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Methods to Discover Alternative Promoter Usage and Transcriptional Regulation of Murine Bcrp1
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Tissue-selective alternate promoters guide NLRP6 expression.

Nathan A Bracey1,2, Jaye M Platnich3, Arthur Lau1,2

  • 1Department of Medicine, University of Calgary, Calgary, Canada.

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|December 30, 2020
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Summary
This summary is machine-generated.

Alternative promoters control the expression of pryin domain (PYD) genes, like NLRP6. This mechanism regulates tissue-specific protein function and immune responses by altering mRNA translation and nuclear export.

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Area of Science:

  • Molecular Biology
  • Immunology
  • Genetics

Background:

  • Pryin domain (PYD) interactions are crucial for immune-sensing complex assembly, such as inflammasomes.
  • The transcriptional regulation of PYD-containing genes is not fully understood.
  • PYD gene expression profiles dictate tissue-specific immune responses.

Purpose of the Study:

  • To investigate the transcriptional regulation mechanisms governing PYD gene family members.
  • To understand how alternative promoter utilization affects NLRP6 expression and function.
  • To elucidate the role of alternative promoters in tissue-specific silencing of PYD genes.

Main Methods:

  • Analysis of alternative promoter utilization in human and mouse NLRP6.
  • Identification of novel transcriptional promoters within the NLRP6 gene.
  • Assessment of mRNA processing, nuclear export, and translational efficiency.
  • Evaluation of Nlrp6 function in mouse disease models.

Main Results:

  • Alternative promoters regulate tissue distribution of PYD genes, including NLRP6.
  • Human NLRP6 utilizes an internal promoter in exon 2, causing truncated mRNA in non-intestinal tissues.
  • Mouse Nlrp6 employs a proximal promoter, expanding the 5' leader sequence and inhibiting translation.
  • Nlrp6 isoforms in the kidney were noncanonical and dispensable in disease models.

Conclusions:

  • Alternative promoter utilization is a key mechanism for isoform modulation and controlling PYD gene expression profiles.
  • This regulatory strategy impacts the functional output of PYD family members in a tissue-specific manner.
  • Understanding alternative promoter use is critical for deciphering immune system regulation by PYD proteins.