The zebrafish spiel-ohne-grenzen (spg) gene encodes the POU domain protein Pou2 related to mammalian Oct4 and is essential for formation of the midbrain and hindbrain, and for pre-gastrula morphogenesis.

Abstract excerpt

In early embryonic development, the brain is divided into three main regions along the anteroposterior axis: the forebrain, midbrain and hindbrain. Through retroviral insertional mutagenesis and chemical mutagenesis experiments in zebrafish, we have isolated mutations that cause abnormal hindbrain organization and a failure of the midbrain-hindbrain boundary (MHB) to form, a region that acts as an organizer for...

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