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UniProtKB/Swiss-Prot P01116: Variant p.Leu19Phe

GTPase KRas
Gene: KRAS
Variant information

Variant position:  19
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 Leucine (L) to Phenylalanine (F) at position 19 (L19F, p.Leu19Phe).
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 hydrophobic (L) to large size and aromatic (F)
The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:  0
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:  Oculoectodermal syndrome (OES) [MIM:600268]: A syndrome characterized by the association of epibulbar dermoids and aplasia cutis congenita. Affected individuals show multiple, asymmetric, atrophic, non-scarring and hairless regions that may be associated with hamartomas. Ectodermal changes include linear hyperpigmentation that may follow the lines of Blaschko and rarely epidermal nevus-like lesions. Epibulbar dermoids may be uni-or bilateral. Additional ocular anomalies such as skin tags of the upper eyelid, rarely optic nerve or retinal changes, and microphthalmia can be present. The phenotypic expression is highly variable, and various other abnormalities have occasionally been reported including growth failure, lymphedema, cardiovascular defects, as well as neurodevelopmental symptoms like developmental delay, epilepsy, learning difficulties, and behavioral abnormalities. Benign tumor-like lesions such as nonossifying fibromas of the long bones and giant cell granulomas of the jaws have repeatedly been observed and appear to be age-dependent, becoming a common manifestation in individuals aged 5 years or older. {ECO:0000269|PubMed:25808193, ECO:0000269|PubMed:26970110, ECO:0000269|PubMed:30891959}. 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 OES; somatic mutation.
Any additional useful information about the variant.

Sequence information

Variant position:  19
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  189
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 – 186 GTPase KRas
Initiator methionine 1 – 1 Removed; alternate
Chain 2 – 186 GTPase KRas, N-terminally processed
Modified residue 1 – 1 N-acetylmethionine; in GTPase KRas; alternate
Modified residue 2 – 2 N-acetylthreonine; in GTPase KRas, N-terminally processed
Helix 16 – 25

Literature citations

Oculoectodermal syndrome is a mosaic RASopathy associated with KRAS alterations.
Peacock J.D.; Dykema K.J.; Toriello H.V.; Mooney M.R.; Scholten D.J. II; Winn M.E.; Borgman A.; Duesbery N.S.; Hiemenga J.A.; Liu C.; Campbell S.; Nickoloff B.P.; Williams B.O.; Steensma M.;
Am. J. Med. Genet. A 167:1429-1435(2015)

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.