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UniProtKB/Swiss-Prot P06865: Variant p.Pro25Ser

Beta-hexosaminidase subunit alpha
Gene: HEXA
Variant information

Variant position:  25
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 implicated in disease according to literature reports.
  • Polymorphism: Variants not reported to be implicated in disease.
  • Unclassified: Variants with uncertain implication in disease according to literature reports. Evidence against or in favor of a pathogenic role is limited and/or conflicting.

Residue change:  From Proline (P) to Serine (S) at position 25 (P25S, p.Pro25Ser).
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:  Change from medium size and hydrophobic (P) to small size and polar (S)
The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:  -1
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:  GM2-gangliosidosis 1 (GM2G1) [MIM:272800]: An autosomal recessive lysosomal storage disease marked by the accumulation of GM2 gangliosides in the neuronal cells. It is characterized by GM2 gangliosides accumulation in the absence of HEXA activity, leading to neurodegeneration and, in the infantile form, death in early childhood. It exists in several forms: infantile (most common and most severe), juvenile and adult (late-onset). {ECO:0000269|PubMed:1301189, ECO:0000269|PubMed:1301190, ECO:0000269|PubMed:1302612, ECO:0000269|PubMed:14566483, ECO:0000269|PubMed:1532289, ECO:0000269|PubMed:1837283, ECO:0000269|PubMed:2140574, ECO:0000269|PubMed:2144098, ECO:0000269|PubMed:22723944, ECO:0000269|PubMed:2522679, ECO:0000269|PubMed:27682588, ECO:0000269|PubMed:2970528, ECO:0000269|PubMed:7717398, ECO:0000269|PubMed:7837766, ECO:0000269|PubMed:7898712, ECO:0000269|PubMed:7951261, ECO:0000269|PubMed:8445615, ECO:0000269|PubMed:8490625, ECO:0000269|PubMed:8581357, ECO:0000269|PubMed:8757036, ECO:0000269|PubMed:9150157, ECO:0000269|PubMed:9338583, ECO:0000269|PubMed:9375850, ECO:0000269|PubMed:9401008, ECO:0000269|PubMed:9603435}. 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 GM2G1; late infantile.
Any additional useful information about the variant.

Sequence information

Variant position:  25
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  529
The length of the canonical sequence.

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.

Propeptide 23 – 88
Alternative sequence 1 – 192 Missing. In isoform 2.

Literature citations

Two new mutations in a late infantile Tay-Sachs patient are both in exon 1 of the beta-hexosaminidase alpha subunit gene.
Harmon D.L.; Gardner-Medwin D.; Stirling J.L.;
J. Med. Genet. 30:123-128(1993)
Cited for: VARIANT GM2G1 SER-25;

Mutational analyses of Tay-Sachs disease: studies on Tay-Sachs carriers of French Canadian background living in New England.
Triggs-Raine B.L.; Richard M.; Wasel N.; Prence E.M.; Natowicz M.R.;
Am. J. Hum. Genet. 56:870-879(1995)
Cited for: VARIANTS GM2G1 SER-196 AND SER-250;

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.