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Nucleotide composition in protein-coding and non-coding DNA in the zygomycete Phycomyces blakesleeanus
Luis M Corrochano1, Javier Ruiz-Albert
1Departamento de Genética, Facultad de Biologia, Universidad de Sevilla, Apartado 1095, ES-41080 Sevilla, Spain. corrochano@us.es
Mycological Research
|September 29, 2004
Summary
Researchers visualized protein-coding DNA in Phycomyces blakesleeanus by analyzing guanine-cytosine (GC) content. A significant GC difference between coding and non-coding DNA enabled this visualization, revealing a high GC segment linked to protein kinase C genes.
Area of Science:
- Mycology
- Genomics
- Molecular Biology
Background:
- The zygomycete Phycomyces blakesleeanus possesses a 30 Mb genome with a 35% guanine-cytosine (GC) content.
- Significant variations in GC content exist between coding and non-coding DNA regions within fungal genomes.
Purpose of the Study:
- To analyze the guanine-cytosine (GC) content and nucleotide frequency within Phycomyces blakesleeanus genes.
- To investigate codon usage and identify distinct DNA segments based on GC content.
- To visualize protein-coding DNA by leveraging GC content differences.
Main Methods:
- Determined GC content in Phycomyces genes and gene fragments from public databases.
- Analyzed nucleotide frequency at each codon position.
- Plotted GC content along DNA segments to visualize protein-coding regions.
Main Results:
- Observed an 18% difference in GC content between protein-coding and non-coding DNA.
- Successfully visualized protein-coding DNA segments using GC content variation.
- Identified a high GC DNA segment associated with pyrG genes in Phycomyces, Mucor, and Blakeslea, corresponding to the 3' end of the protein kinase C gene.
Conclusions:
- The substantial GC content difference in Phycomyces blakesleeanus facilitates the identification and visualization of protein-coding DNA.
- A conserved high GC DNA region linked to protein kinase C genes exists across related zygomycete genera.