Hox gene expression in larval development of the polychaetes Nereis virens and Platynereis dumerilii (Annelida, Lophotrochozoa)

@article{Kulakova2006HoxGE,
  title={Hox gene expression in larval development of the polychaetes Nereis virens and Platynereis dumerilii (Annelida, Lophotrochozoa)},
  author={Milana A. Kulakova and Nadezhda I. Bakalenko and Elena L. Novikova and Charles E. Cook and Elena D. Eliseeva and Patrick R H Steinmetz and Roman P Kostyuchenko and Archil K. Dondua and Detlev Arendt and Michael E Akam and Tatiana Andreeva},
  journal={Development Genes and Evolution},
  year={2006},
  volume={217},
  pages={39-54}
}
The bilaterian animals are divided into three great branches: the Deuterostomia, Ecdysozoa, and Lophotrochozoa. The evolution of developmental mechanisms is less studied in the Lophotrochozoa than in the other two clades. We have studied the expression of Hox genes during larval development of two lophotrochozoans, the polychaete annelids Nereis virens and Platynereis dumerilii. As reported previously, the Hox cluster of N. virens consists of at least 11 genes (de Rosa R, Grenier JK, Andreeva T… Expand
ParaHox gene expression in larval and postlarval development of the polychaete Nereis virens (Annelida, Lophotrochozoa)
TLDR
The hypothesis that the ParaHox genes are involved in antero-posterior patterning of the developing embryo is supported, but the notion that these genes function only in the patterned of endodermal tissues is not supported. Expand
Early mesodermal expression of Hox genes in the polychaete Alitta virens (Annelida, Lophotrochozoa)
TLDR
Three Hox genes of the polychaete Alitta virens—Hox2, Hox4, and Lox5—are expressed in the mesodermal anlagen of the three future larval chaetigerous segments in spatially colinear manner before the initiation of Hox expression in the larval ectoderm, the first evidence of sequential Hox gene expression inThe mesoderm of protostomes to date. Expand
Hox and ParaHox gene expression in early body plan patterning of polyplacophoran mollusks
TLDR
In Polyplacophora, the expression patterns of the Hox and ParaHox genes seem to be evolutionarily highly conserved, while in conchiferan mollusks these genes are co‐opted into novel functions that might have led to evolutionary novelties, at least in gastropods and cephalopods. Expand
Expression of Hox genes during regeneration of nereid polychaete Alitta (Nereis) virens (Annelida, Lophotrochozoa)
TLDR
During postlarval growth and regeneration, Hox genes do not alter the diversity of segments but provide the positional information along the anterior-posterior axis, which might be an ancestral function inherited from the common evolutionary remote ancestor. Expand
Activation of Hox genes during caudal regeneration of the polychaete annelid Platynereis dumerilii
TLDR
It is demonstrated that five Platynereis Hox genes belonging to paralog groups 1, 4, 5, 6, and 9–14 are expressed in domains of the regenerating nervous system consistent with providing positional information along the anteroposterior axis of the regenerate, and that expression in regenerating neuromeres is limited to varying subsets of perikarya, called gangliosomes. Expand
Hox gene expression in postmetamorphic juveniles of the brachiopod Terebratalia transversa
TLDR
The results are concordant with morphological observation that metamorphosis in rhynchonelliformean brachiopods, despite being rapid, is rather gradual and could be explained by the inversion of the mantle lobe, which relocates some of the more posterior larval structures into the anterior edge of the juveniles. Expand
Hox gene expression in postmetamorphic juveniles of the brachiopod Terebratalia transversa
TLDR
The results are concordant with morphological observation that metamorphosis in rhynchonelliformean brachiopods, despite being rapid, is rather gradual and could be explained by the inversion of the mantle lobe, which relocates some of the more posterior larval structures into the anterior edge of the juveniles. Expand
Hox gene expression during postlarval development of the polychaete Alitta virens
TLDR
The expression dynamics of the Hox cluster during postlarval development of the nereid Alitta virens are studied and it is found that 8 out of 11 Hox genes are transcribed as wide gene-specific gradients in the ventral nerve cord, ectoderm, and mesoderm. Expand
Hox genes pattern the anterior-posterior axis of the juvenile but not the larva in a maximally indirect developing invertebrate, Micrura alaskensis (Nemertea)
TLDR
Although the pilidiophoran juvenile develops from separate rudiments with no obvious relationship to the embryonic formation of the larva, the Hox genes appear to exhibit canonical expression along the juvenile AP axis, which suggests that the H Cox patterning system can maintain conserved function even when widely decoupled from early polarity established in the egg. Expand
Molecular markers comparing the extremely simple body plan of dicyemids to that of lophotrochozoans: insight from the expression patterns of Hox, Otx, and brachyury
TLDR
The developmental expression patterns of three important regulatory genes, the central type Hox gene (DoxC), otx, and brachyury homologs in the dicyemid mesozoa, Dicyema orientale, provide molecular clues to trace the evolutionary history of degeneration in the cephalopod embryogenesis and life cycle. Expand
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