Sökning: "hypermutation"
Visar resultat 1 - 5 av 23 avhandlingar innehållade ordet hypermutation.
1. Primary Sjögren's Syndrome: Studies of DNA damage responses and autoantibodies
Sammanfattning : Primary Sjögren’s syndrome (SS) is a chronic autoimmune disease of unknown etiology. The disease primarily involves lachrymal and salivary glands, leading to dryness of the eyes and mouth, but a wide spectrum of exocrine and non-exocrine disease manifestations may be seen. LÄS MER
2. Immunoglobulin Gene Analysis in Different B cell Lymphomas : With Focus on Cellular Origin and Antigen Selection
Sammanfattning : B cell lymphoma (BCL) comprises a biologically and clinically heterogeneous group of tumors deriving from different stages of B cell development. The immunoglobulin (Ig) variable heavy chain (VH) gene rearrangement is unique for each BCL and can be used to reveal cellular origin, to study signs of antigen selection and to quantify tumor cell load. LÄS MER
3. Analysis of Immunoglobulin Genes and Telomeres in B cell Lymphomas and Leukemias
Sammanfattning : B cell lymphomas and leukemias are heterogeneous tumors with different cellular origins. Analysis of immunoglobulin (Ig) genes enables insight into the B cell progenitor, as Ig somatic hypermutation correlates with antigen-related B cell transit through the germinal center (GC). LÄS MER
4. Stereotyped B Cell Receptors in Chronic Lymphocytic Leukaemia : Implications for Antigen Selection in Leukemogenesis
Sammanfattning : Biased immunoglobulin heavy variable (IGHV) gene usage and distinctive B-cell receptor (BCR) features have been reported in chronic lymphocytic leukaemia (CLL), which may reflect clonal selection by antigens during disease development. Furthermore, the IGHV gene mutation status distinguishes two clinical entities of CLL, where patients with unmutated IGHV genes have an inferior prognosis compared to those with mutated IGHV genes. LÄS MER
5. Role of DNA repair in class switch recombination and somatic hypermutation
Sammanfattning : Class switch recombination (CSR) and somatic hypermutation (SHM), occurring in the germinal center, are two important processes for B cell development. Both are initiated by activation-induced cytidine deaminase (AID), through deamination of the C residues in the variable and switch regions of the immunoglobulin locus, resulting in either in single stranded or double stranded DNA breaks. LÄS MER