RCPdb: An evolutionary classification and codon usage database for repeat-containing proteins

Noel Garry Faux, Gavin A Huttley, Khalid Mahmood, Geoffrey Webb, Maria Jose Garcia De La Banda, James Whisstock

Research output: Contribution to journalArticleResearchpeer-review

33 Citations (Scopus)

Abstract

Over 3 of human proteins contain single amino acid repeats (repeat-containing proteins, RCPs). Many repeats (homopeptides) localize to important proteins involved in transcription, and the expansion of certain repeats, in particular poly-Q and poly-A tracts, can also lead to the development of neurological diseases. Previous studies have suggested that the homopeptide makeup is a result of the presence of G+C-rich tracts in the encoding genes and that expansion occurs via replication slippage. Here, we have performed a large-scale genomic analysis of the variation of the genes encoding RCPs in 13 species and present these data in an online database (http://repeats.med.monash.edu.au/genetic_analysis/). This resource allows rapid comparison and analysis of RCPs, homopeptides, and their underlying genetic tracts across the eukaryotic species considered. We report three major findings. First, there is a bias for a small subset of codons being reiterated within homopeptides, and there is no G+C or A+T bias relative to the organism s transcriptome. Second, single base pair transversions from the homocodon are unusually common and may represent a mechanism of reducing the rate of homopeptide mutations. Third, homopeptides that are conserved across different species lie within regions that are under stronger purifying selection in contrast to nonconserved homopeptides.
Original languageEnglish
Pages (from-to)1118 - 1127
Number of pages10
JournalGenome Research
Volume17
Issue number7
Publication statusPublished - 2007

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