The phrase "trigger gene action" can be replaced by various synonyms depending on the context. Some possible alternatives include "activate genetic expression," "initiate gene function," "induce gene activity," or "stimulate genetic response." These synonyms can be useful in discussions related to gene regulation, molecular biology, or genetic engineering, among other areas. By using alternative words and phrases, scientists and researchers can more effectively communicate their ideas and findings to their colleagues and the wider public. Consistently using precise terminology and avoiding jargon can also improve clarity and scientific rigor in research and academic writing.