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Changes in gene expression in response to altered SHL transcript levels.

Carsten Müssig1, Thomas Altmann

  • 1Universität Potsdam-Genetik, c/o MPI für Molekulare Pflanzenphysiologie, Am Mühlenberg 1, 14476 Golm, Germany. muessig@mpimp-golm.mpg.de

Plant Molecular Biology
|April 15, 2004
PubMed
Summary

The nuclear SHL protein influences plant development by regulating gene expression. Over-expression of SHL in Arabidopsis (Arabidopsis thaliana) leads to earlier flowering and senescence, impacting key developmental pathways.

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Area of Science:

  • Plant Molecular Biology
  • Genetics
  • Developmental Biology

Background:

  • The SHL protein, featuring BAH and PHD domains, is involved in transcriptional regulation and chromatin modification.
  • SHL's role in plant development, particularly flowering time and senescence, is not fully understood.

Purpose of the Study:

  • To identify genes regulated by the SHL protein in Arabidopsis.
  • To elucidate the molecular mechanisms underlying the early flowering and senescence phenotypes observed in SHL over-expressing plants.

Main Methods:

  • Gene expression profiling using Affymetrix ATH1 microarrays in plants constitutively over-expressing SHL (35S::SHL).
  • Analysis of gene expression in late-flowering SHL-antisense lines.
  • Expression profiling in plants with glucocorticoid-inducible SHL over-expression.

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Main Results:

  • Over-expression of SHL altered the expression of approximately 175 genes, with 130 downregulated and 45 upregulated.
  • Upregulated genes AGL20 and AGL9 are associated with the early flowering phenotype; reduced AGL20 mRNA in antisense lines confirms SHL's regulatory role.
  • Early senescence is linked to increased expression of senescence- and defense-related genes (e.g., DIN2, DIN11, PR-1).
  • Downregulated genes include stress response genes and PSR3.2, with reduced PSR3.2 transcript levels observed in both shoots and roots.

Conclusions:

  • SHL protein plays a significant role in regulating gene expression networks controlling flowering time, senescence, and stress responses in Arabidopsis.
  • The study identified key downstream targets of SHL, including AGL20, AGL9, and PSR3.2, providing insights into its developmental functions.
  • Consistent gene expression changes were observed across constitutive and inducible SHL over-expression systems, validating the findings.