Introns have less to almost zero selection pressure. If this is the case why as we evolve the number introns increase?
Interesting question! Time to dig into the literature. Here are a few papers to get you started.
Article The Origin of Introns and Their Role in Eukaryogenesis: A Co...
Article Analysis of evolution of exon-intron structure of eukaryotic genes
Article Origin and evolution of spliceosomal introns
Enjoy!
Hi Shivaani,
if it is recognized that selection pressure acts principally on coding and regulating sequences, the point is functional and structural since number of introns will directly depends on number of exons.
fred
I support Katie advice and can add one more item for reading:
Jo BS, Choi SS. Introns: The Functional Benefits of Introns in Genomes. Genomics Inform. 2015 Dec;13(4):112-8. doi: 10.5808/GI.2015.13.4.112.
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