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Characterization and mapping of the Xiphophorus maculatus (Teleostei: Poeciliidae) RPS15 gene
R B Walter1, R D Obermoeller, D D Moore
1Department of Biology, Southwest Texas State University, San Marcos, USA.
Abstract:
We have determined the nucleotide sequence and gene map location of the Xiphophorus maculatus homologue of RPS15 (ribosomal protein S15, alias RIG). The Xiphophorus RPS15 cDNA encodes 145 amino acids, which show 94% identity compared to deduced mammalian and avian RPS15 amino acid sequences. At the nucleotide level, 84% sequence identity is maintained between the fish and human gene, while homologous amphibian and avian sequences show about 80% nucleotide identity compared to the Xiphophorus sequence. Nucleotide identity substantially decreases when the fish gene is compared to Arabidopsis S15 (64%) and yeast S21 (55%) genes. Genetic linkage analysis of an RPS15 restriction fragment length polymorphism in backcross hybrids generated from the cross X. helleri x (X. maculatus Jp 163 B x X. helleri) demonstrated linkage of Xiphophorus RPS15 to the EGFR, UMPK and YES loci in Xiphophorus Linkage Group VI.
Insights
Researchers mapped the Xiphophorus maculatus RPS15 gene, finding high amino acid identity with mammals and birds. This ribosomal protein S15 gene links to specific loci in fish, aiding comparative genomics.
Area of Science:
- Genomics
- Comparative genomics
- Molecular biology
Background:
- Ribosomal protein S15 (RPS15) is crucial for protein synthesis.
- Understanding RPS15 conservation across species aids in evolutionary studies.
- Xiphophorus maculatus provides a model for fish genetics.
Purpose of the Study:
- To determine the nucleotide sequence of the Xiphophorus maculatus RPS15 homologue.
- To map the genetic location of the Xiphophorus RPS15 gene.
- To compare RPS15 sequence identity across diverse species.
Main Methods:
- Nucleotide sequencing of Xiphophorus maculatus RPS15 cDNA.
- Bioinformatic analysis of sequence identity with mammalian, avian, amphibian, plant, and yeast RPS15 sequences.
- Genetic linkage analysis using restriction fragment length polymorphism in backcross hybrids.
Main Results:
- The Xiphophorus RPS15 cDNA encodes 145 amino acids with 94% identity to mammalian and avian RPS15.
- High nucleotide identity (84%) was observed between Xiphophorus and human RPS15.
- Xiphophorus RPS15 was linked to EGFR, UMPK, and YES loci in Linkage Group VI.
Conclusions:
- The Xiphophorus RPS15 gene is highly conserved across vertebrates at the amino acid level.
- Genetic mapping places Xiphophorus RPS15 within a known linkage group, facilitating further genetic studies.
- This research contributes to understanding ribosomal protein evolution and fish genetics.