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Target-directed microRNA degradation regulates developmental microRNA expression and embryonic growth in mammals.

Benjamin T Jones1, Jaeil Han1, He Zhang2

  • 1Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, Texas 75390, USA.

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Summary

Target-directed miRNA degradation (TDMD) controls microRNA (miRNA) levels. Loss of Zswim8, a key TDMD factor, caused developmental defects and revealed widespread miRNA regulation by TDMD in mammals.

Keywords:
TDMDZSWIM8embryonic growthmiRNAsmicroRNAstarget-directed microRNA degradation

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Area of Science:

  • Molecular Biology
  • Genetics
  • Developmental Biology

Background:

  • MicroRNAs (miRNAs) are crucial gene regulators in development and disease.
  • Target-directed miRNA degradation (TDMD) is a mechanism for controlling miRNA levels, but its role in mammals is unclear.

Purpose of the Study:

  • To investigate the biological role and scope of miRNA regulation by TDMD in mammals.
  • To characterize the function of Zswim8, an essential TDMD factor.

Main Methods:

  • Generated mice with constitutive or conditional deletion of the Zswim8 gene.
  • Utilized small RNA sequencing on embryonic tissues.
  • Analyzed miRNA regulation, including cotranscribed clusters and arm switching.

Main Results:

  • Loss of Zswim8 led to severe developmental defects, growth restriction, and perinatal lethality.
  • Small RNA sequencing revealed widespread TDMD regulation of miRNAs, expanding the known catalog.
  • Identified novel features of TDMD-regulated miRNAs, such as enrichment in clusters and involvement in arm switching.
  • Deletion of miR-322 and miR-503 rescued growth defects in Zswim8-null embryos.

Conclusions:

  • TDMD is a broad regulatory mechanism impacting mammalian development.
  • Zswim8 is essential for normal development, and its loss disrupts miRNA homeostasis.
  • The TDMD pathway, through specific miRNAs, regulates mammalian body size.