Production of hand-made cloned buffalo (Bubalus bubalis) embryos from non-viable somatic cells

Abstract

Use of non-viable somatic cells for hand-made cloning (HMC) can enable production of cloned animals from tissues obtained from elite or endangered dead animals. Buffalo skin fibroblast cells were rendered non-viable by heat treatment and used for HMC. Although fusion (93.6±1.72 vs 67.1±2.83%) and cleavage (90.3±1.79 vs 65.8±1.56%) rate was lower (P<0.001) than that for controls, blastocysts could be successfully produced. However, blastocyst rate (34.1±2.43 vs 6.9±2.18%, P<0.001) and total cell number of blastocysts (TCN, 221.3±25.14 vs 151.1±21.69, P<0.05) were lower and apoptotic index (4.8±1.06 vs 10.9±1.21) was higher (P<0.001) than that of controls. In another experiment, ear tissue of slaughterhouse buffaloes was preserved in mustard oil at room temperature for 48h following which somatic cells were harvested by enzymatic digestion and used for HMC. Although fusion (96.8±1.48 vs 84.2±3.19%), cleavage (89.6±3.59 vs 77.2±3.99%), and blastocyst rate (36.9±7.45 vs 13.1±6.87%) were lower (P<0.01), TCN (223.0±27.89 vs 213.3±28.21) and apoptotic index (3.97±0.67 vs 5.22±0.51) of blastocysts were similar to those of controls. In conclusion, HMC can be successfully used for production of blastocysts from non-viable cells and from cells obtained from freshly slaughtered buffaloes. This can pave the way for the restoration of farm or wild animals by HMC if somatic cells could be obtained within a few hours after their death.