Molecular markers for germ cell differentiation in the demosponge Suberites domuncula.
Sponges (phylum Porifera) are simple metazoans for which no molecular information on gametogenesis and larval development is available. To support the current study, it was confirmed by histology that oocytes and larvae were produced by the demosponge Suberites domuncula. Three genes/expressed products from S. domuncula whose expression correlated with sexual reproduction were identified and characterized (they are used here as marker genes): i) a receptor tyrosine kinase (RTK) with sequence similarity in the tyrosine kinase domain to fibroblast growth factor receptors; ii) the sex-determining protein FEM1 and iii) the sperm associated antigen (SAA) of triploblasts. Antibodies against the extracellular domain of the RTK specifically stained oocytes and larvae in S. domuncula tissue sections. Induction of these three genes was successful at elevated temperature, a factor which also promotes natural gametogenesis. In situ hybridization analyses revealed that FEM1 and SAA were expressed in those areas in which gametogenesis begins. Our results indicate that genes which play a role in sex determination may be present in Porifera.
Institut für Physiologische Chemie, Abteilung Angewandte Molekularbiologie, Universität, Mainz, Germany.
Sanja
S
Perović-Ottstadt
Helena
H
Cetković
Vera
V
Gamulin
Heinz C
HC
Schröder
Klaus
K
Kropf
Claire
C
Moss
Michael
M
Korzhev
Bärbel
B
Diehl-Seifert
Isabel M
IM
Müller
Werner E G
WE
Müller
D000595:Amino Acid Sequence; D000818:Animals; D000941:Antigens / Q000235:genetics; D001483:Base Sequence; D015415:Biomarkers / Q000378:metabolism; D002454:Cell Differentiation; D004247:DNA / Q000235:genetics; D005260:Female; D018507:Gene Expression Regulation, Developmental; D008297:Male; D008969:Molecular Sequence Data; D009865:Oocytes / Q000166:cytology / Q000378:metabolism; D010802:Phylogeny; D020794:Receptor Protein-Tyrosine Kinases / Q000235:genetics / Q000378:metabolism; D012621:Seasons; D017386:Sequence Homology, Amino Acid; D019849:Sex Determination Processes; D013094:Spermatozoa / Q000276:immunology / Q000378:metabolism; D047233:Suberites / Q000166:cytology* / Q000235:genetics / Q000378:metabolism
D000941:Antigens; D015415:Biomarkers; D004247:DNA; D020794:Receptor Protein-Tyrosine Kinases