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Related Concept Videos

Crossing over01:34

Crossing over

Unlike mitosis, meiosis aims for genetic diversity in its creation of haploid gametes. Dividing germ cells first begin this process in prophase I, where each chromosome—replicated in S phase—is now composed of two sister chromatids (identical copies) joined centrally.
The homologous pairs of sister chromosomes—one from the maternal and one from the paternal genome—then begin to align alongside each other lengthwise, matching corresponding DNA positions in a process called synapsis.
In order to...
Crossing Over01:30

Crossing Over

Crossing over is the exchange of genetic information between homologous chromosomes during prophase I of meiosis I. Genetic recombination gives rise to allelic diversity in the newly formed daughter cells. In humans, crossing over produces genetically distinct haploid egg and sperm cells that undergo fertilization to produce unique offspring. Before cell division starts, the germ cell’s chromosome(s) undergo duplication in the S phase of the cell cycle. As the cells enter prophase I, duplicated...
Crossing Over01:34

Crossing Over

Unlike mitosis, meiosis aims for genetic diversity in its creation of haploid gametes. Dividing germ cells first begin this process in prophase I, where each chromosome—replicated in S phase—is now composed of two sister chromatids (identical copies) joined centrally.
The homologous pairs of sister chromosomes—one from the maternal and one from the paternal genome—then begin to align alongside each other lengthwise, matching corresponding DNA positions in a process called synapsis.
In order to...
Rolling Resistance01:21

Rolling Resistance

When a solid cylinder rolls steadily on a rigid surface, the normal force applied by the surface on the cylinder is perpendicular to the tangent at the contact point. However, since no materials are entirely rigid, the surface's reaction to the cylinder involves a range of normal pressures.
For instance, imagine a hard cylinder rolling on a comparatively soft surface. The cylinder's weight compresses the surface beneath it. As the cylinder moves, the material in front of it slows down due to...
Resistance01:19

Resistance

When a current moves through any conductor, the conductor causes some level of difficulty for the current to flow. The measure of that difficulty is known as the resistance of the material and is represented by R. Every material has its own resistance. In the case of conductors, heat is emitted whenever a current passes through them. Resistance depends on the resistivity of the material. Resistivity is a characteristic of the material used to fabricate electrical components, whereas the...
Rolling With Slipping01:14

Rolling With Slipping

Rolling with slipping is a physical phenomenon that occurs when a rolling object experiences both rotational and linear motion but also experiences frictional forces that cause slipping. This phenomenon can occur in various situations, such as when a tire rolls on a wet road or a ball rolls on a rough surface.
An object's rolling motion is characterized by its rotation around its axis, while linear motion refers to the object's translational motion along a surface. Frictional forces can affect...

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Related Experiment Video

Updated: Jul 7, 2026

Direct Restart of a Replication Fork Stalled by a Head-On RNA Polymerase
07:27

Direct Restart of a Replication Fork Stalled by a Head-On RNA Polymerase

Published on: April 29, 2010

A survivor hits the breaks.

Douglas R Green1, Peter J McKinnon

  • 1Department of Immunology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA. douglas.green@stjude.org

Molecular Cell
|March 4, 2008
PubMed
Summary

The Bcl2 protein, known for regulating apoptosis, also inhibits DNA repair pathways. This study reveals a novel role for Bcl2 in controlling nonhomologous end-joining, a critical DNA repair mechanism.

Area of Science:

  • Molecular Biology
  • Cellular Biology
  • Genetics

Background:

  • Bcl2 is a key regulator of apoptosis, controlling mitochondrial outer membrane permeability.
  • The Bcl2 protein family plays crucial roles in cell survival and death pathways.

Discussion:

  • This research explores a newly identified function of Bcl2 beyond its canonical role in apoptosis.
  • The study investigates the interaction between Bcl2 and DNA repair mechanisms, specifically nonhomologous end-joining (NHEJ).

Key Insights:

  • Bcl2 actively inhibits the nonhomologous end-joining (NHEJ) DNA repair pathway.
  • This finding suggests a dual role for Bcl2 in both programmed cell death and DNA damage response.

Outlook:

  • Further research is needed to elucidate the precise molecular mechanisms of Bcl2-mediated NHEJ inhibition.

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  • Understanding this novel function could have implications for cancer therapy and understanding genomic stability.