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LIM homeobox 8 (Lhx8) is a germ cell-specific transcription factor essential for the development of oocytes during early oogenesis. In mice, Lhx8 deficiency causes postnatal oocyte loss and affects the expression of many oocyte-specific genes. The aims of this study were to characterize the bovine  Lhx8  gene, determine its mRNA expression during oocyte development and early embryogenesis, and evaluate its interactions with other oocyte-specific transcription factors. The bovine  Lhx8  gene encodes a protein of 377 amino acids. A splice variant of  Lhx8  ( Lhx8_v1 ) was also identified. The predicted bovine Lhx8 protein contains two LIM domains and one homeobox domain. However, one of the LIM domains in Lhx8_v1 is incomplete due to deletion of 83 amino acids near the N terminus. Both  Lhx8  and  Lhx8_v1  transcripts were only detected in the gonads but none of the somatic tissues examined. The expression of  Lhx8  and  Lhx8_v1  appears to be restricted to oocytes as none of the transcripts was detectable in granulosa or theca cells. The maternal  Lhx8  transcript is abundant in GV and MII stage oocytes as well as in early embryos but disappear by morula stage. A nuclear localization signal that is required for the import of Lhx8 into nucleus was identified, and Lhx8 is predominantly localized in the nucleus when ectopically expressed in mammalian cells. Finally, a novel interaction between Lhx8 and Figla, another transcription factor essential for oogenesis, was detected. The results provide new information for studying the mechanisms of action for Lhx8 in oocyte development and early embryogenesis.

Bovine Lhx8, a Germ Cell-Specific Nuclear Factor, Interacts with Figla