Related Experiment Video
Updated: Jun 23, 2026
10:38
Monitoring Cell-autonomous Circadian Clock Rhythms of Gene Expression Using Luciferase Bioluminescence Reporters
Published on: September 27, 2012
miRNA-regulated dynamics in circadian oscillator models
Amitabha Nandi1, Candida Vaz, Alok Bhattacharya
1Center for Computational Biology and Bioinformatics, School of Information Technology, Jawaharlal Nehru University, New Delhi 110067, India. writeamitabha@gmail.com
BMC Systems Biology
|May 6, 2009
Summary
MicroRNAs (miRNAs) significantly impact gene expression dynamics by altering oscillation frequency and amplitude in biological regulatory systems. This study reveals their crucial role in controlling protein production timing and levels.
Area of Science:
- Molecular Biology
- Systems Biology
- Genetics
Background:
- MicroRNAs (miRNAs) are small RNA molecules regulating gene expression post-transcriptionally.
- Their precise role in the dynamics of regulatory networks, particularly circadian oscillators, remains incompletely understood.
- miRNAs typically reduce protein production by mRNA degradation or translation blocking, but can occasionally up-regulate gene expression.
Purpose of the Study:
- To investigate the influence of microRNA (miRNA) regulation on the dynamics of gene expression in circadian oscillator models.
- To understand how miRNAs affect the amplitude and frequency of oscillations in biological regulatory systems.
Main Methods:
- Utilized two models of circadian oscillators.
- Incorporated miRNA-mediated gene regulation into these models.
- Employed standard stochastic simulation techniques to analyze system dynamics.
Main Results:
- Inclusion of miRNAs reduced the amplitude of oscillations in gene expression.
- MicroRNA regulation altered the frequency of oscillations.
- These changes collectively modified the dynamics of protein production.
Conclusions:
- MicroRNAs profoundly affect regulatory module dynamics by controlling expression levels (amplitude) and temporal sequence (frequency).
- These findings are applicable to diverse regulatory systems beyond the specific models studied.
- miRNA dynamics are critical for understanding gene production timing and overall biological regulation.
Related Concept Videos
02:19Circadian Rhythms and Gene Regulation
The biological clock is involved in many aspects of regulating complex physiology in all animals. It was in 1935 when German zoologists, Hans Kalmus and Erwin Bünning, discovered the existence of circadian rhythm in Drosophila melanogaster. However, the internal molecular mechanisms behind the circadian clock remained a mystery until 1984, when Jeffrey C. Hall, Michael Rosbash, and Michael W. Young discovered the expression of the Per gene oscillating over a 24-hour cycle. In subsequent years,...
02:19Circadian Rhythms and Gene Regulation
The biological clock is involved in many aspects of regulating complex physiology in all animals. It was in 1935 when German zoologists, Hans Kalmus and Erwin Bünning, discovered the existence of circadian rhythm in Drosophila melanogaster. However, the internal molecular mechanisms behind the circadian clock remained a mystery until 1984, when Jeffrey C. Hall, Michael Rosbash, and Michael W. Young discovered the expression of the Per gene oscillating over a 24-hour cycle. In subsequent years,...
02:45Biological Clocks and Seasonal Responses
The circadian—or biological—clock is an intrinsic, timekeeping, molecular mechanism that allows plants to coordinate physiological activities over 24-hour cycles called circadian rhythms. Photoperiodism is a collective term for the biological responses of plants to variations in the relative lengths of dark and light periods. The period of light-exposure is called the photoperiod.
01:15Chronopharmacokinetics: Circadian Rhythms and Influence on Drug Response
Circadian rhythms are cyclic changes that are crucial in plasma drug concentrations. Various standard circadian parameters, including core body temperature, heart rate, and other cardiovascular factors, directly impact disease states and the therapeutic response to drug therapy.
The time of drug administration is an important factor to consider, as it can influence the toxic dose of a drug. For example, a study conducted by Prins et al. in 1997 examined the effects of the timing of...
The time of drug administration is an important factor to consider, as it can influence the toxic dose of a drug. For example, a study conducted by Prins et al. in 1997 examined the effects of the timing of...
01:30RLC Circuit as a Damped Oscillator
An RLC circuit combines a resistor, inductor, and capacitor, connected in a series or parallel combination.
Consider a series RLC circuit. Here, the presence of resistance in the circuit leads to energy loss due to joule heating in the resistance. Therefore, the total electromagnetic energy in the circuit is no longer constant and decreases with time. Since the magnitude of charge, current, and potential difference continuously decreases, their oscillations are said to be damped. This is...
Consider a series RLC circuit. Here, the presence of resistance in the circuit leads to energy loss due to joule heating in the resistance. Therefore, the total electromagnetic energy in the circuit is no longer constant and decreases with time. Since the magnitude of charge, current, and potential difference continuously decreases, their oscillations are said to be damped. This is...
01:45Positive Regulator Molecules
To consistently produce healthy cells, the cell cycle—the process that generates daughter cells—must be precisely regulated.