rs104894600

chr17-42541125-T-Cchr17-42541125-T-G

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PS1_Moderate PM1 PM2 PM5 PP3_Strong

The NM_000263.4(NAGLU):c.940T>C(p.Phe314Leu) 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. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another nucleotide change resulting in same amino acid change has been previously reported as Likely pathogenicin ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. F314S) has been classified as Likely pathogenic.

• Frequency: Genomes: not found (cov: 31)
• Consequence: NAGLU NM_000263.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 7.83

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.

• PS1: Transcript NM_000263.4 (NAGLU) is affected with MISSENSE_VARIANT having same AA change as one Pathogenic present in ClinVar as 1570
• PM1: In a hotspot region, there are 4 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 4 uncertain in NM_000263.4
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr17-42541126-T-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 1345828.Status of the report is criteria_provided_single_submitter, 1 stars.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.991

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
NAGLU	NM_000263.4	c.940T>C	p.Phe314Leu	missense_variant	5/6	ENST00000225927.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
NAGLU	ENST00000225927.7	c.940T>C	p.Phe314Leu	missense_variant	5/6	1	NM_000263.4	P1
NAGLU	ENST00000592454.1	c.37T>C	p.Phe13Leu	missense_variant	1/2	2
NAGLU	ENST00000591587.1	c.360-1903T>C		intron_variant		5
NAGLU	ENST00000586516.5			downstream_gene_variant		2

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 31

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.99
BayesDel_addAF	Pathogenic	0.54	D
BayesDel_noAF	Pathogenic	0.53
Cadd	Uncertain	24
Dann	Uncertain	1.0
DEOGEN2	Pathogenic	0.97	D
Eigen	Uncertain	0.23
Eigen_PC	Uncertain	0.33
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Uncertain	0.93	D
M_CAP	Pathogenic	0.39	D
MetaRNN	Pathogenic	0.99	D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Pathogenic	2.9	M
MutationTaster	Benign	1.0	D
PrimateAI	Uncertain	0.71	T
PROVEAN	Pathogenic	-5.6	D
REVEL	Pathogenic	0.87
Sift	Uncertain	0.0050	D
Sift4G	Uncertain	0.037	D
Polyphen		0.15	B
Vest4		1.0
MutPred		0.97		Loss of sheet (P = 0.1158);
MVP		0.96
MPC		0.97
ClinPred		0.95	D
GERP RS		5.0
Varity_R		0.84
gMVP		0.90

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		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: rs104894600; hg19: chr17-40693143;