chr8-43158949-G-C

Variant names:

• chr8-43158949-G-C
• rs797045120
• NM_152419.3:c.398G>C

Variant summary

Our verdict is Uncertain significance. The variant received 5 ACMG points: 5P and 0B. PM2 PP3_Moderate PP5

The NM_152419.3(HGSNAT):​c.398G>C​(p.Gly133Ala) variant causes a missense 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 (no stars).

• Frequency: Genomes: not found (cov: 33)
• Consequence: HGSNAT NM_152419.3 missense
• Clinical Significance: Pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 5.22
• Publications: 8 publications found

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 Gene-Disease associations (from GenCC):

• inherited retinal dystrophy

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• mucopolysaccharidosis type 3

  Inheritance: AR Classification: DEFINITIVE Submitted by: Myriad Women’s Health
• mucopolysaccharidosis type 3C

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, Genomics England PanelApp, G2P, ClinGen, Ambry Genetics, Labcorp Genetics (formerly Invitae)
• retinitis pigmentosa 73

  Inheritance: AR Classification: STRONG, MODERATE, LIMITED Submitted by: G2P, Ambry Genetics, Labcorp Genetics (formerly Invitae)
• retinitis pigmentosa

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.927
• PP5: Variant 8-43158949-G-C is Pathogenic according to our data. Variant chr8-43158949-G-C is described in ClinVar as Pathogenic. ClinVar VariationId is 208814.Status of the report is no_assertion_criteria_provided, 0 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_152419.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	HGSNAT	NM_152419.3	MANE Select	c.398G>C	p.Gly133Ala	missense	Exon 4 of 18	NP_689632.2
	HGSNAT	NM_001363227.2		c.398G>C	p.Gly133Ala	missense	Exon 4 of 19	NP_001350156.1
	HGSNAT	NM_001363228.2		c.398G>C	p.Gly133Ala	missense	Exon 4 of 16	NP_001350157.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	HGSNAT	ENST00000379644.9	TSL:2 MANE Select	c.398G>C	p.Gly133Ala	missense	Exon 4 of 18	ENSP00000368965.4	Q68CP4-2
	HGSNAT	ENST00000520704.1	TSL:1	n.248G>C		non_coding_transcript_exon	Exon 4 of 10	ENSP00000429109.1	E5RJC4
	HGSNAT	ENST00000902460.1		c.398G>C	p.Gly133Ala	missense	Exon 4 of 19	ENSP00000572519.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 33

ClinVar

ClinVar submissions

Significance: Pathogenic

Revision: no assertion criteria provided

Pathogenic	VUS	Benign	Condition
1	-	-	Retinitis pigmentosa 73 (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.78
BayesDel_addAF	Pathogenic	0.48	D
BayesDel_noAF	Pathogenic	0.46
CADD	Pathogenic	26
DANN	Benign	0.92
Eigen	Uncertain	0.68
Eigen_PC	Uncertain	0.66
FATHMM_MKL	Uncertain	0.94	D
LIST_S2	Uncertain	0.92	D
M_CAP	Pathogenic	0.35	D
MetaRNN	Pathogenic	0.93	D
MetaSVM	Pathogenic	0.97	D
PhyloP100		5.2
PrimateAI	Uncertain	0.54	T
PROVEAN	Pathogenic	-4.8	D
REVEL	Pathogenic	0.86
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Vest4		0.91
MVP		0.92
MPC		0.53
ClinPred		0.90	D
GERP RS		6.0
gMVP		0.86
Mutation Taster		=5/95	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		Details are displayed if max score is > 0.2

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

Other links and lift over

dbSNP: rs797045120; hg19: chr8-43014092;