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Nephrotic Syndrome I : Introduction

Nephrotic Syndrome I : Introduction

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...

Glomerular Filtration

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The filtration membrane in the renal system is a highly specialized structure essential for filtering blood. It consists of glomerular capillaries and podocytes, forming a selective barrier that permits the passage of water and small solutes while restricting most plasma proteins and blood cells.
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The filtration process involves three key layers: the glomerular endothelial cells, the basement membrane, and the podocyte-formed filtration slits.

Renal Corpuscle

Renal Corpuscle

The glomerulus and Bowman's capsule are two essential components of the nephron, which is the functional unit of the kidney. These microscopic structures play a critical role in the process of blood filtration to produce urine.
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Confocal Fluorescence Microscopy

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Confocal microscopy is an advanced microscopic technique. The prime advantage of the confocal microscope over other microscopy techniques is its ability to block the out-of-focus light from the illuminated samples using pinholes. It is widely used with fluorescence optics to obtain high-resolution, sharp contrast images. Unlike optical microscopes, confocal microscopes use a focused beam of light laser to scan the entire sample surface at different z-planes. These microscopes are, therefore,...

Nephrons

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The kidneys are intricate organs with millions of working units known as nephrons. Each nephron features two major structures: the renal corpuscle, which facilitates blood plasma filtration, and the renal tubule, which handles the glomerular filtrate. Blood supply is directly linked to the nephrons. The renal corpuscle consists of the glomerulus, a capillary network, and the Bowman's capsule, a double-walled epithelial structure that encases the glomerulus. The filtering of blood plasma...

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Updated: Jan 10, 2026

Nephrotic Syndrome I : Introduction

Nephrotic Syndrome I : Introduction

Published on: June 19, 2025

Aneuploidy Causes Non-genetic Individuality.

Rebecca R Beach¹, Chiara Ricci-Tam², Christopher M Brennan¹

¹David H. Koch Institute for Integrative Cancer Research, Howard Hughes Medical Institute, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

|April 8, 2017

Summary

Aneuploidy, or chromosome number variations, causes non-genetic variability in cell behavior and disease presentation. This variability increases with the degree of aneuploidy and impacts treatment responses.

Keywords:

Down syndrome aneuploidy biological noise cancer cell-to-cell variability gene dosage effects non-genetic heterogeneity

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Glomerular Filtration

Glomerular Filtration

Renal Corpuscle

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Last Updated: Jan 10, 2026

Nephrotic Syndrome I : Introduction

Nephrotic Syndrome I : Introduction

Published on: June 19, 2025

Glomerular Filtration

Glomerular Filtration

Renal Corpuscle

Renal Corpuscle

Area of Science:

Genetics and Molecular Biology
Cellular Biology
Disease Pathophysiology

Background:

Phenotypic variability is common in diseases with chromosome gains/losses (e.g., Down syndrome, cancer).
Allelic variations were previously considered the primary driver of this heterogeneity.

Purpose of the Study:

To investigate if aneuploidy itself, independent of allelic changes, induces non-genetic phenotypic variability.
To determine the relationship between the degree of aneuploidy and the extent of variability.

Main Methods:

Systematic examination of yeast cell populations with defined aneuploidies.
Analysis of cell-cycle progression and response to environmental perturbations.
Inbred trisomic mouse models were used for cross-species validation.

Main Results:

Aneuploid yeast cell populations displayed significant heterogeneity in cell-cycle progression and environmental response.
Variability in phenotype increased with the degree of aneuploidy.
Gene copy number imbalances were identified as a partial cause, affecting gene expression and network robustness.

Conclusions:

The aneuploid state is a direct cause of non-genetic phenotypic variability.
This non-genetic individuality is a universal characteristic of aneuploidy, potentially explaining variable disease presentation and treatment responses.