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Position-effect Variegation02:32

Position-effect Variegation

In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
Exon Recombination02:32

Exon Recombination

The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes. 
Exon shuffling follows “splice frame rules.” Each exon has three reading...

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Related Experiment Video

Updated: May 7, 2026

Stereotaxic Microinjection of Viral Vectors Expressing Cre Recombinase to Study the Role of Target Genes in Cocaine Conditioned Place Preference
08:22

Stereotaxic Microinjection of Viral Vectors Expressing Cre Recombinase to Study the Role of Target Genes in Cocaine Conditioned Place Preference

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Cell Type-Specific Encoding of Cocaine-Conditioned Responses in the Lateral Preoptic Area.

Jennifer I Mejaes1,2, Rithikaa Rajendran1, Kamila Sayed1

  • 1Department of Psychology, Rutgers, The State University of New Jersey, Piscataway, New Jersey, USA.

The European Journal of Neuroscience
|March 8, 2026
PubMed
Summary
This summary is machine-generated.

Researchers studied lateral preoptic area (LPO) neurons in mice, finding distinct glutamatergic and GABAergic cell activity patterns during cocaine conditioning. These patterns correlate with drug-seeking behaviors, offering insights into LPO circuits and drug-associated learning.

Keywords:
aversioncircuitcocainehypothalamuspreopticreward

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Area of Science:

  • Neuroscience
  • Neurobiology
  • Behavioral Neuroscience

Background:

  • The lateral preoptic area (LPO) is a key hypothalamic region involved in motivated behaviors, including drug seeking.
  • Previous research indicates diverse neuronal activity in the LPO during cocaine self-administration.
  • The specific roles of glutamatergic and GABAergic neurons in cocaine-conditioned responses are not well understood.

Purpose of the Study:

  • To investigate the activity patterns of LPO glutamatergic and GABAergic neurons during cocaine conditioning.
  • To determine how these specific neuronal populations respond to drug-associated cues.
  • To link LPO neuronal activity to conditioned place preference for cocaine.

Main Methods:

  • Electrophysiological recordings of LPO vglut2-expressing (glutamatergic) and vgat-expressing (GABAergic) neurons in awake, behaving mice.
  • Cocaine conditioning paradigm to establish drug-associated cues.
  • Analysis of neuronal activity in response to entering drug-paired and saline-paired chambers.

Main Results:

  • Both LPO glutamatergic and GABAergic neurons showed decreased activity upon entering the cocaine-paired chamber post-conditioning.
  • Glutamatergic neurons exhibited increased activity when entering the saline-paired chamber.
  • Reduced GABAergic activity correlated with increased preference for the cocaine chamber, while stronger glutamatergic responses correlated with preference for the saline chamber.

Conclusions:

  • LPO glutamatergic and GABAergic neurons display distinct, cell-type-specific activity during cocaine-conditioned place preference.
  • LPO neuronal activity is linked to conditioned behaviors in a cell type- and context-dependent manner.
  • This study provides foundational evidence for the involvement of LPO circuits in drug-associated learning and conditioned responses.