Related Experiment Video
Updated: May 1, 2026

07:51
High Throughput Microfluidic Rapid and Low Cost Prototyping Packaging Methods
Published on: December 23, 2013
7.1K
Rethinking the microprocessor.
Hervé Seitz1, Phillip D Zamore
1Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Worcester, MA 01532, USA.
Cell
|June 6, 2006
Summary
MicroRNAs (miRNAs) are gene expression regulators processed from primary transcripts. Structural features of these transcripts ensure precise processing by the Drosha-DGCR8 enzyme complex for functional miRNA production.
Area of Science:
- Molecular Biology
- Genetics
- Biochemistry
Background:
- MicroRNAs (miRNAs) are small non-coding RNA molecules that play crucial roles in post-transcriptional gene regulation.
- miRNAs are processed from longer primary miRNA (pri-miRNA) transcripts through a series of steps involving specific enzymes.
- Understanding the mechanisms governing accurate miRNA biogenesis is essential for comprehending gene expression control.
Discussion:
- The Drosha-DGCR8 enzyme complex is central to the initial processing of pri-miRNAs in the nucleus.
- Specific structural elements within the pri-miRNA transcript dictate the precise cleavage site for Drosha-DGCR8.
- These structural features ensure the generation of the correct precursor miRNA (pre-miRNA) hairpin, which is vital for downstream processing.
Key Insights:
- Han et al. (2006) identified key structural determinants in pri-miRNA transcripts that guide the Drosha-DGCR8 complex.
- These determinants ensure the fidelity of the initial miRNA processing step, preventing the production of aberrant miRNA precursors.
- Precise recognition and cleavage by Drosha-DGCR8 are critical for producing mature, functional miRNAs.
Outlook:
- Further investigation into pri-miRNA structural motifs can reveal novel regulatory mechanisms in miRNA biogenesis.
- Understanding these structural features may lead to therapeutic strategies targeting miRNA-related diseases.
- Elucidating the precise interactions between pri-miRNA structures and processing enzymes provides a deeper insight into gene regulation.
Related Concept Videos
Woodward–Hoffmann Selection Rules and Microscopic Reversibility
2.2K
Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
2.2K
Introduction to Nuclear Reprogramming
1.3K
Nuclear reprogramming is the process of switching gene expression of one cell type to that of another cell type, usually from a differentiated cell state to an undifferentiated cell state. Differentiation occurs during processes such as development and morphogenesis, tissue regeneration, and malignancy. Cells can also be artificially induced to reprogram their gene expression by techniques such as nuclear transfer, induced pluripotency, and cell fusion. Such techniques have many applications in...
1.3K
Ampere-Maxwell's Law: Problem-Solving
1.4K
A parallel-plate capacitor with capacitance C, whose plates have area A and separation distance d, is connected to a resistor R and a battery of voltage V. The current starts to flow at t = 0. What is the displacement current between the capacitor plates at time t? From the properties of the capacitor, what is the corresponding real current?
To solve the problem, we can use the equations from the analysis of an RC circuit and Maxwell's version of Ampère's law.
For the first part of the...
To solve the problem, we can use the equations from the analysis of an RC circuit and Maxwell's version of Ampère's law.
For the first part of the...
1.4K
Machines
1.2K
Machines are complex structures consisting of movable, pin-connected multi-force members that work together to transmit forces. One example of a machine is the cutting plier, which is used to cut wires by applying forces to its handles. When equal and opposite forces are exerted on the handles of the cutting plier, they cause the cutting edges to come together and apply equal and opposite reaction forces on the wire, which are greater than the applied forces.
A free-body diagram of the...
A free-body diagram of the...
1.2K
Machines: Problem Solving II
791
Machines are complex structures consisting of movable, pin-connected multi-force members that work together to transmit forces. Consider a lifting tong carrying a 100 kg load. It comprises movable sections DAF and CBG linked together with member AB.
791
Semiconductors
1.8K
There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
1.8K

