A KNOX family TALE.

Area of Science:

• Plant molecular biology
• Genetics
• Developmental biology

Background:

• The Knotted1 (Kn1) gene was the first plant homeobox gene identified, originating from maize mutants with abnormal leaf tissue.
• The Knotted1-like homeobox (KNOX) gene family is crucial for plant development.
• Recent discoveries include KNOX gene family members that lack the characteristic homeobox domain.

Purpose of the Study:

• To explore the implications of newly identified KNOX genes lacking a homeobox.
• To investigate the regulatory mechanisms governing KNOX gene expression.
• To understand the role of epigenetic factors and protein interactions in KNOX gene function.

Main Methods:

• Comparative genomics to identify new KNOX family members.
• Molecular assays to study gene regulation.
• Epigenetic analysis to investigate silencing mechanisms.
• Protein-protein interaction studies.

Main Results:

• Expansion of the KNOX gene family to include non-homeobox members.
• Identification of direct regulation of KNOX genes by myb-related ARP proteins.
• Evidence of epigenetic silencing of KNOX genes by polycomb repressive complexes.

Conclusions:

• The KNOX gene family is more diverse than previously thought, with implications for gene function.
• KNOX gene expression is tightly controlled by both protein interactions and epigenetic mechanisms.
• Further research into these regulatory pathways will illuminate plant development.