UniProtKB/Swiss-Prot P14867: Variant p.Asp219Asn

Gamma-aminobutyric acid receptor subunit alpha-1
Gene: GABRA1
Chromosomal location: 5q34-q35
Variant information

Variant position:  219
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 Aspartate (D) to Asparagine (N) at position 219 (D219N, p.Asp219Asn).
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 acidic (D) to medium size and polar (N)
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:  Epilepsy, idiopathic generalized 13 (EIG13) [MIM:611136]: A disorder characterized by recurring generalized seizures in the absence of detectable brain lesions and/or metabolic abnormalities. Generalized seizures arise diffusely and simultaneously from both hemispheres of the brain. Seizure types include juvenile myoclonic seizures, absence seizures, and generalized tonic-clonic seizures. {ECO:0000269|PubMed:21714819}. Note=Disease susceptibility is associated with variations 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 EIG13; the mutant protein is partially retained in the endoplasmic reticulum and has decreased expression at the plasma membrane; causes decreased current amplitude in response to GABA compared to wild-type and alters receptor gating kinetics including faster desensitization.
Any additional useful information about the variant.

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

Sequence information

Variant position:  219
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  456
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.

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






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.

Chain 28 – 456 Gamma-aminobutyric acid receptor subunit alpha-1
Topological domain 28 – 251 Extracellular

Literature citations

Novel alpha1 and gamma2 GABAA receptor subunit mutations in families with idiopathic generalized epilepsy.
Lachance-Touchette P.; Brown P.; Meloche C.; Kinirons P.; Lapointe L.; Lacasse H.; Lortie A.; Carmant L.; Bedford F.; Bowie D.; Cossette P.;
Eur. J. Neurosci. 34:237-249(2011)

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.