Cell Reports (Jul 2024)

The TSC22D, WNK, and NRBP gene families exhibit functional buffering and evolved with Metazoa for cell volume regulation

  • Yu-Xi Xiao,
  • Seon Yong Lee,
  • Magali Aguilera-Uribe,
  • Reuben Samson,
  • Aaron Au,
  • Yukti Khanna,
  • Zetao Liu,
  • Ran Cheng,
  • Kamaldeep Aulakh,
  • Jiarun Wei,
  • Adrian Granda Farias,
  • Taylor Reilly,
  • Saba Birkadze,
  • Andrea Habsid,
  • Kevin R. Brown,
  • Katherine Chan,
  • Patricia Mero,
  • Jie Qi Huang,
  • Maximilian Billmann,
  • Mahfuzur Rahman,
  • Chad Myers,
  • Brenda J. Andrews,
  • Ji-Young Youn,
  • Christopher M. Yip,
  • Daniela Rotin,
  • W. Brent Derry,
  • Julie D. Forman-Kay,
  • Alan M. Moses,
  • Iva Pritišanac,
  • Anne-Claude Gingras,
  • Jason Moffat

Journal volume & issue
Vol. 43, no. 7
p. 114417

Abstract

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Summary: The ability to sense and respond to osmotic fluctuations is critical for the maintenance of cellular integrity. We used gene co-essentiality analysis to identify an unappreciated relationship between TSC22D2, WNK1, and NRBP1 in regulating cell volume homeostasis. All of these genes have paralogs and are functionally buffered for osmo-sensing and cell volume control. Within seconds of hyperosmotic stress, TSC22D, WNK, and NRBP family members physically associate into biomolecular condensates, a process that is dependent on intrinsically disordered regions (IDRs). A close examination of these protein families across metazoans revealed that TSC22D genes evolved alongside a domain in NRBPs that specifically binds to TSC22D proteins, which we have termed NbrT (NRBP binding region with TSC22D), and this co-evolution is accompanied by rapid IDR length expansion in WNK-family kinases. Our study reveals that TSC22D, WNK, and NRBP genes evolved in metazoans to co-regulate rapid cell volume changes in response to osmolarity.

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