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Sequence analysis and expression patterns divide the maize knotted1-like homeobox genes into two classes
R Kerstetter1, E Vollbrecht, B Lowe
1Department of Plant Biology, University of California, Berkeley 94720.
The Plant Cell
|December 1, 1994
Summary
Researchers identified 12 maize knotted1-like genes, classifying them into two groups based on homeodomain similarity. Class 1 genes are primarily expressed in meristems, while Class 2 genes show broader tissue expression, revealing insights into maize gene regulation.
Area of Science:
- Plant Molecular Biology
- Genetics
- Developmental Biology
Background:
- The knotted1 (kn1) gene plays a crucial role in maize development.
- Understanding the regulation of homeobox genes is key to deciphering plant development.
Purpose of the Study:
- To identify and characterize novel kn1-like homeobox genes in maize.
- To investigate the sequence diversity, expression patterns, and genomic distribution of these genes.
Main Methods:
- Isolation of 12 kn1-like sequences using the kn1 homeobox as a probe.
- Sequence analysis to determine amino acid identity and classify genes.
- RNA gel blot analysis to study gene expression patterns.
- Mapping of genes using recombinant inbred populations.
Main Results:
- 12 kn1-like genes were identified with homeodomain similarities ranging from 55-89%.
- Genes were classified into Class 1 (highly similar to kn1, meristem-enriched expression) and Class 2 (less similar, broader expression).
- Genes are clustered on chromosomes 1 and 8, with others distributed genome-wide; some pairs map to duplicated regions.
Conclusions:
- The study reveals a family of kn1-like homeobox genes in maize with distinct sequence, expression, and genomic organization.
- Differential expression patterns suggest specialized roles in plant development, particularly in meristematic tissues.
- Gene duplication and clustering may contribute to the evolution and functional diversification of these important developmental regulators.