Cre recombinase expression can result in phenotypic aberrations in plants

Area of Science:

• Plant biotechnology
• Molecular biology
• Genetics

Background:

• The Cre-lox system is a powerful tool for genetic manipulation in various organisms.
• Understanding the impact of recombinase expression on plant development is crucial for its effective application.

Purpose of the Study:

• To investigate the effects of Cre recombinase expression on plant development in tomato, petunia, and Nicotiana tabacum.
• To determine the correlation between Cre expression timing and observed phenotypic abnormalities.

Main Methods:

• Stable transformation of plants with the cre recombinase gene under the control of the CaMV 35S promoter.
• Analysis of plant growth, leaf chlorosis, and transgene co-segregation.
• Correlation of phenotype severity with Cre mRNA levels and timing of expression during organogenesis.

Main Results:

• Cre expression driven by the CaMV 35S promoter led to growth retardation and chlorosis in transgenic plants.
• Phenotype severity correlated with the timing of Cre expression during organogenesis, particularly early expression in tomato.
• No aberrant phenotypes were observed when Cre expression was driven by a tissue-specific phaseolin promoter.

Conclusions:

• Cre recombinase expression can induce undesirable phenotypes in plants, dependent on expression timing.
• Limiting Cre recombinase expression to specific tissues and short time frames is recommended for plant genetic applications.
• The findings provide critical insights for optimizing the use of site-specific recombinases in plant biotechnology.