On the Function of Trans-Splicing: No Evidence for Widespread Proteome Diversification in Trypanosomes.

Abstract:

:A long-standing mystery of genomic/transcriptomic structure involves spliced leader trans-splicing (SLTS), in which short RNA "tags" transcribed from a distinct genomic locus is added near the 5' end of RNA transcripts by the spliceosome. SLTS has been observed in diverse eukaryotes in a phylogenetic pattern implying recurrent independent evolution. This striking convergence suggests important functions for SLTS, however no general novel function is known. Recent findings of frequent alternative SLTS (ALT-TS) suggest that ALT-TS could impart widespread functionality. Here, we tested the hypothesis that ALT-TS diversifies proteomes by comparing splicing patterns in orthologous genes between two deeply diverged trypanosome parasites. We also tested proteome diversification functions of ALT-TS by utilizing ribosome profiling sequence data. Finally, we investigated ALT-TS as a mechanism to regulate the expression of unproductive transcripts. Although our results indicate the functional importance of some cases of trans-splicing, we find no evidence for the hypothesis that proteome diversification is a general function of trans-splicing.

journal_name

Genome Biol Evol

authors

Soulette CM,Oliverio O,Roy SW

doi

10.1093/gbe/evz217

subject

Has Abstract

pub_date

2019-10-01 00:00:00

pages

3014-3021

issue

10

issn

1759-6653

pii

5585009

journal_volume

11

pub_type

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