UniProtKB/Swiss-Prot P49419: Variant p.Gly202Val

Alpha-aminoadipic semialdehyde dehydrogenase
Gene: ALDH7A1
Chromosomal location: 5q31
Variant information

Variant position:  202
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 Glycine (G) to Valine (V) at position 202 (G202V, p.Gly202Val).
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 glycine (G) to medium size and hydrophobic (V)
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:  Pyridoxine-dependent epilepsy (PDE) [MIM:266100]: Characterized by a combination of various seizure types. It usually occurs in the first hours of life and is unresponsive to standard anticonvulsants, responding only to immediate administration of pyridoxine hydrochloride. 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 PDE.
Any additional useful information about the variant.



Sequence information

Variant position:  202
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  539
The length of the canonical sequence.

Location on the sequence:   WNPVGLVGIITAFNFPVAVY  G WNNAIAMICGNVCLWKGAPT
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.

Residue conservation: 
The multiple alignment of the region surrounding the variant against various orthologous sequences.

Human                         WNPVGLVGIITAFNFPVAVYGWNNAIAMICGNVCLWKGAPT

Mouse                         WNPLGLVGIITAFNFPVAVFGWNNAIALITGNVCLWKGAPT

Rat                           WNPLGLVGIITAFNFPVAVFGWNNAIALITGNVCLWKGAPT

Bovine                        WNPVGLVGIITAFNFPVAVYGWNNAIAMICGNACLWKGAPT

Caenorhabditis elegans        WNPLGVVGVISAFNFPCAVYGWNNALALVTGNSVVWKPAPS

Slime mold                    WNPLGLVGIITAFNFPCAVLGWNAAISMICGNVQLWKGAST

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 27 – 539 Alpha-aminoadipic semialdehyde dehydrogenase
Site 195 – 195 Transition state stabilizer
Alternative sequence 31 – 222 Missing. In isoform 3.
Helix 199 – 210


Literature citations

Biochemical and molecular characterization of 18 patients with pyridoxine-dependent epilepsy and mutations of the antiquitin (ALDH7A1) gene.
Plecko B.; Paul K.; Paschke E.; Stoeckler-Ipsiroglu S.; Struys E.; Jakobs C.; Hartmann H.; Luecke T.; di Capua M.; Korenke C.; Hikel C.; Reutershahn E.; Freilinger M.; Baumeister F.; Bosch F.; Erwa W.;
Hum. Mutat. 28:19-26(2007)
Cited for: VARIANTS PDE VAL-202; GLU-291; ILE-301; GLN-335; GLY-395; GLN-427 AND ASN-458;

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.