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- W2106959091 abstract "ABSTRACT Splicing of mRNA is an ancient and evolutionarily conserved process in eukaryotic organisms, but intron-exon structures vary. Plasmodium falciparum has an extreme AT nucleotide bias (>80%), providing a unique opportunity to investigate how evolutionary forces have acted on intron structures. In this study, we developed an in vivo luciferase reporter splicing assay and employed it in combination with lariat isolation and sequencing to characterize 5′ and 3′ splicing requirements and experimentally determine the intron branch point in P. falciparum . This analysis indicates that P. falciparum mRNAs have canonical 5′ and 3′ splice sites. However, the 5′ consensus motif is weakly conserved and tolerates nucleotide substitution, including the fifth nucleotide in the intron, which is more typically a G nucleotide in most eukaryotes. In comparison, the 3′ splice site has a strong eukaryotic consensus sequence and adjacent polypyrimidine tract. In four different P. falciparum pre-mRNAs, multiple branch points per intron were detected, with some at U instead of the typical A residue. A weak branch point consensus was detected among 18 identified branch points. This analysis indicates that P. falciparum retains many consensus eukaryotic splice site features, despite having an extreme codon bias, and possesses flexibility in branch point nucleophilic attack." @default.
- W2106959091 created "2016-06-24" @default.
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- W2106959091 date "2011-11-01" @default.
- W2106959091 modified "2023-09-27" @default.
- W2106959091 title "Branch Point Identification and Sequence Requirements for Intron Splicing in Plasmodium falciparum" @default.
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- W2106959091 doi "https://doi.org/10.1128/ec.05193-11" @default.
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