Intraspecific gene regulation in cis- and trans

Area of Science:

• Evolutionary biology
• Genetics
• Molecular biology

Background:

• Gene expression changes drive evolution through cis-acting (nearby) or trans-acting (distant) mutations.
• A prevailing hypothesis suggests trans-regulation dominates within-species variation, while cis-regulation explains between-species differences.

Purpose of the Study:

• To review recent studies on intraspecific gene regulation.
• To challenge the common view on the roles of cis- and trans-acting mutations in within-species gene expression variation.
• To identify potential biases in research methodologies.

Main Methods:

• Literature review of intraspecific gene regulation studies across diverse taxa.
• Analysis of existing research methodologies and their potential impact on findings.
• Examination of case studies involving cis-acting regulation in adapted populations.

Main Results:

• Many studies reveal a substantial role for cis-acting mutations in within-species gene expression variation, contradicting the prevailing hypothesis.
• Whole-organism studies, compared to tissue-specific analyses, may exhibit a bias towards identifying trans-regulation.
• Examples of predominantly cis-acting regulation are observed in recently diverged, environmentally adapted populations.

Conclusions:

• The dichotomy between cis- and trans-regulation in intra- vs. interspecific variation may be an oversimplification.
• Methodological choices, particularly the use of whole organisms versus specific tissues, can influence the perceived contribution of trans-regulation.
• Further research is needed to clarify the evolution of gene regulation, considering diverse methodologies and specific adaptive contexts.