Dataset Information

Organization and evolution of the Cyp2 gene cluster on mouse chromosome 7, and comparison with the syntenic human cluster.

ABSTRACT: Genes from the cytochrome P450 (CYP) superfamily encode a diverse group of monooxygenases that play important roles in both endogenous processes and in the metabolism of exogenous compounds, including most drugs. A cluster of Cyp2 genes on mouse chromosome 7 was mapped and analyzed in detail and compared with the homologous cluster on human chromosome 19. The mouse cluster includes 22 loci from the same six CYP2 subfamilies--Cyp2a, Cyp2b, Cyp2f, Cyp2g, Cyp2s, Cyp2t--that are found in the human cluster. Twelve of these loci are functional genes, and 10 are pseudogenes. Parts of the mouse and human gene clusters are similarly arranged, but the data indicate that a significantly different series of duplication events created the modern gene organizations in the two species. The comparison of the mouse and human clusters provides new insights into the evolution of gene families, whereas the detailed analysis provides background information that should be informative for future studies on the expression, regulation, and function of specific mouse Cyp2 genes.

SUBMITTER: Wang H

PROVIDER: S-EPMC1241748 | biostudies-other | 2003 Nov

REPOSITORIES: biostudies-other

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Organization and evolution of the Cyp2 gene cluster on mouse chromosome 7, and comparison with the syntenic human cluster.

Wang Haoyi H Donley Kyle M KM Keeney Diane S DS Hoffman Susan M G SM

Environmental health perspectives 20031101 15

Genes from the cytochrome P450 (CYP) superfamily encode a diverse group of monooxygenases that play important roles in both endogenous processes and in the metabolism of exogenous compounds, including most drugs. A cluster of Cyp2 genes on mouse chromosome 7 was mapped and analyzed in detail and compared with the homologous cluster on human chromosome 19. The mouse cluster includes 22 loci from the same six CYP2 subfamilies--Cyp2a, Cyp2b, Cyp2f, Cyp2g, Cyp2s, Cyp2t--that are found in the human c ...[more]

PMID: 14630516

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Project description:BACKGROUND: Most disease-resistance (R) genes in plants encode NBS-LRR proteins and belong to one of the largest and most variable gene families among plant genomes. However, the specific evolutionary routes of NBS-LRR encoding genes remain elusive. Recently in coffee tree (Coffea arabica), a region spanning the SH3 locus that confers resistance to coffee leaf rust, one of the most serious coffee diseases, was identified and characterized. Using comparative sequence analysis, the purpose of the present study was to gain insight into the genomic organization and evolution of the SH3 locus. RESULTS: Sequence analysis of the SH3 region in three coffee genomes, Ea and Ca subgenomes from the allotetraploid C. arabica and Cc genome from the diploid C. canephora, revealed the presence of 5, 3 and 4 R genes in Ea, Ca, and Cc genomes, respectively. All these R-gene sequences appeared to be members of a CC-NBS-LRR (CNL) gene family that was only found at the SH3 locus in C. arabica. Furthermore, while homologs were found in several dicot species, comparative genomic analysis failed to find any CNL R-gene in the orthologous regions of other eudicot species. The orthology relationship among the SH3-CNL copies in the three analyzed genomes was determined and the duplication/deletion events that shaped the SH3 locus were traced back. Gene conversion events were detected between paralogs in all three genomes and also between the two sub-genomes of C. arabica. Significant positive selection was detected in the solvent-exposed residues of the SH3-CNL copies. CONCLUSION: The ancestral SH3-CNL copy was inserted in the SH3 locus after the divergence between Solanales and Rubiales lineages. Moreover, the origin of most of the SH3-CNL copies predates the divergence between Coffea species. The SH3-CNL family appeared to evolve following the birth-and-death model, since duplications and deletions were inferred in the evolution of the SH3 locus. Gene conversion between paralog members, inter-subgenome sequence exchanges and positive selection appear to be the major forces acting on the evolution of SH3-CNL in coffee trees.

Dataset Information

Organization and evolution of the Cyp2 gene cluster on mouse chromosome 7, and comparison with the syntenic human cluster.

Publications

Organization and evolution of the Cyp2 gene cluster on mouse chromosome 7, and comparison with the syntenic human cluster.

Similar Datasets

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