title: Role of the nanos homolog during sea urchin development.
abstract: The nanos genes play important roles in the development of primordial germ cells in animal species. In the sea urchin, Hemicentrotus pulcherrimus, small micromere descendants specifically express HpNanos mRNA and this expression continues in the left coelomic pouch, which produces the major component of the adult rudiment. In this study, we showed that morpholino knockdown of HpNanos resulted in a delay of primary mesenchyme cell ingression and a decrease in the number of cells comprising the left coelomic pouch. Knockdown analysis in chimeras and whole embryos revealed the disappearance of small micromere descendants from the archenteron tip. Furthermore, the expression of HpNanos mRNA was induced in other cell lineages in the HpNanos-knockdown and micromere-deleted embryos. Taken together, our results suggest that HpNanos is involved in the inductive interaction of small micromere descendants with other cell lineages, and that HpNanos is required for the survival of small micromere descendants.
authors.affiliation: Department of Mathematical and Life Sciences, Graduate School of Science, Hiroshima University, Higashi-Hiroshima, Japan.
authors.forename: Takayoshi
authors.initials: T
authors.lastname: Fujii
authors.forename: Naoaki
authors.initials: N
authors.lastname: Sakamoto
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Ochiai
authors.forename: Kazumasa
authors.initials: K
authors.lastname: Fujita
authors.forename: Yuka
authors.initials: Y
authors.lastname: Okamitsu
authors.forename: Noriko
authors.initials: N
authors.lastname: Sumiyoshi
authors.forename: Takuya
authors.initials: T
authors.lastname: Minokawa
authors.forename: Takashi
authors.initials: T
authors.lastname: Yamamoto
mesh_terms: D000590:Amino Acid Chloromethyl Ketones / Q000378:metabolism; D000818:Animals; D017209:Apoptosis / Q000502:physiology; D019070:Cell Lineage; D049109:Cell Proliferation; D002678:Chimera; D015853:Cysteine Proteinase Inhibitors / Q000378:metabolism; D004625:Embryo, Nonmammalian / Q000166:cytology / Q000502:physiology; D018507:Gene Expression Regulation, Developmental; D009024:Morphogenesis / Q000502:physiology; D016376:Oligonucleotides, Antisense / Q000235:genetics / Q000378:metabolism; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D016601:RNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D012617:Sea Urchins / Q000033:anatomy & histology / Q000196:embryology* / Q000378:metabolism*
chemical_list: D000590:Amino Acid Chloromethyl Ketones; D015853:Cysteine Proteinase Inhibitors; D016376:Oligonucleotides, Antisense; D012333:RNA, Messenger; D016601:RNA-Binding Proteins; D011993:Recombinant Fusion Proteins; C096713:benzyloxycarbonylvalyl-alanyl-aspartyl fluoromethyl ketone