Pseudogenes in metazoa: origin and features

Briefings in Functional Genomics & Proteomics
Ilenia D'ErricoCecilia Saccone

Abstract

The complete genome sequences with their annotations are a considerable resource in biology, particularly in understanding the global structure of the genetic material at the molecular level. The reason why some eukaryotic genomes contain large quantities of apparently unnecessary DNA, namely pseudogenes, while others seem to invest in more efficient thinning processes or are equipped with protection systems against parasitic elements still remains a mystery. Several genome-wide surveys have been undertaken to identify pseudogenes in the completely sequenced genome, bringing to light some differences both in their amount and distribution. Since pseudogenes are important resources in evolutionary and comparative genomics - as 'molecular fossils' - in this paper, a survey on the origins, features, abundance and localisation of the different pseudogenes is reported. As an example of genes producing processed pseudogenes, some experimental data obtained in the authors' laboratories from the study of a nuclear gene coding for the mitochondrial transcription factor A (mtTFA), a key regulator of mitochondrial biogenesis, are also reported.

Citations

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