NAGLU	ENST00000586516.5	c.119G>T	p.Arg40Leu	missense_variant	1/4	2
NAGLU	ENST00000591587.1	c.110G>T	p.Arg37Leu	missense_variant	1/4	5

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1347364 Hom.: 0 Cov.: 30 AF XY: 0.00 AC XY: 0 AN XY: 664082

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1 Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Mucopolysaccharidosis, MPS-III-B;C5569050:Charcot-Marie-Tooth disease axonal type 2V Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Invitae

Jun 30, 2020

This variant has been observed in individual(s) with late-onset painful sensory polyneuropathy (PMID: 25818867). ClinVar contains an entry for this variant (Variation ID: 204586). For these reasons, this variant has been classified as Pathogenic. Loss-of-function variants in NAGLU are known to be pathogenic (PMID: 9832037, 10094189, 16151907). The frequency data for this variant in the population databases is considered unreliable, as metrics indicate insufficient coverage at this position in the ExAC database. This sequence change creates a premature translational stop signal (p.Glu123*) in the NAGLU gene. It is expected to result in an absent or disrupted protein product. -

not provided Uncertain:1

Uncertain significance, no assertion criteria provided

literature only

OMIM

Jun 01, 2015

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.66	D
BayesDel_noAF	Pathogenic	0.50
CADD	Pathogenic	39
DANN	Uncertain	0.99
Eigen	Pathogenic	0.80
Eigen_PC	Pathogenic	0.67
FATHMM_MKL	Pathogenic	0.97	D
MutationTaster	Benign	1.0	A
Vest4		0.48
GERP RS		4.5
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.10		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs796052123; hg19: chr17-40688657;