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Clustered Xenopus keratin genes: A genomic, transcriptomic, and proteomic analysis
Ken-Ichi T Suzuki1, Miyuki Suzuki1, Mitsuki Shigeta1
1Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan.
Developmental Biology
|November 16, 2016
Summary
Researchers identified 120 keratin genes in Xenopus species, revealing their clustered arrangement on chromosomes and unique expression patterns. This study sheds light on keratin gene evolution and adaptation in terrestrial vertebrates.
Area of Science:
- Evolutionary developmental biology
- Genomics and bioinformatics
- Molecular and cell biology
Background:
- Keratin genes are crucial intermediate filaments in vertebrate epithelial cells, with expression varying during development.
- Keratin genes are classified into type I and II and are known to cluster on genomes.
- Understanding keratin gene evolution in amphibians like Xenopus is vital for comprehending terrestrial vertebrate evolution.
Purpose of the Study:
- To identify and characterize type I and II keratin genes in two Xenopus species.
- To investigate the genomic organization and evolutionary conservation of these keratin genes.
- To analyze the expression patterns and protein identification of keratin genes during development and in different tissues.
Main Methods:
- Genome data analysis to identify putative keratin genes in Xenopus laevis and Xenopus tropicalis.
- RNA-sequencing (RNA-Seq) to determine gene expression profiles across various developmental stages and adult tissues.
- Shotgun proteomics to identify epidermal keratin proteins from different developmental stages and tissues.
Main Results:
- Identification of 120 putative type I and II keratin genes in the two Xenopus species.
- Demonstration that these keratin genes are highly clustered on specific homeologous chromosomes, exhibiting conserved synteny with human chromosomes.
- Detailed expression profiles revealed stage- and tissue-specific patterns for orthologous and homeologous keratin genes.
- Identification of numerous epidermal keratin proteins using proteomics.
Conclusions:
- The clustered organization and conserved synteny of keratin genes suggest significant evolutionary pressures.
- Unique expression patterns of keratin genes are closely linked to epidermal development and terrestrial adaptation in amphibians.
- This research provides insights into keratin gene evolution, diversification, and Xenopus speciation.
