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Related Concept Videos

Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

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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,...
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Phosphoinositides and PIPs01:42

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Phosphoinositides are a group of phospholipids containing a glycerol backbone with two fatty acid chains and a phosphate attached to a myoinositol sugar ring. The inositol head group extends into the cytoplasm, where it is modified by adding phosphate groups to form phosphatidylinositol phosphates or PIPs.
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Protein Transport to the Outer Chloroplast Membrane01:11

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Chloroplast outer membrane proteins encoded by the nucleus are synthesized in the cytosol. Soon after synthesis, they bind cytosolic factors such as 14-3-3 protein and the Hsp70 chaperones that keep these precursors in an unfolded state until their translocation.
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Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)01:15

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Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
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Proteins targeted to the inner chloroplast membrane, or plastid proteins, are transported by two general pathways: the stop-transfer and the re-insertion or post-import pathways. Most plastid proteins carry N-terminal transit sequences and internal import sequences targeting it to the specific chloroplast subcompartment. Proteins targeted by the stop-transfer pathway have internal hydrophobic sequences that inhibit their translocation into the stroma. As a result, these precursors are arrested...
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Light plays a significant role in regulating the growth and development of plants. In addition to providing energy for photosynthesis, light provides other important cues to regulate a range of developmental and physiological responses in plants.
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Related Experiment Video

Updated: Jun 13, 2025

Large-Scale Purification of Porcine or Bovine Photoreceptor Outer Segments for Phagocytosis Assays on Retinal Pigment Epithelial Cells
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Inpp5e Is Critical for Photoreceptor Outer Segment Maintenance.

Mohona Gupta, Tylor R Lewis, Michael W Stuck

    Biorxiv : the Preprint Server for Biology
    |September 10, 2024
    PubMed
    Summary
    This summary is machine-generated.

    Inositol polyphosphate-5-phosphatase e (INPP5E) is crucial for photoreceptor health. Its loss causes severe outer segment defects and cell death, leading to blindness.

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    Two Peeling Methods for the Isolation of Photoreceptor Cell Compartments in the Mouse Retina for Protein Analysis
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    Two Peeling Methods for the Isolation of Photoreceptor Cell Compartments in the Mouse Retina for Protein Analysis
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    Two Peeling Methods for the Isolation of Photoreceptor Cell Compartments in the Mouse Retina for Protein Analysis

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    Area of Science:

    • Ophthalmology
    • Cell Biology
    • Genetics

    Background:

    • Mutations in inositol polyphosphate-5-phosphatase e (INPP5E) are linked to human retinal degeneration, including Joubert and MORM syndromes and non-syndromic blindness.
    • In mouse models, INPP5E deficiency results in various anomalies and impaired photoreceptor outer segment formation.

    Purpose of the Study:

    • To investigate the specific role of Inpp5e in photoreceptor outer segment development and maintenance.
    • To elucidate the cellular mechanisms underlying Inpp5e-dependent photoreceptor integrity.

    Main Methods:

    • Generation of conditional and inducible mouse knockouts for Inpp5e in photoreceptors.
    • Analysis of photoreceptor morphology, outer segment structure, Golgi apparatus, protein localization, and actin network dynamics.
    • Assessment of extracellular vesicle formation and disc morphogenesis.

    Main Results:

    • Loss of Inpp5e in photoreceptors, regardless of timing, caused severe outer segment defects and photoreceptor cell loss.
    • Key defects included outer segment shortening, reduced new disc formation, Golgi abnormalities, rhodopsin mislocalization, and extracellular vesicle accumulation.
    • Reduced actin network and abnormal membrane whorl formation were observed in knockout cells.

    Conclusions:

    • Inpp5e is essential for maintaining photoreceptor outer segment structure and function.
    • The enzyme plays a critical role in the continuous renewal process of photoreceptor outer segments.
    • Dysfunction of Inpp5e disrupts normal disc morphogenesis and leads to photoreceptor degeneration.