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Alternative promoter usage during organ development.

Jiang Tan1,2,3, Yidan Sun1,2,3

  • 1Department of Genetics, Washington University School of Medicine, St. Louis, Missouri, United States of America.

Plos Genetics
|March 28, 2025
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Summary
This summary is machine-generated.

Alternative promoters drive organ development and function by enabling unique gene expression patterns. This study reveals their critical, often overlooked, role in shaping organ identity during mammalian development.

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Area of Science:

  • Developmental Biology
  • Genomics
  • Molecular Biology

Background:

  • Dynamic gene expression is essential for mammalian organ development and function.
  • Many genes utilize multiple promoters, but the role of alternative promoters in organogenesis is poorly understood.

Purpose of the Study:

  • To investigate the role of alternative promoters in mammalian organ development.
  • To identify and characterize developmentally dynamic promoters (DDPs) across various organs and developmental stages.

Main Methods:

  • RNA-sequencing (RNA-seq) data from 313 mouse samples across different developmental stages and seven major organs were analyzed.
  • Identification of active promoters, distinguishing between major and alternative promoters.
  • Analysis of the regulation and functional impact of alternative promoter usage.

Main Results:

  • Between 967 and 3,237 developmentally dynamic promoters (DDPs) were identified per organ.
  • Both major and alternative promoters were found to be developmentally dynamic.
  • Alternative promoters can be independently regulated and are crucial for organ-specific functions and gene expression.
  • Increased alternative promoter usage significantly impacts organ identity and function.

Conclusions:

  • Alternative promoter usage is a critical, yet often overlooked, mechanism in mammalian organ development.
  • These findings provide new insights into the regulatory complexity of organogenesis and the functional significance of promoter diversity.