The gene knockout technology has revolutionized the fertility/infertility field. It has revealed several essential previously undiscovered molecules, new insights and novel mechanisms involved in steps of the fertility cascade in females. Using database and literature search, knockouts of at least 83 genes were discovered that demonstrated an effect on fertility of female mice. These effects ranged from abnormality in reproductive structure, ovarian function, oocyte, fertilization, embryonic and fetal development, implantation and pregnancy to delivery. However, only a few of these knockout of genes such as encoding oocyte glycoprotein coat comprised of zona pellucida (ZP) 1, ZP2 and ZP3 and oocute plasma membrane specific proteins showed a specific and exclusive target infertility effect without concomitant effects on the non-reproductive organ system. These molecules will provide novel targets of contraception including contraceptive vaccine development.
To explore the effect of kisspeptin on in vitro maturation of buffalo oocytes under different hormonal combinations. For the present study, Kp@10 µg/ml was selected as optimum by assessing the proportion of Cumulus Cell Expansion (CCE) and extrusion of 1st polar body (PB) from the earlier study conducted. Media containing TCM 199 (supplemented with Gentamicin) and oocytes were used as control. Overall, oocytes were allowed to mature in 12 different maturation media viz., Control (T1), Kp at 10 µg/ml (T2), FSH alone (T3), FSH +Kp (T4), LH (T5), LH +Kp (T6), E2 (T7), E2+Kp (T8), FSH+LH+E2 (T9), FSH+LH+E2+Kp (T10), FSH+LH+E2+FCS+BSA (T11) and FSH+LH+E2+FCS+BSA+Kp (T12), incubated at 38.5°C and 5% CO2 under humidified atmosphere for 22 hours. The results showed significantly (P £ 0.5) higher percentages of CCE and PB in groups supplemented with Kp (T4, T6, T8, T10 and T12,) compared to control (T1) and other treatment groups supplemented with individual hormones either alone (T3, T5 and T7) or combination of hormones (T9) and IVM alone (T11). Therefore, it has been clearly demonstrated that addition of Kp (10 µg/ml) to FSH, LH, E2 supplemented media, in various combinations enhances buffalo oocyte maturation rates in vitro.
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