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Genome-wide Association Studies-GWAS01:11

Genome-wide Association Studies-GWAS

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Genome-wide association studies or GWAS are used to identify whether common SNPs are associated with certain diseases. Suppose specific SNPs are more frequently observed in individuals with a particular disease than those without the disease. In that case, those SNPs are said to be associated with the disease. Chi-square analysis is performed to check the probability of the allele likely to be associated with the disease.
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Chronic Kidney Disease I: Introduction01:25

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Chronic Kidney Disease (CKD) arises when the kidneys progressively lose their ability to function, ultimately leading to end-stage kidney disease (ESKD). At this advanced stage, the kidneys can no longer filter waste or maintain essential body functions, requiring renal replacement therapy (RRT) through dialysis or a kidney transplant for survival.Early-stage chronic kidney disease and detection challengesIn CKD's early stages, symptoms often remain absent because healthy nephrons compensate...
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Acute Kidney Injury IV: Diagnostic Studies and Prevention01:30

Acute Kidney Injury IV: Diagnostic Studies and Prevention

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Accurate diagnosis and effective prevention are critical in managing Acute Kidney Injury (AKI), which is linked to high mortality rates ranging from 10% to 80%. Timely recognition of at-risk patients and careful monitoring can significantly reduce the likelihood of kidney damage.Diagnostic Assessments:The diagnostic process starts with a comprehensive medical history to identify prerenal, intrarenal, and postrenal causes.Prerenal causes, such as dehydration, hypotension, or blood loss, should...
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Acute Kidney Injury II: Pathophysiology01:29

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Acute kidney injury (AKI) causes are categorized into three primary categories based on the location of the injury: prerenal, intrarenal (or intrinsic), and postrenal causes. This classification guides clinical management and illustrates how different pathways can impair kidney function.Etiology and Pathophysiology of Acute Kidney Injury1. Prerenal causesEtiology: Prerenal Acute Kidney Injury, the most common type, occurs when reduced blood flow to the kidneys decreases filtration capacity...
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External Anatomy of the Kidney01:21

External Anatomy of the Kidney

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The kidneys are a pair of bean-shaped organs in the human body that play a critical role in maintaining overall health. They filter out waste products from the blood, regulate blood pressure, maintain electrolyte balance, and stimulate the production of red blood cells.
The kidneys are located in the retroperitoneal space on either side of the vertebral column, protected posteriorly by the 11th and 12th ribs. The right kidney sits slightly lower than the left owing to the presence of the liver...
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Nephrons01:10

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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Transcriptome- and proteome-wide association studies nominate determinants of kidney function and damage.

Pascal Schlosser1, Jingning Zhang2, Hongbo Liu3

  • 1Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA. pschlos3@jhu.edu.

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|June 26, 2023
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Summary

Integrating multi-omics data reveals key genes and proteins influencing kidney function and disease. This study identifies causal determinants for kidney filtration and damage, paving the way for future research.

Keywords:
ACRBUNChronic kidney diseaseEnd-stage kidney diseaseGWASGeneticsNephrologyPWASProteomicsTWASTranscriptomicseGFR

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Area of Science:

  • Genomics
  • Proteomics
  • Nephrology
  • Systems Biology

Background:

  • Pathophysiology of kidney disease remains incompletely understood.
  • Genome-wide association studies (GWAS) are crucial for identifying genetic risk factors.
  • Multi-omics integration offers a powerful approach to uncover causal mechanisms in complex diseases.

Purpose of the Study:

  • To identify causal genes and proteins influencing kidney function and damage.
  • To integrate genome-wide genetic, transcriptomic, and proteomic data.
  • To nominate novel therapeutic targets for kidney disease.

Main Methods:

  • Conducted transcriptome-wide association studies (TWAS) in multiple tissues (kidney cortex, tubule, liver, whole blood).
  • Performed proteome-wide association studies (PWAS) in plasma.
  • Utilized colocalization analyses to prioritize genomic regions and identify causal variants.

Main Results:

  • Identified 1561 putatively causal associations across 260 genomic regions.
  • Prioritized 153 genomic regions through colocalization analyses.
  • Discovered tissue-specific gene expression (e.g., tubule expression of NRBP1) and independent associations within genomic regions (e.g., INHBC, SPRYD4).
  • Found prognostic value of INHBC for kidney disease progression.

Conclusions:

  • Multi-omics GWAS provide a catalog of causal genes and proteins for kidney function and damage.
  • Findings guide future research in kidney physiology, basic science, and clinical medicine.
  • The study highlights the potential of integrating diverse molecular data for understanding kidney disease.