TRA2-beta gene contains 10 exons and spans 21 kb. RT-PCR and analysis of TRA2-beta cDNAs in the EST database indicated that 5 different TRA2-beta RNA isoforms are generated by alternative splicing.
TRA2-beta-1 is a nuclear protein that colocalizes with SC35 in a speckled pattern. It interacts with several SR proteins in yeast. A second isoform, named TRA2-beta-2, is generated by alternative splicing. This isoform gives rise to a truncated protein without an SR domain. Both isoforms are evenly distributed throughout adult rat tissue. The ratio of these 2 isoforms changes after stimulation of primary human T-cell and primary rat spleen cell cultures, indicating that alternative splicing is involved in the regulation of TRA2-beta activity.
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