Estivation-responsive microRNAs in a hypometabolic terrestrial snail

Area of Science:

• * Molecular Biology
• * Physiology
• * Environmental Science

Background:

• * The milk snail (Otala lactea) exhibits estivation, a dormancy state triggered by extreme environmental conditions.
• * Estivation involves a significant metabolic rate reduction to below 30% of normal resting levels.
• * This hypometabolic state is supported by behavioral, physiological, and molecular adaptations.

Purpose of the Study:

• * To investigate the role of microRNA (miRNA) regulation in the induction of estivation in Otala lactea.
• * To identify specific miRNAs involved in the molecular mechanisms underlying estivation.
• * To explore the conserved nature of miRNA responses in hypometabolic states across species.

Main Methods:

• * Analysis of microRNA expression levels in the foot muscle of Otala lactea.
• * Comparison of miRNA expression between estivating snails and control (active) snails.
• * Bioinformatic analysis to link differentially expressed miRNAs to cellular functions.

Main Results:

• * Expression levels of 75 conserved microRNAs were analyzed.
• * 26 microRNAs were found to be significantly upregulated during estivation compared to controls.
• * These upregulated miRNAs are associated with critical survival functions, including anti-apoptosis, cell-cycle arrest, and muscle function maintenance.

Conclusions:

• * MicroRNAs play a significant role in the regulation of estivation in the milk snail.
• * Upregulated miRNAs during estivation are crucial for enabling long-term survival in a hypometabolic state.
• * The observed miRNA responses suggest a conserved molecular mechanism for metabolic rate depression across diverse species facing environmental stress.