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Dynamic changes in mitochondrial DNA, distribution and activity within cat oocytes during folliculogenesis
N Songsasen1, L H Henson1, W Tipkantha2,3
1Center for Species Survival, Smithsonian Conservation Biology Institute, National Zoological Park, Front Royal, VA, USA.
Reproduction in Domestic Animals = Zuchthygiene
|January 24, 2017
Summary
Mitochondrial DNA copy number, distribution, and activity dynamically change in cat oocytes during folliculogenesis. These alterations in mitochondria are crucial for oocyte developmental competence.
Area of Science:
- Reproductive Biology
- Cell Biology
- Mammalian Oogenesis
Background:
- Mitochondria are vital for oocyte development and are linked to developmental competence.
- Understanding mitochondrial dynamics in feline oocytes is essential for reproductive science.
Purpose of the Study:
- To investigate changes in mitochondrial copy number, distribution, and activity during cat oocyte folliculogenesis.
- To correlate these mitochondrial modifications with the acquisition of oocyte developmental competence.
Main Methods:
- Mitochondrial DNA (mtDNA) copy number was quantified using qPCR in oocytes from various follicular stages.
- Mitochondrial distribution and activity were assessed using CMXRos MitoTracker dye in isolated oocytes.
- Oocytes were collected from primordial to advanced antral stages of folliculogenesis.
Main Results:
- Mitochondrial DNA copy number increased significantly, particularly at the small antral stage.
- Mitochondrial distribution shifted from homogeneous to pericortical localization as folliculogenesis progressed.
- Mitochondrial activity, measured by CMXRos fluorescence, progressively increased from pre-antral to advanced antral stages.
Conclusions:
- Cat oocytes exhibit dynamic changes in mitochondrial copy number, distribution, and activity during folliculogenesis.
- These mitochondrial modifications are likely essential for achieving developmental competence in feline oocytes.
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