TATA box-binding transcription factor. Members of the TBP family are differentially required to regulate transcription and development during early embryogenesis. Required for gastrulation. Regulates a large subset of genes that are ventrally expressed. Binds to a subset of promoters. Expression is restricted to the gonads, and is higher in the ovary than the testis. Expressed both maternally and zygotically. Abundant in oocytes and expressed in embryos at a lower level, dropping between embryonic stages 6.5 and 12. Belongs to the TBP family.