This study characterizes immunoglobulin light chain (IgL) expression and variable family usage in rainbow trout. IgL transcripts were generated by 5’ RACE from both immune and TNP-KLH immunized fish. Phylogenetic analysis revealed that the IgL variable regions clustered into seven different families: three kappa families (two newly described in this study), three sigma families, and a single lambda family. IgL1 and IgL3 transcripts expressing identical variable regions were identified and genomic analysis revealed that the two isotypes are co-localized on chromosomes 7, 15, 18, and 21 allowing for potential rearrangement between clusters. Fish were immunized with TNP-KLH (n = 5) and percent expression of IgL1, IgL2, IgL3, and IgL4 measured by qRT-PCR from immune tissues and magnetically sorted TNP-specific lymphocyte populations. In all samples IgL1 constituted 80–95% of the transcripts. The percentage of anti-TNP specific IgL1 transcripts was measured in naïve, unsorted, and TNP-specific cell populations of TNP-KLH fish (n = 3) and found to be significantly higher in the TNP positive cell population (21%) compared to the naïve population (1%; p = 0.02) suggesting that there is a selection of TNP specific IgL sequences.
Citation Information
Publication Year | 2019 |
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Title | Characterization of immunoglobulin light chain utilization and variable family diversity in rainbow trout |
DOI | 10.1016/j.dci.2019.103566 |
Authors | Katherine Rego, Eva Bengtén, Melanie Wilson, John D. Hansen, Erin S Bromage |
Publication Type | Article |
Publication Subtype | Journal Article |
Series Title | Developmental and Comparative Immunology |
Index ID | 70209063 |
Record Source | USGS Publications Warehouse |
USGS Organization | Western Fisheries Research Center |