rs749989641

Variant names:

• chr5-78885789-G-A
• rs749989641
• NM_000046.5:c.937C>T

Your query was ambiguous. Multiple possible variants found:

• chr5-78885789-G-A
• chr5-78885789-G-C
• chr5-78885789-G-T

Variant summary

Our verdict is Likely pathogenic. Variant got 9 ACMG points: 9P and 0B. PM2 PM5 PP3_Strong PP5

The NM_000046.5(ARSB):​c.937C>T​(p.Pro313Ser) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 12/21 in silico tools predict a damaging outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. P313A) has been classified as Pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: ARSB NM_000046.5 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:2 U:1
• Conservation: PhyloP100: 9.94

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 Likely_pathogenic. Variant got 9 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr5-78885789-G-C is described in Lovd as [Pathogenic].
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.97
• PP5: Variant 5-78885789-G-A is Pathogenic according to our data. Variant chr5-78885789-G-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 559827.We mark this variant Likely_pathogenic, oryginal submissions are: {Likely_pathogenic=1, Uncertain_significance=1, Pathogenic=1}. Variant chr5-78885789-G-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ARSB	NM_000046.5	c.937C>T	p.Pro313Ser	missense_variant	Exon 5 of 8	ENST00000264914.10	NP_000037.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ARSB	ENST00000264914.10	c.937C>T	p.Pro313Ser	missense_variant	Exon 5 of 8	1	NM_000046.5	ENSP00000264914.4
ARSB	ENST00000396151.7	c.937C>T	p.Pro313Ser	missense_variant	Exon 6 of 8	1		ENSP00000379455.3
ARSB	ENST00000565165.2	c.937C>T	p.Pro313Ser	missense_variant	Exon 5 of 5	1		ENSP00000456339.2
ARSB	ENST00000521800.2	n.119C>T		non_coding_transcript_exon_variant	Exon 2 of 3	2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 34

GnomAD4 genome Cov.: 32

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:2 Uncertain:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Mucopolysaccharidosis type 6 Pathogenic:2 Uncertain:1

Jul 18, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

ClinVar contains an entry for this variant (Variation ID: 559827). For these reasons, this variant has been classified as Pathogenic. This variant disrupts the p.Pro313 amino acid residue in ARSB. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 17458871, 17643332, 23557332, 27826022). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt ARSB protein function. This missense change has been observed in individual(s) with mucolipidosis VI (PMID: 17458871). This variant is not present in population databases (gnomAD no frequency). This sequence change replaces proline, which is neutral and non-polar, with serine, which is neutral and polar, at codon 313 of the ARSB protein (p.Pro313Ser). -

Jan 01, 2018

Laboratory of Diagnosis and Therapy of Lysosomal Disorders, University of Padova

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: curation

Absent from GnomAD (PM2) -

Jan 28, 2024

Baylor Genetics

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.84
BayesDel_addAF	Pathogenic	0.58	D
BayesDel_noAF	Pathogenic	0.59
CADD	Pathogenic	30
DANN	Pathogenic	1.0
DEOGEN2	Pathogenic	0.97	D;.;.
Eigen	Pathogenic	1.1
Eigen_PC	Pathogenic	0.99
FATHMM_MKL	Pathogenic	1.0	D
LIST_S2	Pathogenic	1.0	D;D;D
M_CAP	Pathogenic	0.65	D
MetaRNN	Pathogenic	0.97	D;D;D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Pathogenic	3.3	M;M;.
PrimateAI	Uncertain	0.78	T
PROVEAN	Pathogenic	-7.6	D;D;D
REVEL	Pathogenic	0.99
Sift	Uncertain	0.0010	D;D;D
Sift4G	Uncertain	0.0040	D;D;D
Polyphen		1.0	D;.;.
Vest4		0.95
MutPred		0.83		Gain of MoRF binding (P = 0.0452);Gain of MoRF binding (P = 0.0452);Gain of MoRF binding (P = 0.0452);
MVP		0.99
MPC		0.87
ClinPred		1.0	D
GERP RS		5.5
Varity_R		0.72
gMVP		0.95

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: rs749989641; hg19: chr5-78181612;