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Related Concept Videos

Renal Tubule and Collecting Duct01:24

Renal Tubule and Collecting Duct

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The renal tubule is divided into three parts: the proximal convoluted tubule (PCT), the Loop of Henle (LOH), and the distal convoluted tubule (DCT).
Proximal Convoluted Tubule (PCT):
The PCT is the initial segment of the renal tubule, extending from the Bowman's capsule that encloses the glomerulus. Its convoluted structure and microvilli-lined cells increase the surface area for reabsorption. The PCT reabsorbs glucose, amino acids, sodium, and water from the filtrate, ensuring essential...
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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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Tubular Reabsorption and Secretion01:28

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Tubular secretion and reabsorption are two critical processes in the nephron tubule of the kidneys. When the fluid filtered from the glomerulus enters the proximal convoluted tubule, it is referred to as filtrate, and its composition changes due to tubular reabsorption and secretion.
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Once the process of glomerular filtration is completed, blood carrying unfiltered drug molecules traverses through efferent arterioles and makes its way into the peritubular capillaries in the proximal tubule. A variety of carriers play a pivotal role in actively secreting drugs from these peritubular capillaries into the tubular fluid. The organic anion transporter transfers acidic drugs, against an electrochemical gradient, from the peritubular capillaries into the renal tubule cells and...
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Renal Drug Excretion: Tubular Reabsorption01:25

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Tubular reabsorption, a process occurring post-glomerular filtration of drugs in the renal tubule, is a critical determinant of drug half-life. During the process of renal excretion, as the glomerular filtrate progresses to the distal convoluted tubule (DCT), drugs that are highly permeable, lipophilic, and nonionized undergo passive reabsorption from the tubular fluid into the surrounding peritubular capillaries. This reabsorption process restricts their elimination through the kidneys. This...
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Filtration and Urine Formation01:32

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The function of the kidneys is to filter, reabsorb, secrete, and excrete. Every day the kidneys filter nearly 180 liters of blood, initially removing water and solutes but ultimately returning nearly all filtrates into circulation with the help of osmoregulatory hormones. This process removes wastes and toxins but is also crucial to maintain water and electrolyte levels. Most of these functions are performed by the tiny but numerous nephrons contained within the kidneys.
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Variants in tubule epithelial regulatory elements mediate most heritable differences in human kidney function.

Gabriel B Loeb1,2, Pooja Kathail3, Richard Shuai3

  • 1Department of Medicine, University of California, San Francisco, San Francisco, CA, USA.

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Genetic variants influencing kidney tubule cells significantly impact kidney function heritability. This study identifies specific variants and genes, like NDRG1 and RBPMS, that may predispose individuals to kidney disease.

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Area of Science:

  • Genomics
  • Molecular Biology
  • Nephrology

Background:

  • Kidney disease heritability is high, but causal genetic factors and mechanisms are largely unknown.
  • Identifying genetic variants and their cellular functions is crucial for understanding kidney disease.
  • Previous studies lacked cell-type resolution for genetic analysis of kidney function.

Purpose of the Study:

  • To identify genetic loci associated with kidney function using genome-wide association studies (GWAS).
  • To determine the cell types and regulatory elements involved in kidney function heritability.
  • To elucidate the molecular mechanisms by which genetic variants influence kidney disease.

Main Methods:

  • Performed GWAS on kidney function biomarkers, identifying 462 loci.
  • Generated single-cell chromatin accessibility (scATAC-seq) maps of the human kidney.
  • Developed a deep learning model (ChromKid) to predict cell type-specific chromatin accessibility.

Main Results:

  • Kidney tubule epithelial and podocyte regulatory elements explained the majority of kidney function SNP-heritability.
  • Fine-mapping identified putative causal variants and their associated regulatory elements.
  • Variants alter chromatin accessibility in tubule epithelial cells, affecting NDRG1 and RBPMS gene expression.

Conclusions:

  • Genetic variants impacting kidney tubule epithelial regulatory elements are the primary drivers of kidney function heritability.
  • Inherited differences in NDRG1 and RBPMS expression may contribute to kidney disease predisposition.
  • This study establishes an experimental framework for dissecting genetic contributions to polygenic kidney diseases.