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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot P42336: Variant p.Cys420Arg

Phosphatidylinositol 4,5-bisphosphate 3-kinase catalytic subunit alpha isoform
Gene: PIK3CA
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Variant information Variant position: help 420 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Type of variant: help US 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 Cysteine (C) to Arginine (R) at position 420 (C420R, p.Cys420Arg). 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 medium size and polar (C) to large size and basic (R) The physico-chemical property of the reference and variant residues and the change implicated.
BLOSUM score: help -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

Variant description: help In CLOVE, CRC and CLAPO; uncertain significance; somatic mutation in CLAPO patients; shows an increase in lipid kinase activity; may increase the affinity for lipid membranes. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 420 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 1068 The length of the canonical sequence.
Location on the sequence: help ARLCLSICSVKGRKGAKEEH C PLAWGNINLFDYTDTLVSGK 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: help The multiple alignment of the region surrounding the variant against various orthologous sequences.
Human                         ARLCLSICSVKGRKGAKEEHCPLAWGNINLFDYTDTLVSGK

Mouse                         ARLCLSICSVKGRKGAKEEHCPLAWGNINLFDYTDTLVSGK

Rat                           ARLCLSICSVKGRKGAKEEHCPLAWGNINLFDYTDTLVSGK

Bovine                        ARLCLSICSVKGRKGAKEEHCPLAWGNINLFDYTDTLVSGK

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 – 1068 Phosphatidylinositol 4,5-bisphosphate 3-kinase catalytic subunit alpha isoform
Domain 330 – 487 C2 PI3K-type
Beta strand 420 – 430



Literature citations
CLAPO syndrome: identification of somatic activating PIK3CA mutations and delineation of the natural history and phenotype.
Rodriguez-Laguna L.; Ibanez K.; Gordo G.; Garcia-Minaur S.; Santos-Simarro F.; Agra N.; Vallespin E.; Fernandez-Montano V.E.; Martin-Arenas R.; Del Pozo A.; Gonzalez-Pecellin H.; Mena R.; Rueda-Arenas I.; Gomez M.V.; Villaverde C.; Bustamante A.; Ayuso C.; Ruiz-Perez V.L.; Nevado J.; Lapunzina P.; Lopez-Gutierrez J.C.; Martinez-Glez V.;
Genet. Med. 20:882-889(2018)
Cited for: INVOLVEMENT IN CLAPO; VARIANTS CLAPO SER-83; PRO-115; ARG-420; LYS-542 AND LEU-1047; Functional analysis of PIK3CA gene mutations in human colorectal cancer.
Ikenoue T.; Kanai F.; Hikiba Y.; Obata T.; Tanaka Y.; Imamura J.; Ohta M.; Jazag A.; Guleng B.; Tateishi K.; Asaoka Y.; Matsumura M.; Kawabe T.; Omata M.;
Cancer Res. 65:4562-4567(2005)
Cited for: INVOLVEMENT IN CRC; CHARACTERIZATION OF VARIANTS CRC HIS-38; VAL-106; ARG-420; GLN-453; LYS-542; LYS-545; ILE-1043 AND ARG-1047; Somatic mosaic activating mutations in PIK3CA cause CLOVES syndrome.
Kurek K.C.; Luks V.L.; Ayturk U.M.; Alomari A.I.; Fishman S.J.; Spencer S.A.; Mulliken J.B.; Bowen M.E.; Yamamoto G.L.; Kozakewich H.P.; Warman M.L.;
Am. J. Hum. Genet. 90:1108-1115(2012)
Cited for: VARIANTS CLOVE ARG-420; LYS-542 AND ARG-1047;
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.