In vitro development of marbled cat embryos derived from interspecies somatic cell nuclear transfer

Area of Science:

• Reproductive Biology
• Conservation Genetics
• Interspecies Somatic Cell Nuclear Transfer (iSCNT)

Background:

• The marbled cat (Pardofelis marmorata) is a small wild cat species facing conservation challenges.
• Somatic Cell Nuclear Transfer (SCNT) is a technique used for cloning, but interspecies applications (iSCNT) are less explored, especially for endangered felids.
• Utilizing readily available domestic cat and rabbit oocytes could offer a viable alternative for conserving marbled cats.

Purpose of the Study:

• To investigate the feasibility of interspecies Somatic Cell Nuclear Transfer (iSCNT) for marbled cats.
• To evaluate the developmental potential of marbled cat embryos cloned using domestic cat and rabbit oocytes.
• To optimize iSCNT protocols by assessing oocyte maturation times and fusion voltages.

Main Methods:

• Marbled cat fibroblast cells were used as donor cells.
• Recipient oocytes were obtained from domestic cats and rabbits.
• Embryo development was assessed after iSCNT using varying oocyte maturation times (24, 36, 42 h) and fusion voltages (2.1, 2.4 kV/cm).
• Developmental rates were compared between interspecies cloned embryos (marbled cat-domestic cat, marbled cat-rabbit) and intraspecies controls (domestic cat-domestic cat, rabbit-rabbit).

Main Results:

• Optimal development of marbled cat-domestic cat cloned embryos occurred when oocytes were matured for 24 hours.
• Fusion efficiency was not significantly affected by varying fusion voltages (2.1 vs. 2.4 kV/cm).
• Developmental rates of marbled cat-domestic cat and domestic cat-domestic cat cloned embryos were comparable, though lower than in vitro fertilized controls.
• Marbled cat-rabbit and domestic cat-rabbit cloned embryos showed similar developmental rates to rabbit-rabbit controls.

Conclusions:

• Marbled cat fibroblast cells can be successfully reprogrammed using domestic cat and rabbit oocytes via iSCNT.
• The study demonstrates the potential of iSCNT as a tool for marbled cat conservation.
• Future research could lead to the production of marbled cat offspring through interspecies cloning.