rs761607612

Positions:

• chr17-80214757-C-T

Variant summary

Our verdict is Pathogenic. Variant got 14 ACMG points: 14P and 0B. PM2 PP3_Strong PP5_Very_Strong

The NM_000199.5(SGSH):​c.364G>A​(p.Gly122Arg) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000164 in 1,459,646 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.000016 (0 hom.)
• Consequence: SGSH NM_000199.5 missense
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:12
• Conservation: PhyloP100: 7.76

Genes affected

SGSH (HGNC:10818): (N-sulfoglucosamine sulfohydrolase) This gene encodes the enzyme sulfamidase; one of several enzymes involved in the lysosomal degradation of heparan sulfate. Mutations in this gene are associated with the lysosomal storage disease mucopolysaccaridosis IIIA, also known as Sanfilippo syndrome A, which results from impaired degradation of heparan sulfate. Transcripts of varying sizes have been reported but their biological validity has not been determined. [provided by RefSeq, Jun 2017]

SGSH (HGNC:):

ACMG classification

Verdict is Pathogenic. Variant got 14 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.994
• PP5: Variant 17-80214757-C-T is Pathogenic according to our data. Variant chr17-80214757-C-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 518269.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr17-80214757-C-T is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SGSH	NM_000199.5	c.364G>A	p.Gly122Arg	missense_variant	4/8	ENST00000326317.11	NP_000190.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SGSH	ENST00000326317.11	c.364G>A	p.Gly122Arg	missense_variant	4/8	1	NM_000199.5	ENSP00000314606.6

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD3 exomes AF: 0.0000161 AC: 4 AN: 249012 Hom.: 0 AF XY: 0.0000222 AC XY: 3 AN XY: 135064

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.000131

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000164 AC: 24 AN: 1459646 Hom.: 0 Cov.: 33 AF XY: 0.0000275 AC XY: 20 AN XY: 726192

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: 0.000185

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000719

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

Bravo AF: 0.00000756

ExAC AF: 0.0000165 AC: 2

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:12

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Mucopolysaccharidosis, MPS-III-A Pathogenic:9

Likely pathogenic, criteria provided, single submitter	clinical testing	Counsyl	Jan 24, 2018	- -
Pathogenic, criteria provided, single submitter	clinical testing	Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center	Sep 21, 2015	- -
Pathogenic, no assertion criteria provided	clinical testing	Diagnostic Laboratory, Department of Genetics, University Medical Center Groningen	-	- -
Likely pathogenic, criteria provided, single submitter	clinical testing	Genome-Nilou Lab	Nov 07, 2021	- -
Pathogenic, criteria provided, single submitter	clinical testing	Baylor Genetics	Jun 15, 2023	- -
Pathogenic, no assertion criteria provided	clinical testing	Natera, Inc.	Feb 22, 2021	- -
Likely pathogenic, criteria provided, single submitter	literature only	Laboratory of Diagnosis and Therapy of Lysosomal Disorders, University of Padova	Jan 01, 2019	PS3: Low in vitro enzymatic activity. PM2: Very low frequency in ExAc -
Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 12, 2024	This sequence change replaces glycine, which is neutral and non-polar, with arginine, which is basic and polar, at codon 122 of the SGSH protein (p.Gly122Arg). This variant is present in population databases (rs761607612, gnomAD 0.01%). This missense change has been observed in individuals with mucopolysaccharidosis (PMID: 9401012, 9554748, 11182930, 21061399, 22976768, 27590925; Invitae). ClinVar contains an entry for this variant (Variation ID: 518269). 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 SGSH protein function with a positive predictive value of 95%. Experimental studies have shown that this missense change affects SGSH function (PMID: 10727844). This variant disrupts the p.Arg122 amino acid residue in SGSH. Other variant(s) that disrupt this residue have been observed in individuals with SGSH-related conditions (PMID: 24875751), which suggests that this may be a clinically significant amino acid residue. For these reasons, this variant has been classified as Pathogenic. -
Pathogenic, criteria provided, single submitter	clinical testing	Centre for Inherited Metabolic Diseases, Karolinska University Hospital	Mar 25, 2021	- -

not provided Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Mayo Clinic Laboratories, Mayo Clinic	Nov 27, 2023	PP1, PP3, PP4, PM2_moderate, PM3_strong, PS3, PS4_moderate -
Pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Aug 05, 2021	Published functional studies demonstrate a damaging effect on enzyme activity (Esposito et al., 2000); In silico analysis, which includes protein predictors and evolutionary conservation, supports a deleterious effect; Not observed at significant frequency in large population cohorts (Lek et al., 2016); This variant is associated with the following publications: (PMID: 9401012, 9554748, 11182930, 11668611, 21204211, 22002444, 24875751, 30809705, 10727844, 22976768, 27590925, 21061399, 25557439, 25807448, 24816101) -

Abnormality of metabolism/homeostasis Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Kariminejad - Najmabadi Pathology & Genetics Center

Jul 10, 2021

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.98
BayesDel_addAF	Pathogenic	0.40	D
BayesDel_noAF	Pathogenic	0.58
CADD	Pathogenic	34
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.95	D;D;.
Eigen	Uncertain	0.45
Eigen_PC	Uncertain	0.25
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Pathogenic	0.98	D;D;D
M_CAP	Pathogenic	0.80	D
MetaRNN	Pathogenic	0.99	D;D;D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Pathogenic	4.0	H;.;.
PrimateAI	Uncertain	0.78	T
PROVEAN	Pathogenic	-7.3	D;.;.
REVEL	Pathogenic	0.94
Sift	Pathogenic	0.0	D;.;.
Sift4G	Uncertain	0.0020	D;.;.
Polyphen		1.0	D;.;.
Vest4		0.99
MutPred		0.98		Gain of MoRF binding (P = 0.0311);.;.;
MVP		0.98
MPC		0.84
ClinPred		1.0	D
GERP RS		2.8
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.98
gMVP		0.99

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.47		Details are displayed if max score is > 0.2
DS_AG_spliceai		0.47		Position offset: -2

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

Publications

LitVar

Other links and lift over

dbSNP: rs761607612; hg19: chr17-78188556;