chr12-64737039-G-C

Variant names:

• chr12-64737039-G-C
• rs119461974
• NM_002076.4:c.1063C>G

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_002076.4(GNS):​c.1063C>G​(p.Arg355Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000069 in 1,449,104 control chromosomes in the GnomAD database, with no homozygous occurrence. 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 variant affecting the same amino acid position, but resulting in a different missense (i.e. R355L) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: GNS NM_002076.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 2.55
• Publications: 0 publications found

Genes affected

GNS (HGNC:4422): (glucosamine (N-acetyl)-6-sulfatase) The product of this gene is a lysosomal enzyme found in all cells. It is involved in the catabolism of heparin, heparan sulphate, and keratan sulphate. Deficiency of this enzyme results in the accumulation of undegraded substrate and the lysosomal storage disorder mucopolysaccharidosis type IIID (Sanfilippo D syndrome). Mucopolysaccharidosis type IIID is the least common of the four subtypes of Sanfilippo syndrome. [provided by RefSeq, Jul 2008]

GNS Gene-Disease associations (from GenCC):

• mucopolysaccharidosis type 3D

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

ACMG classification

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.906

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_002076.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GNS	NM_002076.4	MANE Select	c.1063C>G	p.Arg355Gly	missense	Exon 9 of 14	NP_002067.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GNS	ENST00000258145.8	TSL:1 MANE Select	c.1063C>G	p.Arg355Gly	missense	Exon 9 of 14	ENSP00000258145.3
	GNS	ENST00000418919.6	TSL:1	c.895C>G	p.Arg299Gly	missense	Exon 8 of 13	ENSP00000413130.2
	GNS	ENST00000543646.5	TSL:2	c.1159C>G	p.Arg387Gly	missense	Exon 10 of 15	ENSP00000438497.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.90e-7 AC: 1 AN: 1449104 Hom.: 0 Cov.: 28 AF XY: 0.00 AC XY: 0 AN XY: 721844

African (AFR) AF: 0.00 AC: 0 AN: 33196

American (AMR) AF: 0.00 AC: 0 AN: 44710

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26068

East Asian (EAS) AF: 0.00 AC: 0 AN: 39634

South Asian (SAS) AF: 0.00 AC: 0 AN: 85968

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53410

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5744

European-Non Finnish (NFE) AF: 9.09e-7 AC: 1 AN: 1100400

Other (OTH) AF: 0.00 AC: 0 AN: 59974

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.76
BayesDel_addAF	Pathogenic	0.54	D
BayesDel_noAF	Pathogenic	0.54
CADD	Pathogenic	29
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.95	D
Eigen	Uncertain	0.60
Eigen_PC	Uncertain	0.60
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Uncertain	0.97	D
M_CAP	Pathogenic	0.43	D
MetaRNN	Pathogenic	0.91	D
MetaSVM	Uncertain	0.64	D
MutationAssessor	Pathogenic	4.7	H
PhyloP100		2.6
PrimateAI	Pathogenic	0.81	D
PROVEAN	Pathogenic	-5.5	D
REVEL	Pathogenic	0.92
Sift	Uncertain	0.0050	D
Sift4G	Uncertain	0.014	D
Polyphen		1.0	D
Vest4		0.86
MutPred		0.69		Gain of catalytic residue at L385 (P = 0)
MVP		0.97
MPC		1.4
ClinPred		1.0	D
GERP RS		5.5
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.93
gMVP		0.95
Mutation Taster		=11/89	disease causing

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

Other links and lift over

dbSNP: rs119461974; hg19: chr12-65130819;