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Furthermore, our study of dmd-1 in two flatworm species provides evidence for the conservation of sex regulatory function between lophotrochozoans and other metazoans. 22) of the predicted DM domain protein sequences did not detect significant sequence similarities to other DM domain proteins outside the DM domain, consistent with previous phylogenetic analysis of DM domain genes.
In these hermaphrodites, the male gonads are located dorsolaterally and the female gonads are located ventrally at the base of the brain.In addition, dmd-1 has a male-specific role in the maintenance and regeneration of the testes and male accessory reproductive organs.These results demonstrate that dmd-1 is an essential component of pathways responsible for inductive specification of the germline and development of a sex-specific somatic gonadal niche in a simultaneous hermaphrodite.Somatic and germ cells were distinguishable owing to marked differences in the electron density of their cytoplasm and peripheral condensations of heterochromatin in the somatic cells (Fig. The somatic cells seen by TEM likely correspond to dmd-1-expressing cells.Consistent with this idea, the dmd-1-positive cells in the testes of mature sexual planarians did not express germ cell markers, including nanos, germinal histone H4 (ref.Germline stem cells associated with the testes and ovaries can be identified by expression of the germline-specific marker, nanos (Gen Bank/EMBL/DDBJ accession number EF035555.1, Fig. Notably, asexual strains of planarians that reproduce strictly by transverse fission also contain nanos-positive germ cells, but these cells fail to differentiate.
In mature sexual animals, dmd-1 transcripts were detected by WISH in a subset of cells within and in close proximity to the testes (Fig. 1c), and in male accessory reproductive organs (seminal vesicles, sv; sperm ducts, sd; and penis papilla, pp; Fig. Using two-colour fluorescent in situ hybridization (FISH), we found that the dorsolateral dmd-1-expressing cells reside in close proximity to the testes primordia in recently hatched animals (Fig.
In many dioecious species, doublesex/male-abnormal-3 (DM) domain genes have critical roles in sex-specific development and function.
To examine whether such sex-specific functions may also function in simultaneous hermaphrodites, we investigated the role of DM domain genes in the planarian, Schmidtea mediterranea.
nanos-positive germline stem cells of the testes and ovaries (green). (b) WISH showing dmd-1 transcripts in and around (arrows) the testes in a sexually mature planarian.
(c) Ventral view of the animal showing dmd-1 transcripts in the brain (br), sperm ducts (sd), seminal vesicles (sv) and penis papilla (pp) of a sexually mature planarian.
Here we show that a sex-specific gene, Smed-dmd-1 encoding a predicted doublesex/male-abnormal-3 (DM) domain transcription factor, is required for specification of male germ cells in a simultaneous hermaphrodite, the planarian Schmidtea mediterranea.