Abstract:
:Intron number varies considerably among genomes, but despite their fundamental importance, the mutational mechanisms and evolutionary processes underlying the expansion of intron number remain unknown. Here we show that Drosophila, in contrast to most eukaryotic lineages, is still undergoing a dramatic rate of intron gain. These novel introns carry significantly weaker splice sites that may impede their identification by the spliceosome. Novel introns are more likely to encode a premature termination codon (PTC), indicating that nonsense-mediated decay (NMD) functions as a backup for weak splicing of new introns. Our data suggest that new introns originate when genomic insertions with weak splice sites are hidden from selection by NMD. This mechanism reduces the sequence requirement imposed on novel introns and implies that the capacity of the spliceosome to recognize weak splice sites was a prerequisite for intron gain during eukaryotic evolution.
journal_name
PLoS Genetjournal_title
PLoS geneticsauthors
Farlow A,Meduri E,Dolezal M,Hua L,Schlötterer Cdoi
10.1371/journal.pgen.1000819subject
Has Abstractpub_date
2010-01-22 00:00:00pages
e1000819issue
1eissn
1553-7390issn
1553-7404journal_volume
6pub_type
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