TATA box-binding transcription factor (By similarity). Members of the TBP family are differentially required to regulate transcription and development during early embryogenesis. Commits mesoderm to the hematopoietic lineage during hemopoiesis, acting via mespa. Binds to the mespa promoter. In adults, expressed in the gonads, with expression much higher in the ovary than the testis (at protein level). Shows a small amount of expression in other adult organs, including the brain and kidney. Embryonic expression is mostly ubiquitous except in early gastrula embryos where expression is asymmetric. Expressed both maternally and zygotically. Already present in fertilized eggs. Expression levels increase until the sphere stage and reduce gradually toward 24 hpf (at protein level). Belongs to the TBP family.