Related Experiment Video

Updated: Aug 15, 2026

Investigating Tissue- and Organ-specific Phytochrome Responses using FACS-assisted Cell-type Specific Expression Profiling in Arabidopsis thaliana
10:10

Investigating Tissue- and Organ-specific Phytochrome Responses using FACS-assisted Cell-type Specific Expression Profiling in Arabidopsis thaliana

Published on: May 29, 2010

Tissue-specific regulation of cell-cycle responses to DNA damage in Arabidopsis seedlings

Eli Hefner1, Neil Huefner, Anne B Britt

  • 1Graduate Group in Genetics, University of California, Davis, CA 95616, USA.

DNA Repair
|October 4, 2005
PubMed

Insights

Plant DNA damage checkpoints prevent mutations but delay growth. Researchers found these cell-cycle responses differ between plant meristematic and somatic tissues, suggesting a tissue-specific trade-off.

Area of Science:

  • Plant Biology
  • Genetics
  • Cell Biology

Background:

  • Cell-cycle checkpoints safeguard genomic stability by halting cell division upon DNA damage.
  • In mammals, checkpoint activation balances mutation prevention with cancer risk.
  • Plants face high developmental costs from growth delays, making checkpoint regulation critical.

Purpose of the Study:

  • To investigate DNA damage checkpoint responses in different plant tissue types.
  • To compare responses in meristematic (root/shoot tips) versus somatic (stomatal/endoreduplicating) tissues.
  • To determine if conserved checkpoint mechanisms operate across diverse plant tissues.

Main Methods:

  • Exposure of plants to ionizing radiation (IR) to induce DNA damage.
  • Analysis of cell-cycle progression in meristematic and somatic tissues post-IR.
  • Comparative study of checkpoint activation and its impact on development.

Main Results:

  • Ionizing radiation (IR) triggers cell-cycle checkpoint responses in root and shoot tip meristems.
  • These IR-induced cell-cycle responses are not observed in more differentiated somatic tissues.
  • Plant meristems exhibit distinct DNA damage response pathways compared to differentiated tissues.

Conclusions:

  • Plant DNA damage checkpoint responses are tissue-specific.
  • Meristematic tissues prioritize genomic integrity, while somatic tissues may tolerate damage to avoid developmental delays.
  • Understanding these differences is crucial for plant development and stress response research.

More Related Videos

Long-term, High-resolution Confocal Time Lapse Imaging of Arabidopsis Cotyledon Epidermis during Germination12:01

Long-term, High-resolution Confocal Time Lapse Imaging of Arabidopsis Cotyledon Epidermis during Germination

Published on: December 31, 2012

High Resolution Quantification of Crystalline Cellulose Accumulation in Arabidopsis Roots to Monitor Tissue-specific Cell Wall Modifications09:27

High Resolution Quantification of Crystalline Cellulose Accumulation in Arabidopsis Roots to Monitor Tissue-specific Cell Wall Modifications

Published on: May 10, 2016

Related Concept Videos

DNA Damage can Stall the Cell Cycle02:36

DNA Damage can Stall the Cell Cycle

In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
DNA Damage Can Stall the Cell Cycle02:36

DNA Damage Can Stall the Cell Cycle

In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
Negative Regulator Molecules01:23

Negative Regulator Molecules

Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
The Cell Cycle Control System01:28

The Cell Cycle Control System

The cell cycle regulation directs how a cell proceeds from one phase to the next and begins mitosis. The cell cycle control system includes intracellular regulatory molecules and external triggers. They provide "stop" or "advance" signals and operate at specific cell cycle stages termed checkpoints to ensure that a particular process is completed before the cell advances to the next phase.
Cyclins and cyclin-dependent kinases (Cdks) are the primary cell cycle regulators and function at the cell...
The Cell Cycle Control System02:11

The Cell Cycle Control System

The cell cycle is an organized set of events that leads the cell to divide into two daughter cells, each containing chromosomes identical to the parent cell. It is the cell cycle that leads to the formation of an entire organism from a single-cell zygote. Besides, cell division also functions in the renewal or repair of tissues in adult multicellular eukaryotes. For example, in the bone marrow, the stem cells divide to form new blood cells. Although essential for several functions, cell...
Molecular Factors Affecting Cell Division01:27

Molecular Factors Affecting Cell Division

Several external and internal factors influence the initiation and inhibition of cell division. For instance, the death of nearby cells or the release of human growth hormone (hGH) promotes cell division. In contrast, lack of hGH or crowding of cells can inhibit cell division.
Several proteins function as internal regulators to ensure each cell cycle stage is completed faithfully before proceeding to the next. Regulator molecules may act directly or influence the activity or production of other...