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Related Concept Videos

Non-nuclear Inheritance01:29

Non-nuclear Inheritance

Most DNA resides in the nucleus of a cell. However, some organelles in the cell cytoplasm⁠—such as chloroplasts and mitochondria⁠—also have their own DNA. These organelles replicate their DNA independently of the nuclear DNA of the cell in which they reside. Non-nuclear inheritance describes the inheritance of genes from structures other than the nucleus.
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Animal Mitochondrial Genetics

Among all the organelles in an animal cell, only mitochondria have their own independent genomes. Animal mitochondrial DNA is a double-stranded, closed-circular molecule with around 20,000 base pairs. Mitochondrial DNA is unique in that one of its two strands, the heavy, or H, -strand is guanine rich, whereas the complementary strand is cytosine rich and called the light, or L, -strand. Compared to nuclear DNA, mitochondrial DNA has a very low percentage of non-coding regions and is marked by...
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A eukaryotic cell can have up to three different types of genetic systems: nuclear, mitochondrial, and chloroplast. During evolution, organelles have exported many genes to the nucleus; this transfer is still ongoing in some plant species. Approximately 18% of the Arabidopsis thaliana nuclear genome is thought to be derived from the chloroplast’s cyanobacterial ancestor, and around 75% of the yeast genome derived from the mitochondria’s bacterial ancestor. This export has occurred irrespective...

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Isolation and Respiratory Measurements of Mitochondria from Arabidopsis thaliana
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Arabidopsis thaliana organellar DNA polymerase IB mutants exhibit reduced mtDNA levels with a decrease in

John D Cupp1, Brent L Nielsen

  • 1Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT 84602, USA.

Physiologia Plantarum
|November 22, 2012
PubMed
Summary

Plant DNA polymerase IB (polIB) is crucial for maintaining mitochondrial DNA (mtDNA) levels and organelle function. Mutations in polIB disrupt mtDNA replication, impacting plant growth and cell homeostasis.

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Area of Science:

  • Plant molecular biology
  • Organelle genetics
  • Cellular homeostasis

Background:

  • Plant organelle genomes (mitochondria and chloroplasts) have complex replication and maintenance mechanisms that are not fully understood.
  • Arabidopsis thaliana possesses two dual-targeted DNA polymerases, polIA and polIB, with differential expression patterns in plant tissues.
  • PolIB expression is higher in non-photosynthetic tissues, suggesting specialized roles beyond chloroplasts.

Purpose of the Study:

  • To investigate the function of Arabidopsis thaliana DNA polymerase IB (polIB) in organelle DNA replication and maintenance.
  • To elucidate the roles of polIA and polIB in mitochondrial DNA (mtDNA) replication.
  • To understand the phenotypic consequences of polIB mutations on plant growth and cellular processes.

Main Methods:

  • Analysis of Arabidopsis T-DNA polIB mutants.
  • Quantification of mitochondrial and chloroplast DNA levels.
  • Assessment of organelle numbers, density, and respiration/photosynthesis capacities.
  • Gene expression analysis of organelle-encoded genes.

Main Results:

  • PolIB mutants showed a 30% reduction in mtDNA levels and a 70% increase in polIA gene expression.
  • Mutants exhibited increased mitochondrial numbers but decreased mitochondrial area density, alongside altered respiration and photosynthesis.
  • Early plastid development was transiently affected, while mitochondrial defects persisted, indicating polIB's critical role in mtDNA replication.

Conclusions:

  • Both polIA and polIB are essential for mtDNA replication in Arabidopsis thaliana.
  • PolIB mutants compensate by upregulating polIA and adjusting cell homeostasis, but this comes at the cost of impaired cell expansion and growth.
  • The study highlights the intricate coordination between organelle DNA maintenance and overall plant development.