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Related Concept Videos

In-vitro Mutagenesis01:16

In-vitro Mutagenesis

To learn more about the function of a gene, researchers can observe what happens when the gene is inactivated or “knocked out,” by creating genetically engineered knockout animals. Knockout mice have been particularly useful as models for human diseases such as cancer, Parkinson’s disease, and diabetes.
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At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category, whereas...

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Conditional gene knockout system in cone photoreceptors.

Yun-Zheng Le1, John D Ash, Muayyad R Al-Ubaidi

  • 1Department of Cell Biology, University of Oklahoma Health Sciences Center, USA.

Advances in Experimental Medicine and Biology
|January 26, 2007
PubMed
Summary

Researchers developed a new conditional knockout system for cone photoreceptor cells. This system efficiently disrupts gene function in M- and S-cone photoreceptors without affecting other tissues.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Neuroscience

Background:

  • Studying essential genes in specific cell types is crucial for understanding biological functions.
  • Cone photoreceptors are vital for color vision, and their genetic manipulation presents unique challenges.
  • Existing genetic tools may lack specificity or efficiency for targeting cone photoreceptors.

Purpose of the Study:

  • To establish a conditional knockout system for cone photoreceptor cells.
  • To create an efficient genetic tool for disrupting gene function specifically within cone photoreceptors.
  • To enable the study of widely expressed essential genes in cone photoreceptor biology.

Main Methods:

  • Development of a transgenic mouse line (HRGP-cre) expressing Cre recombinase.
  • Utilizing a Cre-activatable lacZ reporter gene for functional assessment of Cre activity.
  • Assessing Cre expression patterns and specificity in cone photoreceptors.

Main Results:

  • The HRGP-cre mouse line demonstrated widely expressed and functional Cre recombinase activity in cone photoreceptors.
  • Nearly all cone photoreceptor cells (both M- and S-cones) express Cre, ensuring efficient gene manipulation.
  • No significant ectopic Cre expression was observed in non-ocular tissues, indicating high specificity.

Conclusions:

  • The established HRGP-cre mouse line provides an efficient and specific tool for conditional gene knockout in cone photoreceptors.
  • This system facilitates the study of essential gene functions within cone photoreceptors, advancing our understanding of vision.
  • The lack of ectopic expression minimizes confounding effects, allowing for reliable investigation of gene roles in ocular tissues.