Expression of anterior Hox genes during larval development of the gastropod Haliotis asinina

@article{Hinman2003ExpressionOA,
  title={Expression of anterior Hox genes during larval development of the gastropod Haliotis asinina},
  author={Veronica F. Hinman and Elizabeth O'Brien and Gemma Sian Richards and Bernard M. Degnan},
  journal={Evolution \& Development},
  year={2003},
  volume={5}
}
Summary We report the spatial expression patterns of five anterior Hox genes during larval development of the gastropod mollusc Haliotis asinina, an unsegmented spiralian lophotrochozoan. Molecular alignments and phylogenetic analysis indicate that these genes are homologues of Drosophila HOM‐C genes labial, proboscipedia, zen, Deformed, and Sex combs reduced; the abalone genes are named Has‐Hox1, ‐Hox2, ‐Hox3, ‐Hox4, and ‐Hox5. Has‐Hox transcripts are first detected in the free‐swimming… 
Expression of Hox genes during the larval development of the snail, Gibbula varia (L.)—further evidence of non-colinearity in molluscs
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The hypothesis that apical organ neurosensory cells contribute to the formation of cerebral ganglia commissures during metamorphosis is supported, supporting the ancestral role of Hox genes in the neurogenesis processes in bilaterians.
Coordinated spatial and temporal expression of Hox genes during embryogenesis in the acoel Convolutriloba longifissura
TLDR
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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.
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.
Staggered Hox expression is more widespread among molluscs than previously appreciated
TLDR
A last common molluscan ancestor with colinear Hox expression in predominantly ectodermal tissues along the anterior–posterior axis is suggested.
Hox gene expression during the development of the phoronid Phoronopsis harmeri
TLDR
The lack of Hox gene expression during early development of P. harmeri indicates that the larval body develops without positional information of the Hox patterning system, which might be a consequence of the evolutionary intercalation of the larva form into an ancestral, direct life cycle of phoronids.
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.
Hox gene expression in larval development of the polychaetes Nereis virens and Platynereis dumerilii (Annelida, Lophotrochozoa)
TLDR
Hox gene expression in nereids conforms to the canonical patterns postulated for the two other evolutionary branches of the Bilateria, the Ecdysozoa and the Deuterostomia, thus supporting the evolutionary conservatism of the function of Hox genes in development.
Non-collinear Hox gene expression in bivalves and the evolution of morphological novelties in mollusks
TLDR
The data support the notion that Hox gene expression has been coopted independently, and to varying degrees, into lineage-specific structures in the respective conchiferan clades.
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References

SHOWING 1-10 OF 81 REFERENCES
Expression of a Scr/Hox5 gene in the larval central nervous system of the gastropod Haliotis, a non‐segmented spiralian lophotrochozoan
TLDR
The expression of Hru‐Hox5 in the central region of the abalone CNS is similar to that observed for its orthologue (Lox20 ) in the leech, suggesting that Hox5 genes were used to pattern the CNS of the ancestral spiralian lophotrochozoan.
Expression patterns of anterior Hox genes in the polychaete Chaetopterus: correlation with morphological boundaries.
TLDR
Expression patterns for five Hox genes were examined by whole-mount in situ hybridization in larvae of Chaetopterus, a polychaete annelid with a tagmatized axial body plan and reveal a biphasic expression pattern, which may reflect a reorganization of Hox gene regulation related to the evolutionary reorganized body plan.
Spatial expression of Hox cluster genes in the ontogeny of a sea urchin.
TLDR
The spatial expression patterns of the Hox genes illuminate the evolutionary process by which the pentameral echinoderm body plan emerged from a bilateral ancestor.
Conserved anterior boundaries of Hox gene expression in the central nervous system of the leech Helobdella.
TLDR
In situ hybridization reveals that the four Hox gene homologs isolated from glossiphoniid leeches of the genus Helobdella are all expressed at high levels within the segmented portion of the central nervous system (CNS), with variable levels of expression in the segmental mesoderm.
Quantitative assessment of Hox complex expression in the indirect development of the polychaete annelid Chaetopterus sp.
TLDR
This study shows that an indirectly developing lophotrochozoan shares with an indirect developing deuterostome, the sea urchin, a common mode of Hox complex utilization: construction of the larva, whether a trochophore or dipleurula, does not involve Hox cluster expression, but in both forms the complex is expressed in the set-aside cells from which the adult body plan derives.
Developmental expression of a class IV POU gene in the gastropod Haliotis asinina supports a conserved role in sensory cell development in bilaterians
TLDR
The developmental expression of HasPOU-IV is characterised in the gastropod mollusc, Haliotis asinina and it is inferred that this class of POU-domain genes had an ancestral role in regulating sensory cell development.
Neuroectodermal and endodermal expression of the ascidian Cdx gene is separated by metamorphosis
TLDR
Data suggest that the evolution of the novel ascidian biphasic body plan was not accompanied by a deployment of these genes into new pathways but by a temporal separation of tissue-specific expression.
HOX genes in the sepiolid squid Euprymna scolopes: Implications for the evolution of complex body plans
TLDR
The phylogenetic analysis and in particular the identification of Post-1 and Post-2 homologs support the Lophotrochozoan clade and are consistent with the presence of a single Hox gene cluster in cephalopods.
Mox homeobox expression in muscle lineage of the gastropod Haliotis asinina: evidence for a conserved role in bilaterian myogenesis
TLDR
The expression of Has-Mox, a Mox gene from the gastropod Haliotis asinina, is described, suggesting a conserved role in myogenesis in deuterostomes and lophotrochozoans.
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