UniProtKB/Swiss-Prot P15289: Variant p.Pro426Leu

Arylsulfatase A
Gene: ARSA
Chromosomal location: 22q13.31-qter
Variant information

Variant position:  426
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Type of variant:  Disease [Disclaimer]
The variants are classified into three categories: Disease, Polymorphism and Unclassified.
  • Disease: Variants have been found in patients and disease-association is reported in literature. However, this classification is not a definitive assessment of variant pathogenicity.
  • Polymorphism: No disease-association has been reported.
  • Unclassified: Variants have been found in patients but disease-association remains unclear.

Residue change:  From Proline (P) to Leucine (L) at position 426 (P426L, p.Pro426Leu).
Indicates the amino acid change of the variant. The one-letter and three-letter codes for amino acids used in UniProtKB/Swiss-Prot are those adopted by the commission on Biochemical Nomenclature of the IUPAC-IUB.

Physico-chemical properties:  Similar physico-chemical property. Both residues are medium size and hydrophobic.
The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:  -3
The score within a Blosum matrix for the corresponding wild-type to variant amino acid change. The log-odds score measures the logarithm for the ratio of the likelihood of two amino acids appearing by chance. The Blosum62 substitution matrix is used. This substitution matrix contains scores for all possible exchanges of one amino acid with another:
  • Lowest score: -4 (low probability of substitution).
  • Highest score: 11 (high probability of substitution).
More information can be found on the following page

Involvement in disease:  Leukodystrophy metachromatic (MLD) [MIM:250100]: A leukodystrophy due to a lysosomal storage defect. Characterized by intralysosomal storage of cerebroside-3-sulfate in neural and non-neural tissues, with a diffuse loss of myelin in the central nervous system. Progressive demyelination causes a variety of neurological symptoms, including gait disturbances, ataxias, optical atrophy, dementia, seizures, and spastic tetraparesis. Three forms of the disease can be distinguished according to the age at onset: late-infantile, juvenile and adult. Note=The disease is caused by mutations affecting the gene represented in this entry.
The name and a short description of the disease associated with the variant. For more information about the disease, the user can refer to OMIM, following the link provided after the disease acronym.

Variant description:  In MLD; juvenile/adult-onset; mild; common mutation.
Any additional useful information about the variant.

Other resources:  
Links to websites of interest for the variant.



Sequence information

Variant position:  426
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  507
The length of the canonical sequence.

Location on the sequence:   SDTTADPACHASSSLTAHEP  P LLYDLSKDPGENYNLLGGVA
The residue change on the sequence. Unless the variant is located at the beginning or at the end of the protein sequence, both residues upstream (20) and downstream (20) of the variant will be shown.

Sequence annotation in neighborhood:  
The regions or sites of interest surrounding the variant. In general the features listed are posttranslational modifications, binding sites, enzyme active sites, local secondary structure or other characteristics reported in the cited references. The "Sequence annotation in neighborhood" lines have a fixed format:
  • Type: the type of sequence feature.
  • Positions: endpoints of the sequence feature.
  • Description: contains additional information about the feature.

TypePositionsDescription
Chain 19 – 507 Arylsulfatase A
Chain 19 – 444 Arylsulfatase A component B
Beta strand 421 – 430


Literature citations

Molecular basis of different forms of metachromatic leukodystrophy.
Polten A.; Fluharty A.L.; Fluharty C.B.; Kappler J.; von Figura K.; Gieselmann V.;
N. Engl. J. Med. 324:18-22(1991)
Cited for: VARIANT MLD LEU-426; VARIANTS CYS-193 AND SER-391;

Prevalence of common mutations in the arylsulphatase A gene in metachromatic leukodystrophy patients diagnosed in Britain.
Barth M.L.; Fensom A.; Harris A.;
Hum. Genet. 91:73-77(1993)
Cited for: VARIANT MLD LEU-426;

Metachromatic leukodystrophy: subtype genotype/phenotype correlations and identification of novel missense mutations (P148L and P191T) causing the juvenile-onset disease.
Qu Y.; Shapira E.; Desnick R.J.;
Mol. Genet. Metab. 67:206-212(1999)
Cited for: VARIANTS MLD LEU-148; THR-191; VAL-335; TYR-397 AND LEU-426;

Contribution of arylsulfatase A mutations located on the same allele to enzyme activity reduction and metachromatic leukodystrophy severity.
Regis S.; Corsolini F.; Stroppiano M.; Cusano R.; Filocamo M.;
Hum. Genet. 110:351-355(2002)
Cited for: VARIANT MLD LYS-253; VARIANTS SER-350; SER-391 AND LEU-426;

Identification of nine novel arylsulfatase A (ARSA) gene mutations in patients with metachromatic leukodystrophy (MLD).
Eng B.; Nakamura L.N.; O'Reilly N.; Schokman N.; Nowaczyk M.M.J.; Krivit W.; Waye J.S.;
Hum. Mutat. 22:418-419(2003)
Cited for: VARIANTS MLD LEU-155; GLN-181; VAL-212; HIS-306; SER-325; VAL-335; LEU-426 AND SER-429;

Novel mutations in arylsulfatase A gene in three Ukrainian families with metachromatic leukodystrophy.
Olkhovich N.V.; Takamura N.; Pichkur N.A.; Gorovenko N.G.; Aoyagi K.; Yamashita S.;
Mol. Genet. Metab. 80:360-363(2003)
Cited for: VARIANTS MLD SER-136; SER-247; GLU-381 LEU-426 AND GLY-469;

Novel mutations associated with metachromatic leukodystrophy: phenotype and expression studies in nine Czech and Slovak patients.
Berna L.; Gieselmann V.; Poupetova H.; Hrebicek M.; Elleder M.; Ledvinova J.;
Am. J. Med. Genet. A 129:277-281(2004)
Cited for: VARIANTS MLD ASN-29; ARG-156; SER-179; SER-293; TYR-294; SER-309 AND LEU-426; VARIANTS CYS-193 AND SER-391; CHARACTERIZATION OF VARIANTS MLD ASN-29; ARG-156; SER-293 AND TYR-294;

Molecular bases of metachromatic leukodystrophy in Polish patients.
Lugowska A.; Ploski R.; Wlodarski P.; Tylki-Szymanska A.;
J. Hum. Genet. 55:394-396(2010)
Cited for: VARIANTS MLD SER-179; SER-247; CYS-288; VAL-335; LYS-382; GLN-390; TRP-390; TYR-397 AND LEU-426;

Disclaimer: Any medical or genetic information present in this entry is provided for research, educational and informational purposes only. They are not in any way intended to be used as a substitute for professional medical advice, diagnostic, treatment or care.