Functionally distinct ERAP1 allotype combinations distinguish individuals with Ankylosing Spondylitis
Emma Reeves1, Alexandra Colebatch-Bourn2, Tim Elliott3
1Cancer Sciences Unit, Faculty of Medicine and.
Summary
Genetic variations in endoplasmic reticulum aminopeptidase 1 (ERAP1) influence Ankylosing Spondylitis (AS) risk. Specific ERAP1 allotype pairs in AS patients impair peptide trimming, affecting antigen presentation and disease predisposition.
Area of Science:
- Immunogenetics
- Molecular Biology
- Rheumatology
Background:
- Ankylosing Spondylitis (AS) is a chronic inflammatory disease strongly associated with HLA-B27 expression.
- The precise mechanisms linking HLA-B27 to AS remain elusive.
- Polymorphisms in ERAP1, crucial for peptide trimming in antigen presentation, have been implicated in AS.
Purpose of the Study:
- To investigate the role of ERAP1 polymorphisms and allotypes in Ankylosing Spondylitis.
- To determine if specific ERAP1 allotypes are associated with AS and if they affect peptide processing.
- To elucidate the contribution of ERAP1 to the pathogenesis of AS.
Main Methods:
- Analysis of ERAP1 single nucleotide polymorphisms and allotypes in AS patients and controls.
- Assessment of codominant expression of ERAP1 alleles.
- Functional assays to evaluate the peptide-trimming efficiency of ERAP1 allotype pairs.
Main Results:
- ERAP1 exhibits significant polymorphism, with distinct allotypes showing varied prevalence in AS cases versus controls.
- Codominant expression of ERAP1 alleles allowed for clear stratification of AS patients based on allotype pairs.
- AS-associated ERAP1 allotype pairs demonstrated reduced ability to generate optimal peptide ligands for MHC class I molecules, including HLA-B*2705.
Conclusions:
- Polymorphic ERAP1 significantly influences an individual's predisposition to Ankylosing Spondylitis.
- ERAP1's role in the antigen processing pathway, specifically its impact on peptide trimming, is a key factor in AS pathogenesis.
- Understanding ERAP1 allotypes provides new insights into the genetic basis of AS and potential therapeutic targets.
Related Concept Videos
01:39Epistasis
51.7K
In addition to multiple alleles at the same locus influencing traits, numerous genes or alleles at different locations may interact and influence phenotypes in a phenomenon called epistasis. For example, rabbit fur can be black or brown depending on whether the animal is homozygous dominant or heterozygous at a TYRP1 locus. However, if the rabbit is also homozygous recessive at a locus on the tyrosinase gene (TYR), it will have an unshaded coat that appears white, regardless of its TYRP1...
51.7K
01:49Multiple Allele Traits
39.3K
The Concept of Multiple Allelism
39.3K
01:09Epistasis Analysis
6.3K
Although Mendel chose seven unrelated traits in peas to study gene segregation, most traits involve multiple gene interactions that create a spectrum of phenotypes. When the interaction of various genes or alleles at different locations influences a phenotype, this is called epistasis. Epistasis often involves one gene masking or interfering with the expression of another (antagonistic epistasis). Epistasis often occurs when different genes are part of the same biochemical pathway. The...
6.3K
01:28Diversity of Antigen Receptors
2.2K
Antigen receptors are essential components of the immune system crucial in defending the body against foreign invaders. These receptors are present on the surface of B and T cells, enabling them to recognize antigens and mount an appropriate immune response.
Before encountering any antigen, lymphocytes express these receptors. On B cells, the antigen receptor is a membrane-bound antibody molecule called BCR; on T cells, it is a T cell receptor or TCR. B and T cell receptors are composed of two...
Before encountering any antigen, lymphocytes express these receptors. On B cells, the antigen receptor is a membrane-bound antibody molecule called BCR; on T cells, it is a T cell receptor or TCR. B and T cell receptors are composed of two...
2.2K