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tal-1 (T-cell acute leukemia-1; also known as
SCL) and
tal-2 genes belong to a family of basic helix–loop–helix transcription factors and were originally isolated from the breakpoints of chromosomal translocations in human T-cell leukemia cell lines.
tal-1 is expressed not only in hematopoietic cells but also in several endothelial structures and the central nervous system during development. On the other hand, the detailed function and the sites of expression of
tal-2 have remained obscure. We cloned the
tal-2 cDNA from a mouse embryonic cDNA library and examined its expression pattern in the mouse, comparing with that of
tal-1. In situ analyses revealed that
tal-2 transcripts are detected at embryonic day 12.5 in the following regions; 1) the diencephalon—the zona limitans intrathalamica and the pretectum, 2) the mesencephalon—the tectum, and the anterior and posterior tegmentum, 3) the metencephalon—the isthmus and the anterior pons. In the diencephalon and the mesencephalon, the expression sites of
tal-2 gene were similar to those of
tal-1, and its expression was stronger than that of
tal-1. In the metencephalon,
tal-2 expression was observed in the anterior pons, whereas
tal-1 transcripts were detected in the entire pons, and showed stronger expression than
tal-2. The
tal-2 messages were barely detectable in the brain at birth. These results suggest that
tal-1 and
tal-2 are involved in the development of specific areas of the central nervous system.