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Kctd15 regulates nephron segment development by repressing Tfap2a activity.

Brooke E Chambers1, Eleanor G Clark2, Allison E Gatz2

  • 1Department of Biological Sciences, Center for Stem Cells and Regenerative Medicine, Center for Zebrafish Research, University of Notre Dame, Notre Dame, IN 46556, USA rwingert@nd.edu bweaver4@nd.edu.

Development (Cambridge, England)
|October 8, 2020
PubMed
Summary
This summary is machine-generated.

KCTD15 paralogs repress Tfap2a activity to control kidney nephron segment development. Loss of KCTD15 leads to Tfap2a hyperactivity, promoting distal nephron fates and altering transporter expression.

Keywords:
Kctd15KidneyNephronSegmentationTfap2aZebrafish

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Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Renal Physiology

Background:

  • Kidney development relies on nephrons, with specific transporters defining segment functions.
  • Transcriptional control of nephron regional specification and differentiation is not fully understood.

Purpose of the Study:

  • Investigate the role of KCTD15 paralogs (kctd15a, kctd15b) in zebrafish pronephros development.
  • Elucidate the regulatory mechanisms controlling nephron segment fate and differentiation.

Main Methods:

  • Zebrafish pronephros development studies.
  • Analysis of gene expression (kctd15a, kctd15b, tfap2a, slc12a1, kcnj1a.1, stc1).
  • Gene knockdown and overexpression experiments.

Main Results:

  • KCTD15 paralogs restrict distal early/thick ascending limb segment assignment by repressing Tfap2a.
  • Loss of kctd15a/b results in Tfap2a hyperactivity, promoting distal fates and increasing specific transporter gene expression.
  • A feedback loop exists where Tfap2a promotes kctd15a/b transcription.

Conclusions:

  • A transcription factor-repressor feedback module involving Tfap2a and Kctd15 regulates nephron segment fate and differentiation.
  • Tight regulation of Tfap2a and Kctd15 kinetics is crucial for kidney development.