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Nephrotic Syndrome is a chronic kidney disorder defined by clinical findings such as severe proteinuria, hypoalbuminemia, hyperlipidemia, and edema. These symptoms result from damage to the glomeruli, the kidney’s filtering units, increasing their permeability to proteins.Definition and Meaning:Proteinuria, defined as the loss of more than 3.5 grams of protein per day in adults, is a crucial feature of nephrotic syndrome. This condition is often accompanied by edema, the accumulation of...
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Related Experiment Video

Updated: Jan 10, 2026

Nephrotic Syndrome I : Introduction
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Published on: June 19, 2025

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Inverted repeat sequences in the Drosophila genome

C W Schmid, J E Manning, N Davidson

    Cell
    |June 1, 1975
    PubMed
    Summary
    This summary is machine-generated.

    Drosophila melanogaster inverted repeats exhibit diverse duplex lengths and unique, long spacer regions, differing from other organisms. These sequences comprise a significant portion of the genome, containing middle repetitive DNA.

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    Area of Science:

    • Molecular Biology
    • Genomics
    • Drosophila melanogaster research

    Background:

    • Inverted repeat (foldback) sequences are a feature of eukaryotic DNA.
    • Understanding their structure and distribution is key to genome organization.
    • Previous studies on inverted repeats in most organisms show short spacers.

    Purpose of the Study:

    • To characterize the properties of inverted repeat sequences in Drosophila melanogaster DNA.
    • To investigate the lengths of duplex regions and spacer sequences.
    • To compare Drosophila inverted repeat organization with other studied organisms.

    Main Methods:

    • Hybridization Assay Chromatography (HAP) to analyze DNA reassociation.
    • Electron Microscopy (EM) to visualize DNA structures.
    • Kinetic analysis and enzyme digestion (Mung Bean Endonuclease I).

    Main Results:

    • Drosophila inverted repeats show a wide distribution of duplex lengths (0.1 to >15 kb).
    • 80% of inverted repeats have measurable spacers (0.5 to >30 kb), averaging 2.7 kb (number) and 6.1 kb (weight).
    • Average center-to-center spacing is estimated at 40-80 kb, with enzyme-resistant duplexes comprising ~3% of the genome.

    Conclusions:

    • The Drosophila genome possesses unusually long spacer regions between inverted repeats, distinguishing it from other organisms.
    • Inverted repeats, including their spacers and flanking sequences, contain all frequency components of the Drosophila genome.
    • Approximately 2000-4000 inverted repeat pairs are estimated to exist in the Drosophila genome.