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Piezo-assisted nuclear transfer affects cloning efficiency and may cause apoptosis
Yang Yu1, Chenhui Ding, Eryao Wang
1State Key Laboratory of Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China.
Reproduction (Cambridge, England)
|July 10, 2007
Summary
Nuclear transfer in mammals is inefficient. Piezoelectric microinjection, a cloning technique, can damage DNA, leading to developmental issues and lower success rates compared to electrofusion.
Area of Science:
- Reproductive Biology
- Developmental Biology
- Genetics
Background:
- Mammalian nuclear transfer (cloning) is inefficient, often due to incomplete donor chromatin reprogramming.
- The specific impact of different nuclear transfer techniques on embryo quality is not fully understood.
- Electrofusion and piezoelectric microinjection are the primary methods for reconstructing embryos.
Purpose of the Study:
- To compare the developmental competence and quality of mammalian embryos reconstructed via electrofusion versus piezoelectric microinjection.
- To investigate the influence of varying piezoelectric electric strengths on embryo development and integrity.
- To assess the impact of nuclear transfer methods on nuclear integrity, blastocyst cell numbers, and apoptosis.
Main Methods:
- Reconstruction of mammalian embryos using either electrofusion or piezoelectric microinjection.
- In vitro and in vivo assessment of embryo development and quality.
- Analysis of blastomere nuclear integrity, blastocyst morphology, cell count, and apoptosis rates.
Main Results:
- Piezoelectric microinjection induced DNA damage, apoptosis, and reduced cell numbers in blastocysts.
- Embryos reconstructed with piezoelectric injection showed a lower rate of development to term compared to electrofusion.
- Higher electric strengths in piezoelectric setups exacerbated negative effects on embryo quality and development.
Conclusions:
- Piezo-assisted micromanipulation can compromise the integrity of reconstructed mammalian embryos.
- Electrofusion appears to be a safer method for nuclear transfer, yielding higher quality embryos.
- Piezoelectric injection should be employed cautiously with minimal electric parameters to mitigate adverse effects.
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