Immunoglobulin Gene Rearrangement - Ohio University
Immunoglobulin Gene Rearrangement Eliza Thapa Huizhi Zhao Jingwen Song General Outline Introduction to immunoglobulin and V(D)J recombination Mechanism of V(D)J recombination
Effect of V(D)J recombination Immunoglobulin (Ig) http://factfile.org/wp-content/uploads/2015/03/Antibodies-Image.jpg serum glycoprotein produced by B cells against foreign molecules foreign molecules- antigen (bacteria, virus, pollens etc) antibody binds to specific antigen occurs in two forms- soluble form - Membrane bound form (BCR)
Structure of Immunoglobulin 2 heavy chains (H) 2 light chains (L) H and L linked by disulfide bonds Two (H-L) chain linked by disulfide bond amino terminal variable (V) region
Carboxyl- terminal constant (C) region www.namrata.co/wp-content/uploads/2012/04/immunoglobulinsstructure.jpeg Types of Immunoglobulin Five classes of immunoglobulins Immunoglobulin D ()) Immunoglobulin E ()) Immunoglobulin G ()) Immunoglobulin M ())
Immunoglobulin A ()) Not found in humans Immunoglobulin Y Immunoglobulin W http://www.nature.com/nrm/journal/v3/n12/box/nrm972_BX1.html Means of Ig Diversity
Somatic hypermutation Combinatorial association of light and heavy chains Combinatorial V-(D)-J joining http://www.microbiologybook.org/mayer/gen-1.jpg V(D)J recombination occurs during B-Cell Development Light chain Gene rearrangement
Heavy chain gene rearrangement How much variation is possible through recombining gene fragments? Over 1.5*107combinations of variable, diversity and joining gene segments are possible. Imprecise recombination and mutation increase the variability into billions of possible combinations Mechanism of Rearrangement
Recombination Signal Sequences (RSSs). Recombination Activating Genes: RAG-1 and RAG-2. 12 Recombination Signal Sequence A short DNA sequence indicate the sites of recombination seven conserved nucleotides (a heptamer) that reside next to
the gene encoding sequence a spacer (containing either 12 or 23 unconserved nucleotides) a conserved nonamer (9 base pairs) Nature Reviews Immunology 11, 251-263 (April 2011) Nature Reviews Immunology 11, 251-263 (April 2011) | doi:10.1038/nri2941 Recombination Signal Sequence
Two types of RSS exist Each V, D, or J gene segment is flanked by RSS The RSSs are present on the 3 side (downstream) of a V region and the 5 side (upstream) of the J region
14 http://biosiva.50webs.org/immunediversity.htm Recombination Activating Gene RAG enzymes work as a multi-subunit complex to induce cleavage of a single double stranded DNA (dsDNA) molecule between the antigen receptor coding segment and a flanking recombination signal sequence (RSS). Schatz, David G., and Patrick C. Swanson. "V (D) J recombination: mechanisms of initiation." Annual review of genetics 45 (2011): 167-202.
V(D)J recombination: (1) a complex containing RAG1 and RAG2 binds one RSS. (2) This RAG-RSS complex then captures the second RSS (of the gene segment to be joined) in a process known as synapsis. (3) Cleavage by RAG1/2 occurs between the RSS heptamer and flanking coding sequence, and proceeds in two steps. A nick is made at the 5 end of the RSS heptamer. The second step is a hairpinning step joining the 3-hydroxyl to the
phosphoryl group at the same nucleotide position on the other strand. (4) DNA cleavage is completed within the synaptic complex. (5) The product of this first phase of V(D)J recombination is the cleaved signal complex, which contains four DNA ends: two blunt 5phosphorylated signal ends, and two coding ends terminating in DNA hairpin structures. Nature Reviews Immunology 8, 302-312 (April 2008) V(D)J recombination:
During the second phase of V(D)J recombination, RAG1 and RAG2 work together with DNA repair proteins to process and ligate coding ends to form a coding joint, and ligate signal ends to form a signal joint. This phase requires ubiquitously expressed DNA repair factors of the non-homologous end joining (NHEJ) pathway.
Nature Reviews Immunology 8, 302-312 (April 2008) Products of V(D)J recombination: Roth, David B. "V (D) J Recombination: Mechanism, Errors, and Fidelity."Microbiology Spectrum 2.6 (2014). 18 V(D)J Recombination Errors: The two types of V(D)J recombination errors:
Errors in Target Recognition Errors in End Joining Errors in Target Recognition: In lymphoid neoplasms cryptic RSS(CRSS) cRSSs capable of supporting recombination are present approximately once per kilobase
in random DNA sequences small size of RSS sequences; strict adherence of this sequence to consensus heptamer or
nonamer sequence mismatching of RSSs and cRSSs that are adjacent to proto-oncogenes Roth D. 2014. V(D)J Recombination: Mechanism, Errors, and Fidelity Errors in Joining: A pair of breaks created during normal V(D)J recombination
are mistakenly joined to another break created by another mechanism Errors in joining involve events that join a RAG-mediated double-strand break to a broken DNA end created by a non-RAG-mediated mechanism Roth D. 2014. V(D)J Recombination: Mechanism, Errors, and Fidelity
Summary 1. V(D)J Recombination provide a method to create an almost limitless supply of different antibodies to target antigens associated with pathogens 2.Aberrent V(D)J Recombination like errors in target recognition and errors in End Joining, can play important roles in initiating
oncogenic transformation Reference https://www.youtube.com/watch?v=QTOBSFJWogE Roth D. 2014. V(D)J Recombination: Mechanism, Errors, and Fidelity Nature Reviews Immunology 8, 302-312 (April 2008) Schatz, David G., and Patrick C. Swanson. "V (D) J recombination: mechanisms of initiation." Annual review of genetics 45 (2011): 167-202.
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