rs750845916

Positions:

• chr5-78985003-CA-C

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The ENST00000264914.10(ARSB):​c.245del​(p.Leu82ArgfsTer32) variant causes a frameshift change. The variant allele was found at a frequency of 0.00000577 in 1,387,590 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Likely pathogenic (★★). Synonymous variant affecting the same amino acid position (i.e. L82L) has been classified as Likely benign. Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000058 (0 hom.)
• Consequence: ARSB ENST00000264914.10 frameshift
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:2
• Conservation: PhyloP100: 7.03

Genes affected

ARSB (HGNC:714): (arylsulfatase B) Arylsulfatase B encoded by this gene belongs to the sulfatase family. The arylsulfatase B homodimer hydrolyzes sulfate groups of N-Acetyl-D-galactosamine, chondriotin sulfate, and dermatan sulfate. The protein is targeted to the lysozyme. Mucopolysaccharidosis type VI is an autosomal recessive lysosomal storage disorder resulting from a deficiency of arylsulfatase B. Two alternatively spliced transcript variants encoding distinct isoforms have been found for this gene. [provided by RefSeq, Dec 2016]

ACMG classification

Verdict is Pathogenic. Variant got 18 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 5-78985003-CA-C is Pathogenic according to our data. Variant chr5-78985003-CA-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 559746.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
ARSB	NM_000046.5	c.245del	p.Leu82ArgfsTer32	frameshift_variant	1/8	ENST00000264914.10	NP_000037.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
ARSB	ENST00000264914.10	c.245del	p.Leu82ArgfsTer32	frameshift_variant	1/8	1	NM_000046.5	ENSP00000264914	P1
ARSB	ENST00000396151.7	c.245del	p.Leu82ArgfsTer32	frameshift_variant	2/8	1		ENSP00000379455
ARSB	ENST00000565165.2	c.245del	p.Leu82ArgfsTer32	frameshift_variant	1/5	1		ENSP00000456339

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD3 exomes AF: 0.00000567 AC: 1 AN: 176244 Hom.: 0 AF XY: 0.0000100 AC XY: 1 AN XY: 99946

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000125

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000577 AC: 8 AN: 1387590 Hom.: 0 Cov.: 31 AF XY: 0.00000725 AC XY: 5 AN XY: 689762

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: 0.00000649

Gnomad4 OTH exome AF: 0.0000176

GnomAD4 genome Cov.: 33

Bravo AF: 0.00000378

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Mucopolysaccharidosis type 6 Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Dec 07, 2022	This sequence change creates a premature translational stop signal (p.Leu82Argfs*32) in the ARSB gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in ARSB are known to be pathogenic (PMID: 17458871, 22133300). This variant is present in population databases (rs750845916, gnomAD 0.001%). For these reasons, this variant has been classified as Pathogenic. ClinVar contains an entry for this variant (Variation ID: 559746). This premature translational stop signal has been observed in individual(s) with mucopolysaccharidosis type VI (PMID: 10923267). -
Likely pathogenic, criteria provided, single submitter	curation	Laboratory of Diagnosis and Therapy of Lysosomal Disorders, University of Padova	Jan 01, 2018	Frameshift variant (PVS1); Very low frequence in GnomAd (PM2) -

Computational scores

Source: dbNSFP v4.3

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: rs750845916; hg19: chr5-78280826;