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UniProtKB/Swiss-Prot O43526: Variant p.Arg210Cys

Potassium voltage-gated channel subfamily KQT member 2
Gene: KCNQ2
Chromosomal location: 20q13.3
Variant information

Variant position:  210
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 Arginine (R) to Cysteine (C) at position 210 (R210C, p.Arg210Cys).
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 large size and basic (R) to medium size and polar (C)
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:  Epileptic encephalopathy, early infantile, 7 (EIEE7) [MIM:613720]: An autosomal dominant seizure disorder characterized by infantile onset of refractory seizures with resultant delayed neurologic development and persistent neurologic abnormalities. {ECO:0000269|PubMed:12742592, ECO:0000269|PubMed:15249611, ECO:0000269|PubMed:24463883, ECO:0000269|PubMed:25740509, ECO:0000269|PubMed:25818041, ECO:0000269|PubMed:26138355, ECO:0000269|PubMed:26993267, ECO:0000269|PubMed:27864847}. 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 EIEE7.
Any additional useful information about the variant.

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



Sequence information

Variant position:  210
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  872
The length of the canonical sequence.

Location on the sequence:   NVFATSALRSLRFLQILRMI  R MDRRGGTWKLLGSVVYAHSK
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                         NVFATSALRSLRFLQILRMIRMDRRGGTWKLLGSVVYAHSK

Mouse                         NVFATSALRSLRFLQILRMIRMDRRGGTWKLLGSVVYAHSK

Rat                           NVFATSALRSLRFLQILRMIRMDRRGGTWKLLGSVVYAHSK

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 1 – 872 Potassium voltage-gated channel subfamily KQT member 2
Transmembrane 196 – 218 Helical; Voltage-sensor; Name=Segment S4
Modified residue 217 – 217 Phosphothreonine
Mutagenesis 217 – 217 T -> A. No effect on current or expression.
Mutagenesis 217 – 217 T -> D. Abolishes currents without reducing channel protein expression.


Literature citations

Diagnostic yield of genetic testing in epileptic encephalopathy in childhood.
Mercimek-Mahmutoglu S.; Patel J.; Cordeiro D.; Hewson S.; Callen D.; Donner E.J.; Hahn C.D.; Kannu P.; Kobayashi J.; Minassian B.A.; Moharir M.; Siriwardena K.; Weiss S.K.; Weksberg R.; Snead O.C. III;
Epilepsia 56:707-716(2015)
Cited for: VARIANTS EIEE7 CYS-210; PRO-234 AND 578-MET-LEU-579 DELINS ILE-MET;

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.