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The Irreducibly Complex Genome: Designed from the Beginning

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The concept of what comprises a gene and how it works has changed markedly since the beginning of the modern genomics era about 35 years ago when the first viral gene was sequenced.1 Since then, entire microbial, plant, and animal genomes have been sequenced.

When research into gene function began, it was widely assumed that a one-to-one relationship existed between genes and their RNA and protein products. However, genome sequencing projects soon revealed that the large number of RNAs and corresponding proteins being discovered were hundreds of times more numerous than the number of genes found in the DNA sequence. We now know that this is due to the many complex mechanisms associated with gene function. In plants and animals, a gene typically produces a messenger RNA (transcript) from multiple segments of DNA in a gene region. These coding segments are called exons, while the non-coding segments (introns) are spliced out in the processing of RNA. A single gene region can produce a variety of transcripts by adding, multiplying, or eliminating exons in a process called alternative splicing (see Figure 1). For example, three neurexin genes in humans can produce over 3,000 different transcripts.2

This author is currently summarizing key points from secular research in the area of gene function to produce a literature review for journal publication that demonstrates the irreducible complexity of gene function. This project will show that concepts of genome evolution are incredibly oversimplified, disregarding the immense levels of functional complexity unveiled by just a few decades of genomics research….

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