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BMC Genomics

, 7:37

First Online: 28 February 2006Received: 31 July 2005Accepted: 28 February 2006


BackgroundThe ribosome is a central player in the translation system, which in mammals consists of four RNA species and 79 ribosomal proteins RPs. The control mechanisms of gene expression and the functions of RPs are believed to be identical. Most RP genes have common promoters and were therefore assumed to have a unified gene expression control mechanism.

ResultsWe systematically analyzed the homogeneity and heterogeneity of RP genes on the basis of their expression profiles, promoter structures, encoded amino acid compositions, and codon compositions. The results revealed that 1 most RP genes are coordinately expressed at the mRNA level, with higher signals in the spleen, lymph node dissection LND, and fetal brain. However, 17 genes, including the P protein genes RPLP0, RPLP1, RPLP2, are expressed in a tissue-specific manner. 2 Most promoters have GC boxes and possible binding sites for nuclear respiratory factor 2, Yin and Yang 1, and-or activator protein 1. However, they do not have canonical TATA boxes. 3 Analysis of the amino acid composition of the encoded proteins indicated a high lysine and arginine content. 4 The major RP genes exhibit a characteristic synonymous codon composition with high rates of G or C in the third-codon position and a high content of AAG, CAG, ATC, GAG, CAC, and CTG.

ConclusionEleven of the RP genes are still identified as being unique and did not exhibit at least some of the above characteristics, indicating that they may have unknown functions not present in other RP genes. Furthermore, we found sequences conserved between human and mouse genes around the transcription start sites and in the intronic regions. This study suggests certain overall trends and characteristic features of human RP genes.

Electronic supplementary materialThe online version of this article doi:10.1186-1471-2164-7-37 contains supplementary material, which is available to authorized users.

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Autor: Kyota Ishii - Takanori Washio - Tamayo Uechi - Maki Yoshihama - Naoya Kenmochi - Masaru Tomita


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