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GPI-anchoring is a post-translational, reversible protein modification that is ubiquitous in eukaryotes. Such proteins are primarily present on the exoplasmic leaflet of the plasma membrane.
GPI-anchor structure
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In order to make good decisions, we use our knowledge and our reasoning. Often, this knowledge and reasoning is sound and solid. However, sometimes, we are swayed by biases or by others manipulating a situation. For example, let’s say you and three friends wanted to rent a house and had a combined target budget of $1,600. The realtor shows you only very run-down houses for $1,600 and then shows you a very nice house for $2,000. Might you ask each person to pay more in rent to get the...
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Anchoring junctions are multiprotein complexes that help cells connect to other cells and the extracellular matrix. Anchoring junctions are present on the lateral and basal surfaces of cells, providing strong and flexible connections. Focal adhesions are often formed due to cell interactions with the ECM substrata, which initiate signal transduction via kinase cascades and other mechanisms. Together, they provide stability and tissue integrity. There are three types of anchoring junctions:...
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In the plasma membrane, the lipids forming the bilayer can also act as an anchor to tether proteins to the membrane. The three main types of lipid anchors found in eukaryotes are – prenyl groups, fatty acyl groups, and glycosylphosphatidylinositol or GPI groups. Prenyl and fatty acyl groups act as anchors on the cytosolic surface of the membrane, whereas GPI anchors proteins on the extracellular side.
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Related Experiment Video

Updated: Feb 8, 2026

GPI Anchoring of Proteins in the ER Membrane
01:29

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Patchy enteropathy in childhood.

P D Manuel, J A Walker-Smith, N E France

    Gut
    |March 1, 1979
    PubMed
    Summary
    This summary is machine-generated.

    Patchy duodenal mucosal lesions are common in children, especially with cow's milk enteropathy. Dissecting microscopy and double port capsules improve detection of these subtle gastrointestinal findings.

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    Area of Science:

    • Pediatric Gastroenterology
    • Gastrointestinal Pathology

    Background:

    • Patchy mucosal lesions in the duodenum can be challenging to detect.
    • Understanding the incidence and causes of these lesions is crucial for accurate diagnosis in children.

    Purpose of the Study:

    • To determine the incidence of patchy mucosal lesions in pediatric duodenal biopsies.
    • To evaluate the diagnostic utility of dissecting microscopy and different capsule types in identifying these lesions.

    Main Methods:

    • Consecutive duodenal biopsy specimens (n=278) from children were analyzed using histology and dissecting microscopy.
    • Comparison of single port and double port Crosby capsule techniques for specimen acquisition.
    • Correlation of gross appearance with histological findings.

    Main Results:

    • 49 out of 106 abnormal specimens (37%) exhibited patchy lesions.
    • Patchy lesions were most frequent in cow's milk sensitive enteropathy (66%).
    • Double port capsules (22%) yielded more patchy lesions than single port (10%), a significant difference (P=0.01).
    • Dissecting microscopy identified 37% of patchy lesions missed by histology alone.

    Conclusions:

    • Patchy duodenal lesions are prevalent in children, particularly those with cow's milk protein intolerance and postenteritis syndrome.
    • Dissecting microscopy and double port capsules enhance the detection of patchy mucosal abnormalities.
    • These findings underscore the importance of thorough examination for subtle lesions in pediatric duodenal biopsies.