Gonadal mesoderm

Yin and Frasch, 1998). Together with the zinc finger homeobox gene zfli-I, tinman is also required for normal formation of the gonadal mesoderm (Boyle et al., 1997 Broihier et al., 1998). It is likely that the functions of tinman in these developmental processes are required during its early phase of expression in the entire trunk mesoderm. 

Figure 3. Model of combinatorial inputs of segmental and dorsoventral cues that determine the formation of individual aniagen in the early mesoderm (see text). Abbreviations A, P A and P domains/compartments cm cardiac mesoderm fb fat body aniagen gm gonadal mesoderm aniagen dsm, Ism, vsm dorsal, lateral, and ventral somatic mesoderm, respectively vm midgut visceral mesoderm aniagen.

Broihier, H., Moore, L., Van Doren, M., Newman, S., and Lehmann, R. (1998). zfli-1 is required for germ cell migration and gonadal mesoderm development in Drosophila. Development J25.655-666. 

Riechmann, V, Rehom, K., Reuter, R., and Leptin, M. (1998). The genetic control of the distinction between fat body and gonadal mesoderm in Drosophila. Development 725 713-723. 

Boyle, M., Bonini, N., and DiNardo, S. (1997). Expression and function of clift in the development of somatic gonadal precursors within the Drosophila mesoderm. Development 724 971-982. 

From the mesoderm are formed the cells of the muscles, of connective tissue, the cells of the adrenal cortex, of the gonads and the urinary tract. 

The most remarkable example of differentiation in cells of mesodermic origin is the metabolic series which continues the process of biosynthesis of the steroid ring (see p. 236). We have already described one of these continuations, the synthesis of bile acids by the liver cell. In the cells of the adrenal cortex and the gonads, other systems continue the biosynthesis of the steroid ring with the formation of steriod hormones. 

---