A detailed characterization of the sequence traits for both SIDER subfamilies unveils major differences. The SIDER1 subfamily is more heterogeneous and shows an evolutionary link with vestigial DIRE retroposons as previously observed for the ingi/RIME and L1Tc/NARTc couples identified in the T. brucei and T. cruzi genomes, whereas no identified DIREs are related to SIDER2 sequences. Although SIDER1s and SIDER2s display equivalent genomic distribution globally, the varying degrees of sequence conservation, preferential genomic disposition, and differential association to orthologous genes allude to an intricate web of SIDER assimilation in these parasitic organisms.
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Smith et al. (2009) studied this question.
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