NM_152419.3:c.30G>A

Variant names:

• chr8-43140526-G-A
• NM_152419.3:c.30G>A

Variant summary

Our verdict is Likely benign. Variant got -3 ACMG points: 2P and 5B. PM2 BP4_Strong BP7

The NM_152419.3(HGSNAT):​c.30G>A​(p.Ala10Ala) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000626 in 958,014 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000063 (0 hom.)
• Consequence: HGSNAT NM_152419.3 synonymous
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1 B:1
• Conservation: PhyloP100: 0.718

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]

ACMG classification

Verdict is Likely_benign. Variant got -3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.57).
• BP7: Synonymous conserved (PhyloP=0.718 with no splicing effect.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
HGSNAT	NM_152419.3	c.30G>A	p.Ala10Ala	synonymous_variant	Exon 1 of 18	ENST00000379644.9	NP_689632.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
HGSNAT	ENST00000379644.9	c.30G>A	p.Ala10Ala	synonymous_variant	Exon 1 of 18	2	NM_152419.3	ENSP00000368965.4
HGSNAT	ENST00000520704.1	n.-121G>A		non_coding_transcript_exon_variant	Exon 1 of 10	1		ENSP00000429109.1
HGSNAT	ENST00000520704.1	n.-121G>A		5_prime_UTR_variant	Exon 1 of 10	1		ENSP00000429109.1
HGSNAT	ENST00000517319.1	n.30G>A		non_coding_transcript_exon_variant	Exon 1 of 5	4		ENSP00000430032.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000626 AC: 6 AN: 958014 Hom.: 0 Cov.: 29 AF XY: 0.00000664 AC XY: 3 AN XY: 451760

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.000109

Gnomad4 EAS exome AF: 0.000355

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.: 32

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:1 Benign:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Retinal dystrophy Pathogenic:1

Oct 01, 2023

Dept Of Ophthalmology, Nagoya University

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: research

- -

Mucopolysaccharidosis, MPS-III-C;C4225287:Retinitis pigmentosa 73 Benign:1

Nov 10, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.57
CADD	Benign	12
DANN	Benign	0.86
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.0

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr8-42995669;