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Human proteins evolving slowly thanks to multitasking genes

Many human proteins are not as good as they might be because the gene sequences that code for them have a double role which slows down the rate at which they evolve, according to new research published in PLoS Biology.

By tweaking these dual role regions, scientists could develop gene therapy techniques that produce proteins that are even better than those found in nature, and could one day be used to help people recover from genetic disorders.

The stretch of DNA which codes for a specific protein is often interrupted by sections of apparently useless DNA -- known as introns -- which need to be edited out in order to produce a new protein.

Recently it has been discovered that some of the instructions on where to splice and re-splice the DNA in this editing process are contained in the coding section, or exon, of the DNA itself.

So, as well as spelling out which amino acids are needed to produce a specific protein, the part of the exon immediately next to the intron contains information that is essential for the gene editing process.

This means that these parts of genes evolve particularly slowly, making the proteins they encode for not as good as they could be had evolutionary processes been more able to improve them over time.

"Our research suggests that a gene with many exons would evolve at under half the rate of the same one that had no introns, simply owing to the need to specify where to remove introns," said Professor Laurence Hurst from the University of Bath (UK), who worked with colleagues from the University of Lausanne (Switzerland) on the project.

"This is one of the strongest predictors of rates of protein evolution known, indicating that this dual coding role is vastly more influential than previously believed."

The finding could have major implications for medicine and the development of gene therapy techniques in which people with a defective gene are given the
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Contact: Andrew McLaughlin
a.mclaughlin@bath.ac.uk
44-012-253-86883
University of Bath
5-Feb-2007


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