Abstract
Tapasin (TAPBP) is a key member of MHC class Ia antigen-loading complexes, bridging the class Ia molecule to the transporter associated with antigen presentation (TAP). As part of an ongoing study of MHC genomics in rainbow trout, we have identified two rainbow trout TAPBP genes (Onmy-TAPBP.a and .b) and a similar but distinct TAPBP-related gene (Onmy-TAPBP-R) that had previously only been described in mammals. Physical and genetic mapping indicate that Onmy-TAPBP.a is on chromosome 18 in the MHC class Ia region and that Onmy-TAPBP.b resides on chromosome 14 in the MHC class Ib region. There are also at least two copies of TAPBP-R, Onmy-TAPBP-R.a and Onmy-TAPBP-R.b, located on chromosomes 2 and 3, respectively. Due to the central role of TAPBP expression during acute viral infection, we have characterized the transcriptional profile and regulatory regions for both Onmy-TAPBP and Onmy-TAPBP-R. Transcription of both genes increased during acute infection with infectious hematapoeitic necrosis virus (IHNV) in a fashion indicative of interferon-mediated regulation. Promoter–reporter assays in STE-137 cells demonstrate that the trout TAPBP and TAPBP-R promoters respond to interferon regulatory factors, Onmy-IRF1 and Onmy-IRF2. Overall, TAPBP is expressed at higher levels than TAPBP-R in naïve tissues and TAPBP transcription is more responsive to viral infection and IRF1 and 2 binding.
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This project was supported by National Research Initiative Grant no. 2003-35205-15072 from the USDA Cooperative State Research, Education, and Extension Service and internal base funds provided by the Department of the Interior.
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The following sequences have been deposited in GenBank: DQ092322–330 and DQ288281.
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Landis, E.D., Palti, Y., Dekoning, J. et al. Identification and regulatory analysis of rainbow trout tapasin and tapasin-related genes. Immunogenetics 58, 56–69 (2006). https://doi.org/10.1007/s00251-005-0070-5
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DOI: https://doi.org/10.1007/s00251-005-0070-5