scholarly journals Likely Scenarios of Intron Evolution

2005 ◽  
pp. 47-60 ◽  
Author(s):  
Miklós Csűrös
Keyword(s):  
Intron Evolution

scholarly journals Selective Constraints on Intron Evolution in Drosophila

Genetics ◽  
2003 ◽  
Vol 165 (4) ◽  
pp. 1843-1851 ◽  
Author(s):  
John Parsch
Keyword(s):  
Drosophila Melanogaster ◽  
Natural Selection ◽  
Common Ancestor ◽  
Length Distribution ◽  
Short Length ◽  
Intron Length ◽  
Intron Evolution ◽  
Intron Size ◽  
Duplicated Genes ◽  
Selective Constraints

AbstractIntron sizes show an asymmetrical distribution in a number of organisms, with a large number of “short” introns clustered around a minimal intron length and a much broader distribution of longer introns. In Drosophila melanogaster, the short intron class is centered around 61 bp. The narrow length distribution suggests that natural selection may play a role in maintaining intron size. A comparison of 15 orthologous introns among species of the D. melanogaster subgroup indicates that, in general, short introns are not under greater DNA sequence or length constraints than long introns. There is a bias toward deletions in all introns (deletion/insertion ratio is 1.66), and the vast majority of indels are of short length (<10 bp). Indels occurring on the internal branches of the phylogenetic tree are significantly longer than those occurring on the terminal branches. These results are consistent with a compensatory model of intron length evolution in which slightly deleterious short deletions are frequently fixed within species by genetic drift, and relatively rare larger insertions that restore intron length are fixed by positive selection. A comparison of paralogous introns shared among duplicated genes suggests that length constraints differ between introns within the same gene. The janusA, janusB, and ocnus genes share two short introns derived from a common ancestor. The first of these introns shows significantly fewer indels than the second intron, although the two introns show a comparable number of substitutions. This indicates that intron-specific selective constraints have been maintained following gene duplication, which preceded the divergence of the D. melanogaster species subgroup.

scholarly journals Intron evolution inNeurospora: the role of mutational bias and selection

2014 ◽  
Vol 25 (1) ◽  
pp. 100-110 ◽  
Author(s):  
Yu Sun ◽  
Carrie A. Whittle ◽  
Pádraic Corcoran ◽  
Hanna Johannesson
Keyword(s):  
Mutational Bias ◽  
Intron Evolution

scholarly journals Genome Sequencing of the Phytoseiid Predatory MiteMetaseiulus occidentalisReveals Completely AtomizedHoxGenes and Superdynamic Intron Evolution

2016 ◽  
Vol 8 (6) ◽  
pp. 1762-1775 ◽  
Author(s):  
Marjorie A. Hoy ◽  
Robert M. Waterhouse ◽  
Ke Wu ◽  
Alden S. Estep ◽  
Panagiotis Ioannidis ◽  
...  
Keyword(s):  
Genome Sequencing ◽  
Intron Evolution

Comparison of transfer RNA and ribosomal RNA intron splicing in the extreme thermophile and archaebacterium Desulfurococcus mobilis

1989 ◽  
Vol 35 (1) ◽  
pp. 210-214 ◽  
Author(s):  
Jørgen Kjems ◽  
Jonna Jensen ◽  
Tina Olesen ◽  
Roger A. Garrett
Keyword(s):  
Structural Feature ◽  
Ribosomal Rna ◽  
Structural Features ◽  
Intron Evolution ◽  
Extreme Thermophile ◽  
Cleavage Process ◽  
Cleavage Enzyme ◽  
Intron Boundary ◽  
23S Ribosomal Rna ◽  
Common Structural Feature

The structure of the exon–intron boundary was compared for an intron within 23S ribosomal RNA of Desulfurococcus mobilis and a newly discovered intron in tRNAMet from the same organism. The occurrence of a putative common structural feature suggests that intron excision occurs by the same mechanism. The possible recognition of this structural feature by the cleavage enzyme was investigated for the ribosomal RNA intron using RNA substrates exhibiting various exon and intron deletions. The results support the involvement of the structural features in the cleavage process. The evolutionary implications of these results are considered.Key words: archaebacteria, tRNA, ribosomal RNA, introns, intron evolution.

scholarly journals Analysis of Ribosomal Protein Gene Structures: Implications for Intron Evolution

PLoS Genetics ◽  
2006 ◽  
Vol 2 (3) ◽  
pp. e25 ◽  
Author(s):  
Maki Yoshihama ◽  
Akihiro Nakao ◽  
Hung D Nguyen ◽  
Naoya Kenmochi
Keyword(s):  
Ribosomal Protein ◽  
Protein Gene ◽  
Ribosomal Protein Gene ◽  
Intron Evolution ◽  
Gene Structures

Actin phylogeny of foraminifera and intron evolution

2006 ◽  
Vol 29 (1) ◽  
pp. 188-188
Author(s):  
J Flakowski ◽  
J Fahrni ◽  
I Bolivar ◽  
J Pawlowski
Keyword(s):  
Intron Evolution
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