17-80220312-A-T

Position:

• chr17-80220312-A-T

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PVS1 PS1_Moderate PM2

The NM_000199.5(SGSH):​c.2T>A​(p.Met1?) variant causes a start lost change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000015 in 1,337,786 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.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000015 (0 hom.)
• Consequence: SGSH NM_000199.5 start_lost
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.913

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]

SLC26A11 (HGNC:14471): (solute carrier family 26 member 11) This gene encodes a member of the solute linked carrier 26 family of anion exchangers. Members of this family of proteins are essential for numerous cellular functions including homeostasis and intracellular electrolyte balance. The encoded protein is a sodium independent sulfate transporter that is sensitive to the anion exchanger inhibitor 4,4'-diisothiocyanostilbene-2,2'-disulfonic acid. Alternate splicing results in multiple transcript variants.[provided by RefSeq, Oct 2009]

ACMG classification

Verdict is Pathogenic. Variant got 12 ACMG points.

• PVS1: Start lost variant, no new inframe start found.
• PS1: Another start lost variant in NM_000199.5 (SGSH) was described as [Pathogenic] in Lovd
• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SGSH	NM_000199.5	c.2T>A	p.Met1?	start_lost	1/8	ENST00000326317.11	NP_000190.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SGSH	ENST00000326317.11	c.2T>A	p.Met1?	start_lost	1/8	1	NM_000199.5	ENSP00000314606.6

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000150 AC: 2 AN: 1337786 Hom.: 0 Cov.: 31 AF XY: 0.00000152 AC XY: 1 AN XY: 658856

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000326

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 9.45e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

Bravo AF: 0.00000378

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.28
CADD	Benign	21
DANN	Benign	0.93
DEOGEN2	Benign	0.12	T;.;.
Eigen	Benign	-0.42
Eigen_PC	Benign	-0.49
FATHMM_MKL	Uncertain	0.76	D
LIST_S2	Uncertain	0.90	D;D;D
M_CAP	Pathogenic	0.97	D
MetaRNN	Pathogenic	0.97	D;D;D
MetaSVM	Uncertain	0.61	D
PROVEAN	Benign	-1.3	N;.;.
REVEL	Pathogenic	0.70
Sift	Pathogenic	0.0	D;.;.
Sift4G	Uncertain	0.010	D;D;.
Polyphen		0.043	B;.;.
Vest4		0.76
MutPred		0.85		Gain of ubiquitination at M1 (P = 0.023);Gain of ubiquitination at M1 (P = 0.023);Gain of ubiquitination at M1 (P = 0.023);
MVP		0.97
ClinPred		0.98	D
GERP RS		2.0
Varity_R		0.94
gMVP		0.85

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

Other links and lift over

dbSNP: rs1488660868; hg19: chr17-78194111;