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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.
In contrast to dioecious organisms, simultaneous hermaphrodites produce gametes and accessory reproductive organs of both sexes.
dmd-1 has a male-specific role in the maintenance and regeneration of the testes and male accessory reproductive organs.
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.
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