How many introns are present on a gene that consists of four exons? three
A fascinating question posed by the intron-exon architecture of many eukaryotic genes is whether this unusual organization has any purpose or if it is only the result of the widespread presence of useless introns in eukaryotic genomes. In this review, we demonstrate how introns in modern species perform a wide range of tasks and are involved in almost all stages of mRNA processing. We suggest that this wide range of intronic functions lends credence to the idea that introns were initially selfish components in early eukaryotes before independently evolving into a wide range of functions in various eukaryotic lineages. Intron positional conservation, a brand-new evolutionary conservation criterion that can recognize functional introns, is what we recommend.
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