8-43140504-G-C

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_152419.3(HGSNAT):c.8G>C(p.Gly3Ala) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000676 in 147,944 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 11/18 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G3R) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.0000068 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0 ( 0 hom. )

Failed GnomAD Quality Control

Consequence

HGSNAT
NM_152419.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 0.842

Variant links:

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]

HGSNAT links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 0 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.12305817).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
HGSNAT	NM_152419.3 linkuse as main transcript	c.8G>C	p.Gly3Ala	missense_variant	1/18	ENST00000379644.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
HGSNAT	ENST00000379644.9 linkuse as main transcript	c.8G>C	p.Gly3Ala	missense_variant	1/18	2	NM_152419.3	P3	Q68CP4-2
HGSNAT	ENST00000520704.1 linkuse as main transcript	c.-143G>C		5_prime_UTR_variant, NMD_transcript_variant	1/10	1
HGSNAT	ENST00000517319.1 linkuse as main transcript	c.8G>C	p.Gly3Ala	missense_variant, NMD_transcript_variant	1/5	4

Frequencies

GnomAD3 genomes

AF:

0.00000676

AC:

AN:

147944

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000244

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD4 exome

Data not reliable, filtered out with message: AC0

AF:

0.00

AC:

AN:

899322

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

421058

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

AF:

0.00000676

AC:

AN:

147944

Hom.:

Cov.:

AF XY:

0.0000139

AC XY:

AN XY:

72030

show subpopulations

Gnomad4 AFR

AF:

0.0000244

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.00000756

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Mucopolysaccharidosis, MPS-III-C;C4225287:Retinitis pigmentosa 73

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Apr 09, 2022

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. 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 not expected to disrupt HGSNAT protein function. This variant has not been reported in the literature in individuals affected with HGSNAT-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces glycine, which is neutral and non-polar, with alanine, which is neutral and non-polar, at codon 3 of the HGSNAT protein (p.Gly3Ala). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Uncertain

0.047

BayesDel_noAF

Benign

-0.17

Cadd

Benign

8.3

Dann

Benign

0.90

Eigen

Benign

-0.85

Eigen_PC

Benign

-0.92

FATHMM_MKL

Benign

0.0048

LIST_S2

Benign

0.48

M_CAP

Uncertain

0.26

MetaRNN

Benign

0.12

MetaSVM

Benign

-0.44

MutationTaster

Benign

1.0

N;N

PrimateAI

Uncertain

0.70

PROVEAN

Benign

-0.57

REVEL

Benign

0.19

Sift

Pathogenic

0.0

Sift4G

Pathogenic

0.0

Vest4

0.087

MVP

0.47

MPC

0.11

ClinPred

0.38

GERP RS

1.9

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.0

gMVP

0.27

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over