Role of cytosolic malate dehydrogenase in oocyte maturation and embryo development

Yoon, Se-Jin; Koo, Deog-Bon; Park, Jung Sun; Choi, Kyung-Hee; Han, Yong-Mahn; Lee, Kyung-Ah

doi:10.1016/j.fertnstert.2006.02.105

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Volume 86, Issue 4, Supplement , Pages 1129-1136, October 2006

Role of cytosolic malate dehydrogenase in oocyte maturation and embryo development

Presented at the 60th annual meeting of the American Society for Reproductive Medicine, Philadelphia, Pennsylvania.

Se-Jin Yoon, Ph.D.
- CHA Research Institute, Fertility Center, CHA General Hospital, Seoul
- Department of Biological Science, College of Natural Sciences, Chung-Ang University, Seoul
Deog-Bon Koo, Ph.D.
- Laboratory of Development and Differentiation, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon
Jung Sun Park, M.Sc.
- Laboratory of Development and Differentiation, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon
Kyung-Hee Choi, Ph.D.
- Department of Biological Science, College of Natural Sciences, Chung-Ang University, Seoul
Yong-Mahn Han, Ph.D.
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology (KAIST), Daejon
Kyung-Ah Lee, Ph.D.
- CHA Research Institute, Fertility Center, CHA General Hospital, Seoul
- Graduate School of Life Science and Biotechnology, Pochon CHA University, Seoul, Korea
- Reprint requests: Kyung-Ah Lee, Ph.D., Graduate School of Life Science and Biotechnology, Pochon CHA University College of Medicine, 606-13, Yeoksam-1-dong, Gangnam-gu, Seoul, 135-081, Korea (FAX: 82-2-563-2028).

Received 7 October 2005; received in revised form 13 February 2006; accepted 13 February 2006. published online 07 September 2006.

Objective

To elucidate the function of cytosolic malate dehydrogenase (Mor2) in oocyte maturation and embryo development using RNA interference (RNAi).

Design

Experimental animal study.

Setting

Research unit of university.

Animal(s)

Female 4-week-old (C57/BL6) mice.

Intervention(s)

Isolation of immature germinal vesicle (GV) oocytes or fertilized pronucleus (PN) embryos, microinjection of Mor2 double-stranded RNA (dsRNA), and reverse transcription and polymerase chain reaction (RT-PCR) analysis to investigate Mor2-specific messenger RNA (mRNA) knockdown.

Main Outcome Measure(s)

Relative changes in mRNA levels after microinjection of Mor2 dsRNA and in rates of oocyte maturation and preimplantation embryo development.

Result(s)

Mor2 mRNA mostly was knocked down in germinal vesicle– and metaphase I (MI)–arrested oocytes, compared with metaphase II (MII)–developed oocytes, after microinjection of Mor2 dsRNA and in vitro culture for 16 hours. In vitro oocyte maturation was significantly decreased (34%), compared with noninjected (73.4%) and buffer-injected (67.5%) control groups. The rate of blastocyst development (48.1%) was lower in the Mor2 dsRNA-injected group than in buffer-injected control (88.2%).

Conclusion(s)

In the present study, the function of Mor2 was analyzed with the aid of RNAi. On the basis of the data obtained, we propose that Mor2 is an essential factor for oocyte maturation and embryo development in mouse.

Key Words: Cytosolic malate dehydrogenase , oocyte maturation , embryo development , RNA interference , double-stranded RNA