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Updated: Aug 13, 2026

Analysis of Cell Cycle Position in Mammalian Cells
12:19

Analysis of Cell Cycle Position in Mammalian Cells

Published on: January 21, 2012

Characterization of the murine cyclin-dependent kinase inhibitor gene p27Kip1

T K Kwon1, J E Nagel, M A Buchholz

  • 1Clinical Immunology Section, National Institute on Aging, National Institutes of Health, Baltimore, MD 21224-2780, USA.

Gene
|November 21, 1996
PubMed

Insights

The cyclin-dependent kinase inhibitor p27Kip1 regulates cell division. Its gene promoter has unique features, including transcription factor binding sites, influencing its expression in T-cells.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • p27Kip1 is a key inhibitor of cyclin-dependent kinases (CDKs), crucial for cell-cycle progression.
  • p27Kip1 expression is dynamic, peaking in resting T-cells and decreasing upon activation.

Purpose of the Study:

  • To clone the murine p27Kip1 gene.
  • To functionally analyze the promoter region of the p27Kip1 gene.
  • To identify regulatory elements controlling p27Kip1 gene expression.

Main Methods:

  • Gene cloning from murine genomic DNA.
  • Primer extension and nuclease S1 protection assays to identify transcription start sites.
  • Characterization of the 5'-flanking region (-1609 to +178) to identify regulatory elements.

Main Results:

  • The p27Kip1 gene spans over 5.6 kb and contains at least three exons.
  • Two major transcription initiation sites were identified.
  • The promoter lacks a TATA box but contains binding sites for Sp1, CRE, Myb, and NFkB.
  • A positive regulatory region was identified between nucleotides -326 and -615.

Conclusions:

  • The p27Kip1 gene promoter has a complex structure with multiple potential regulatory elements.
  • Specific regions within the promoter, particularly -326 to -615, are critical for regulating p27Kip1 gene expression.
  • Understanding these regulatory mechanisms provides insight into cell-cycle control in T-cells.

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