Genetic Variant ARSA:p.Gly124Arg (chr22-50627261-C-G) – ACMG Classification: Pathogenic (11 pts)

Variant summary

Our verdict is Pathogenic. The variant received 11 ACMG points: 11P and 0B. PM1PM2PM5PP2PP3_Strong

The NM_000487.6(ARSA):c.370G>C(p.Gly124Arg) variant causes a missense change. The variant allele was found at a frequency of 0.00000069 in 1,449,390 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 has been classified as Likely pathogenic.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 6.9e-7 ( 0 hom. )

Consequence

ARSA
NM_000487.6 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 4.89

Publications

8 publications found

Variant links:

Genes affected

ARSA (HGNC:713): (arylsulfatase A) The protein encoded by this gene hydrolyzes cerebroside sulfate to cerebroside and sulfate. Defects in this gene lead to metachromatic leucodystrophy (MLD), a progressive demyelination disease which results in a variety of neurological symptoms and ultimately death. Alternatively spliced transcript variants have been described for this gene. [provided by RefSeq, Dec 2010]

ARSA Gene-Disease associations (from GenCC):

metachromatic leukodystrophy
Inheritance: AR Classification: DEFINITIVE Submitted by: Myriad Women’s Health, ClinGen
metachromatic leukodystrophy, juvenile form
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae), G2P, Genomics England PanelApp

ARSA links:

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ACMG classification

Classification was made for transcript

Our verdict: Pathogenic. The variant received 11 ACMG points.

PM1

In a hotspot region, there are 5 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 11 uncertain in NM_000487.6

PM2

Very rare variant in population databases, with high coverage;

PM5

Other missense variant is known to change same aminoacid residue: Variant chr22-50627257-TTGCCG-CCCAAGGTT is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 166692.

PP2

Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 159 curated pathogenic missense variants (we use a threshold of 10). The gene has 11 curated benign missense variants. Gene score misZ: 0.38013 (below the threshold of 3.09). Trascript score misZ: -0.56919 (below the threshold of 3.09). GenCC associations: The gene is linked to metachromatic leukodystrophy, juvenile form, metachromatic leukodystrophy.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.955

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ARSA	NM_000487.6 link	c.370G>C	p.Gly124Arg	missense_variant	Exon 2 of 8	ENST00000216124.10	NP_000478.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ARSA	ENST00000216124.10 link	c.370G>C	p.Gly124Arg	missense_variant	Exon 2 of 8	1	NM_000487.6	ENSP00000216124.5

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.90e-7

AC:

AN:

1449390

Hom.:

Cov.:

AF XY:

0.00000139

AC XY:

AN XY:

720304

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33240

American (AMR)

AF:

0.00

AC:

AN:

42352

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25826

East Asian (EAS)

AF:

0.00

AC:

AN:

39100

South Asian (SAS)

AF:

0.00

AC:

AN:

85016

European-Finnish (FIN)

AF:

0.00

AC:

AN:

51398

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5748

European-Non Finnish (NFE)

AF:

9.03e-7

AC:

AN:

1106844

Other (OTH)

AF:

0.00

AC:

AN:

59866

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.525

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

Alfa

AF:

0.00

Hom.:

Bravo

AF:

0.00000378

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.98

BayesDel_addAF

Pathogenic

0.42

BayesDel_noAF

Pathogenic

0.36

CADD

Pathogenic

(source)

DANN

Pathogenic

1.0

DEOGEN2

Uncertain

0.66

D;D;D;.;D

Eigen

Pathogenic

0.80

Eigen_PC

Uncertain

0.66

FATHMM_MKL

Uncertain

0.97

LIST_S2

Benign

0.0

.;.;.;D;D

M_CAP

Pathogenic

0.32

MetaRNN

Pathogenic

0.95

D;D;D;D;D

MetaSVM

Pathogenic

1.1

MutationAssessor

Benign

0.0

.;.;.;.;.

PhyloP100

4.9

PrimateAI

Uncertain

0.76

PROVEAN

Pathogenic

-7.3

D;D;D;D;D

REVEL

Pathogenic

0.93

Sift

Pathogenic

0.0

D;D;D;D;D

Sift4G

Pathogenic

0.0

D;D;D;D;D

Vest4

0.86

ClinPred

1.0

GERP RS

3.7

gMVP

0.99

Mutation Taster

=6/94

disease causing

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Computational scores

Splicing

Publications

Other links and lift over