UniProtKB/Swiss-Prot Q6Q788: Variant p.Ser19Trp

Apolipoprotein A-V
Gene: APOA5
Chromosomal location: 11q23
Variant information

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

Type of variant:  Polymorphism
The variants are classified into three categories: Disease, Polymorphism and Unclassified.
  • Disease: Variants have been found in patients and disease-association is reported in literature. However, this classification is not a definitive assessment of variant pathogenicity.
  • Polymorphism: No disease-association has been reported.
  • Unclassified: Variants have been found in patients but disease-association remains unclear.

Residue change:  From Serine (S) to Tryptophan (W) at position 19 (S19W, p.Ser19Trp).
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 small size and polar (S) to large size and aromatic (W)
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

Polymorphism:  Three common alleles are known: allele APOA5*1, APOA5*2 and APOA5*3. The APOA5*2 haplotype, which consists of 3 non-coding SNPs, is present in approximately 16% of Caucasians and is associated with increased plasma triglyceride concentrations. APOA5*3 haplotype is defined by the rare Ser-19-Trp substitution. Together, the APOA5*2 and APOA5*3 haplotypes are found in 25 to 50% of African Americans, Hispanics, and Caucasians.
Additional information on the polymorphism described.

Variant description:  In allele APOA5*3; associated with high plasma triglyceride levels.
Any additional useful information about the variant.

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



Sequence information

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

Protein sequence length:  366
The length of the canonical sequence.

Location on the sequence:   MASMAAVLTWALALLSAF  S ATQARKGFWDYFSQTSGDKG
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                         MASMAAVLTWALALLSAFSATQARKGFWDYFSQTSGDKG

Mouse                         ---MAAVITWALALLAVFASTQARKSLWDYFSQNSWSKG

Rat                           ---MAAVITWALALLSVFATVQARKSFWEYFGQNSQGKG

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
Signal peptide 1 – 23


Literature citations

The effects of scale: variation in the APOA1/C3/A4/A5 gene cluster.
Fullerton S.M.; Buchanan A.V.; Sonpar V.A.; Taylor S.L.; Smith J.D.; Carlson C.S.; Salomaa V.; Stengaard J.H.; Boerwinkle E.; Clark A.G.; Nickerson D.A.; Weiss K.M.;
Hum. Genet. 115:36-56(2004)
Cited for: NUCLEOTIDE SEQUENCE [GENOMIC DNA]; VARIANTS TRP-19 AND MET-153;

Two independent apolipoprotein A5 haplotypes influence human plasma triglyceride levels.
Pennacchio L.A.; Olivier M.; Hubacek J.A.; Krauss R.M.; Rubin E.M.; Cohen J.C.;
Hum. Mol. Genet. 11:3031-3038(2002)
Cited for: VARIANT TRP-19;

Ser19Trp polymorphism within the apolipoprotein AV gene in hypertriglyceridaemic people.
Vrablik M.; Horinek A.; Ceska R.; Adamkova V.; Poledne R.; Hubacek J.A.;
J. Med. Genet. 40:E105-E105(2003)
Cited for: VARIANT TRP-19;

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.