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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot O00555: Variant p.Arg1345Gln

Voltage-dependent P/Q-type calcium channel subunit alpha-1A
Gene: CACNA1A
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Variant information Variant position: help 1345 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Type of variant: help 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: help From Arginine (R) to Glutamine (Q) at position 1345 (R1345Q, p.Arg1345Gln). 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: help 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: help 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: help In FHM1; with progressive cerebellar ataxia. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 1345 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 2506 The length of the canonical sequence.
Location on the sequence: help VAFAFTGNSKGKDINTIKSL R VLRVLRPLKTIKRLPKLKAV 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: help 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 – 2506 Voltage-dependent P/Q-type calcium channel subunit alpha-1A
Transmembrane 1339 – 1357 Helical; Name=S4 of repeat III
Repeat 1230 – 1513 III



Literature citations
A novel R1347Q mutation in the predicted voltage sensor segment of the P/Q-type calcium-channel alpha-subunit in a family with progressive cerebellar ataxia and hemiplegic migraine.
Alonso I.; Barros J.; Tuna A.; Seixas A.; Coutinho P.; Sequeiros J.; Silveira I.;
Clin. Genet. 65:70-72(2004)
Cited for: VARIANT FHM1 GLN-1345; CACNA1A R1347Q: a frequent recurrent mutation in hemiplegic migraine.
Stam A.H.; Vanmolkot K.R.; Kremer H.P.; Gartner J.; Brown J.; Leshinsky-Silver E.; Gilad R.; Kors E.E.; Frankhuizen W.S.; Ginjaar H.B.; Haan J.; Frants R.R.; Ferrari M.D.; van den Maagdenberg A.M.; Terwindt G.M.;
Clin. Genet. 74:481-485(2008)
Cited for: VARIANT FHM1 GLN-1345;
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.