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UniProtKB/Swiss-Prot Q99250: Variant p.Arg223Gln

Sodium channel protein type 2 subunit alpha
Gene: SCN2A
Variant information

Variant position:  223
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Type of variant:  LP/P [Disclaimer]
The variants are classified into three categories: LP/P, LB/B and US.
  • LP/P: likely pathogenic or pathogenic.
  • LB/B: likely benign or benign.
  • US: uncertain significance

Residue change:  From Arginine (R) to Glutamine (Q) at position 223 (R223Q, p.Arg223Gln).
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 (Q)
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

Variant description:  In BFIS3; increased voltage-gated sodium channel activity; modified voltage dependence of activation and inactivation; gain of function.
Any additional useful information about the variant.

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

Sequence information

Variant position:  223
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  2005
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 1 – 2005 Sodium channel protein type 2 subunit alpha
Transmembrane 215 – 231 Helical; Name=S4 of repeat I
Repeat 111 – 456 I
Glycosylation 212 – 212 N-linked (GlcNAc...) asparagine
Alternative sequence 209 – 209 D -> N. In isoform 2.
Helix 218 – 226

Literature citations

Benign familial neonatal-infantile seizures: characterization of a new sodium channelopathy.
Berkovic S.F.; Heron S.E.; Giordano L.; Marini C.; Guerrini R.; Kaplan R.E.; Gambardella A.; Steinlein O.K.; Grinton B.E.; Dean J.T.; Bordo L.; Hodgson B.L.; Yamamoto T.; Mulley J.C.; Zara F.; Scheffer I.E.;
Ann. Neurol. 55:550-557(2004)
Cited for: VARIANTS BFIS3 GLN-223; ILE-892; ILE-1003 AND GLN-1319;

Effects in neocortical neurons of mutations of the Na(v)1.2 Na+ channel causing benign familial neonatal-infantile seizures.
Scalmani P.; Rusconi R.; Armatura E.; Zara F.; Avanzini G.; Franceschetti S.; Mantegazza M.;
J. Neurosci. 26:10100-10109(2006)

Genetic testing in benign familial epilepsies of the first year of life: clinical and diagnostic significance.
Zara F.; Specchio N.; Striano P.; Robbiano A.; Gennaro E.; Paravidino R.; Vanni N.; Beccaria F.; Capovilla G.; Bianchi A.; Caffi L.; Cardilli V.; Darra F.; Bernardina B.D.; Fusco L.; Gaggero R.; Giordano L.; Guerrini R.; Incorpora G.; Mastrangelo M.; Spaccini L.; Laverda A.M.; Vecchi M.; Vanadia F.; Veggiotti P.; Viri M.; Occhi G.; Budetta M.; Taglialatela M.; Coviello D.A.; Vigevano F.; Minetti C.;
Epilepsia 54:425-436(2013)
Cited for: VARIANTS BFIS3 GLN-223; LYS-1001; GLN-1319 AND ASN-1641;

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.