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The kidneys are two large bean-shaped organs located in the upper abdomen. They filter the blood several times a day to remove toxins and rebalance water and electrolytes of the circulatory system via the renal veins. The kidneys receive blood directly from the heart via the renal arteries. These arteries enter the kidney at the hilum, the concave surface of the bean, where they branch and divide into smaller vessels and capillaries.
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Base complementarity between the three base pairs of mRNA codon and the tRNA anticodon is not a failsafe mechanism. Inaccuracies can range from a single mismatch to no correct base pairing at all. The free energy difference between the correct and nearly correct base pairs can be as small as 3 kcal/ mol. With complementarity being the only proofreading step, the estimated error frequency would be one wrong amino acid in every 100 amino acids incorporated. However, error frequencies observed in...
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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.
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Related Experiment Video

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Better Being Single? Omics Improves Kidney Organoids.

Benjamin S Freedman1

  • 1Division of Nephrology, Department of Medicine, Kidney Research Institute, Institute for Stem Cell and Regenerative Medicine, and Department of Pathology, University of Washington School of Medicine, Seattle, Washington, USA, benof@uw.edu.

Nephron
|December 17, 2018
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Summary

Comparing kidney organoid differentiation protocols reveals commonalities and limitations. New methods improve organoid purity by reducing non-kidney cell contamination, enhancing their potential for regenerative medicine applications.

Keywords:
Drop-seqKidneyOrganoidsPluripotent stem cellsPodocytesReproducibilityTranscriptomicsscRNA-seq

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Area of Science:

  • Stem cell biology
  • Developmental biology
  • Regenerative medicine

Background:

  • Human kidney organoids mimic nephron arrays but derivation methods vary.
  • The cellular composition and purity of organoids from different protocols remain unclear.

Purpose of the Study:

  • To comparatively analyze two kidney organoid differentiation protocols.
  • To identify strategies for improving organoid purity and functionality.

Main Methods:

  • Single-cell RNA sequencing (scRNA-seq) was employed for detailed cellular profiling.
  • Comparative analysis of existing protocols and development of an improved protocol.

Main Results:

  • Both analyzed protocols yielded similar organoid compositions, lacking ureteric lineages.
  • Organoids contained significant non-kidney cell contaminants, including neuronal and muscle cells.
  • A refined protocol reduced non-kidney cell types without compromising organoid epithelial cells.

Conclusions:

  • Kidney organoid platforms share more similarities than differences.
  • scRNA-seq is crucial for assessing organoid quality and guiding protocol optimization.
  • Strategies exist to enhance the purity and functional potential of kidney organoids.