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JOURNAL ARTICLES
Plasticity of transposed rhombomeres: Hox gene induction is correlated with phenotypic modifications
A. Grapin-Botton, M.A. Bonnin, L.A. McNaughton, R. Krumlauf, N.M. Le Douarin
Development 1995 121: 2707-2721;
A. Grapin-Botton
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M.A. Bonnin
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L.A. McNaughton
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R. Krumlauf
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N.M. Le Douarin
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Summary

In this study we have analysed the expression of Hoxb-4, Hoxb-1, Hoxa-3, Hoxb-3, Hoxa-4 and Hoxd-4 in the neural tube of chick and quail embryos after rhombomere (r) heterotopic transplantations within the rhombencephalic area. Grafting experiments were carried out at the 5-somite stage, i.e. before rhombomere boundaries are visible. They were preceeded by the establishment of the precise fate map of the rhombencephalon in order to determine the presumptive territory corresponding to each rhombomere. When a rhombomere is transplanted from a caudal to a more rostral position it expresses the same set of Hox genes as in situ. By contrast in many cases, if rhombomeres are transplanted from rostral to caudal their Hox gene expression pattern is modified. They express genes normally activated at the new location of the explant, as evidenced by unilateral grafting. This induction occurs whether transplantation is carried out before or after rhombomere boundary formation. Moreover, the fate of the cells of caudally transplanted rhombomeres is modified: the rhombencephalic nuclei in the graft develop according to the new location as shown for an r5/6 to r8 transplantation. Transplantation of 5 consecutive rhombomeres (i.e. r2 to r6), to the r8 level leads to the induction of Hoxb-4 in the two posteriormost rhombomeres but not in r2,3,4. Transplantations to more caudal regions (posterior to somite 3) result in some cases in the induction of Hoxb-4 in the whole transplant. Neither the mesoderm lateral to the graft nor the notochord is responsible for the induction. Thus, the inductive signal emanates from the neural tube itself, suggesting that planar signalling and predominance of posterior properties are involved in the patterning of the neural primordium.

Reference

    1. Alvarado-Mallart R.-M.,
    2. Martinez S.,
    3. Lance-Jones C. C.
    (1990) Pluripotentiality of the 2-day-old avian germinative neuroepithelium. Dev. Biol 139, 75–88
    OpenUrlCrossRefPubMedWeb of Science
    1. Bally-Cuif L.,
    2. Alvarado-Mallart R.-M.,
    3. Darnell D. K.,
    4. Wassef M.
    (1992) Relashionship between Wnt-1 and En-2 expression domains during early development of normal and ectopic met-mesencephalon. Development 115, 999–1009
    OpenUrlAbstract
    1. Bally-Cuif L.,
    2. Wassef M.
    (1994) Ectopic induction and reorganization of Wnt-1 expression in quail/chick chimeras. Development 120, 3379–3394
    OpenUrlAbstract
    1. Carpenter E. M.,
    2. Goddard J. M.,
    3. Chisaka O.,
    4. Manley N. R.,
    5. Capecchi M. R.
    (1993) Loss of Hox-A1 (Hox-1. 6) function results in the reorganization of the murine hindbrain. Development 118, 1063–1075
    OpenUrlAbstract/FREE Full Text
    1. Chen Y.,
    2. Huang L.,
    3. Solursh M.
    (1994) A concentration gradient of retinoids in the early Xenopus laevis embryo. Dev. Biol 161, 70–76
    OpenUrlCrossRefPubMedWeb of Science
    1. Chisaka O.,
    2. Capecchi M. R.
    (1991) Regionally restricted developmental defects resulting from targeted disruption of the mouse homeobox gene Hox-1. 5. Nature 350, 473–479
    OpenUrlCrossRefPubMed
    1. Condie B. G.,
    2. Capecchi M. R.
    (1994) Mice with targeted disruptions in the paralogous genes hoxa-3 and Hoxd-3 reveal synergistic interactions. Nature 370, 304–307
    OpenUrlCrossRefPubMed
    1. Doniach T.
    (1993) Planar and vertical induction of anteroposterior pattern during the development of the amphibian central nervous system. J. Neurobiol 24, 1256–1275
    OpenUrlCrossRefPubMedWeb of Science
    1. Durston A. J.,
    2. Timmermans J. P. M.,
    3. Hage W. J.,
    4. Hendricks H. F. J.,
    5. de Vries N. J.,
    6. Heideveld M.,
    7. Nieuwkoop P. D.
    (1989) Retinoic acid causes an anteroposterieur transformation of the developing central nervous system. Nature 340, 140–144
    OpenUrlCrossRefPubMed
    1. Eichmann A.,
    2. Marcelle C.,
    3. Breant C.,
    4. Le Douarin N. M.
    (1993) 2 Molecules related to the VEGF receptor are expressed in early endothelial cells during avian embryonic development. Mech. Dev 42, 33–48
    OpenUrlCrossRefPubMedWeb of Science
    1. Eyal-Giladi H.
    (1954) Dynamic aspects of neural induction. Arc. Biol 65, 180–259
    OpenUrl
    1. Frasch M.,
    2. Xiaowei C.,
    3. Lufkin T.
    (1995) Evolutionary-conserved enhancers direct region-specific expression of the murine Hoxa-1 and Hoxa-2 loci in both mice and Drosophila. Development 121, 957–974
    OpenUrlAbstract
    1. Fraser S.,
    2. Keynes R.,
    3. Lumsden A.
    (1990) Segmentation in the chick embryo hindbrain is defined by cell lineage restriction. Nature 344, 431–435
    OpenUrlCrossRefPubMed
    1. Gardner C. A.,
    2. Barald K. F.
    (1991) The cellular environment controls the expression of engrailed-like protein in the cranial neuroepithelium of quail-chick chimeric embryos. Development 113, 1037–1048
    OpenUrlAbstract
    1. Gaunt S. J.,
    2. Strachan S.
    (1994) Forward spreading in the establishment of a Vertebrate Hox expression boundary: the expression domain separates into anterior and posterior zones, and the spread occurs across implanted glass barriers. Dev. Dynam 199, 229–240
    OpenUrlPubMed
    1. Gendron-Maguire M.,
    2. Mallo M.,
    3. Zhang Z.,
    4. Gridley T.
    (1993) Hoxa-2 mutant mice exhibit homeotic transformation of skeletal elements derived from cranial neural crest. Cell 75, 1317–1331
    OpenUrlCrossRefPubMedWeb of Science
    1. Gonzalez-Reyes A.,
    2. Macias A.,
    3. Morata G.
    (1992) Autocatalysis and phenotypic expression of Drosophila homeotic gene deformed: its dependence on polarity and homeotic gene function. Development 116, 1059–1068
    OpenUrlAbstract/FREE Full Text
    1. Graham A.,
    2. Heyman I.,
    3. Lumsden A.
    (1993) Even-numbered rhombomeres control the apoptotic elimination of neural crest cells from odd-numbered rhombomeres in the chick hindbrain. Development 119, 233–245
    OpenUrlAbstract
    1. Guthrie S.,
    2. Muchamore I.,
    3. Kuroiwa A.,
    4. Marshall H.,
    5. Krumlauf R.,
    6. Lumsden A.
    (1992) Neurectodermal autonomy of Hox-2. 9 expression reaveled by rhombomere transpositions. Nature 356, 157–159
    OpenUrlCrossRefPubMed
    1. Guthrie S.,
    2. Prince V.,
    3. Lumsden A.
    (1993) Selective dispersal of avian rhombomere cells in orthotopic and heterotopic grafts. Development 118, 527–538
    OpenUrlAbstract
    1. Hamburger V.,
    2. Hamilton H. L.
    (1951) A series of normal stages in the development of the chick embryo. J. Morphol 88, 49–92
    OpenUrlCrossRefWeb of Science
    1. Harkmark W.
    (1954) Cell migrations from the rhombic lip to the inferior olive, the nucleus raphe and the pons. A morphological and experimental investigation on chick embryos. J. comp. Neurol 100, 115–209
    OpenUrlCrossRefPubMedWeb of Science
    1. Hunt P.,
    2. Wilkinson D.,
    3. Krumlauf R.
    (1991) Patterning of the vertebrate head: murine Hox 2 genes mark distinct subpopulations of premigratory and migrating cranial neural crest. Development 112, 43–50
    OpenUrlAbstract
    1. Itasaki N.,
    2. Ichijo H.,
    3. Hama C.,
    4. Matsuno T.,
    5. Nakamura H.
    (1991) Establishment of rostrocaudal polarity in tectal primordium-engrailed expression and subsequent tectal polarity. Development 113, 1133–1144
    OpenUrlAbstract
    1. Izpisua-Belmonte J.-C.,
    2. Tickle C.,
    3. Dolle P.,
    4. Wolpert L.,
    5. Duboule D.
    (1991) Expression of the homeobox Hox-4 genes and the specification of position in chick wingdevelopment. Nature 350, 585–589
    OpenUrlCrossRefPubMed
    1. Kessel M.,
    2. Gruss P.
    (1991) Homeotic transformations of murine vertebrae and concomitant alteration of Hox codes induced by retinoic acid. Cell 67, 89–104
    OpenUrlCrossRefPubMedWeb of Science
    1. Keynes R.,
    2. Lumsden A.
    (1990) Segmentation and the origin of regional diversity in the vertebrate central nervous system. Neuron 2, 1–9
    1. Kintner C. R.,
    2. Melton D. A.
    (1987) Expression of Xenopus N-CAM RNA is an early response to neural induction. Development 99, 311–325
    OpenUrlAbstract
    1. Krumlauf R.
    (1994) Hox genes in vertebrate development. Cell 78, 191–201
    OpenUrlCrossRefPubMedWeb of Science
    1. Kuratani S. C.,
    2. Eichele G.
    (1993) Rhombomere transplantation repatterns the segmental organization of cranial nerves and reveals cell-autonomous expression of a homeodomain protein. Development 117, 105–117
    OpenUrlAbstract/FREE Full Text
    1. Le Douarin N. M.
    (1969) Particularites du noyau interphasique chez la Caille japonaise (Coturnix coturnix japonica). Utilisation de ces particularites comme marquage biologique dans les recherches. Bull. Biol. Fr. Belg 103, 435–452
    OpenUrlPubMed
    1. Lumsden A.
    (1990) The cellular basis of segmentation in the developing hindbrain. Trends Neurosci 13, 329–335
    OpenUrlCrossRefPubMedWeb of Science
    1. Lumsden A.,
    2. Sprawson N.,
    3. Graham A.
    (1991) Segmental origin and migration of neural crest cells in the hindbrain region of the chick embryo. Development 113, 1281–1291
    OpenUrlAbstract
    1. Maden M.,
    2. Hunt P.,
    3. Eriksson U.,
    4. Kuroiwa A.,
    5. Krumlauf R.,
    6. Summerbell D.
    (1991) Retinoic acid-binding, rhombomeres and the neural crest. Development 111, 35–44
    OpenUrlAbstract
    1. Mangold O.
    (1933) Über die Induktionfähigkeit der verschiedenen Bezirke der Neurula von Urodelen. Naturwiss 21, 761–766
    OpenUrlCrossRefWeb of Science
    1. Marshall H.,
    2. Nonchev S.,
    3. Sham M. H.,
    4. Muchamore I.,
    5. Lumsden A.,
    6. Krumlauf R.
    (1992) Retinoic acid alters hindbrain Hox code and induces the transformation of r2/3 into r4/5 identity. Nature 360, 737–741
    OpenUrlCrossRefPubMed
    1. Marshall H.,
    2. Studer M.,
    3. Pöpperl H.,
    4. Aparicio S.,
    5. Kuroiwa A.,
    6. Brenner S.,
    7. Krumlauf R.
    (1994) A conserve retinoic acid response element required for early expression of the homeobox gene Hoxb-1. Nature 370, 567–571
    OpenUrlCrossRefPubMed
    1. Mark M.,
    2. Lufkin T.,
    3. Vonesch J. L.,
    4. Ruberte E.,
    5. Olivo J.-C.,
    6. Dolle P.,
    7. Gorry P.,
    8. Lumsden A.,
    9. Chambon P.
    (1993) Two rhombomeres are altered in Hoxa-1 mutant mice. Development 119, 319–338
    OpenUrlAbstract
    1. Mavilio F.
    (1993) Regulation of vertebrate homeobox-containing genes by morphogens. Europ. J. Biochem 212, 273–288
    OpenUrlPubMedWeb of Science
    1. McGinnis W.,
    2. Krumlauf R.
    (1992) Homeobox genes and axial patterning. Cell 68, 283–302
    OpenUrlCrossRefPubMedWeb of Science
    1. Nieto M. A.,
    2. Gilardi-Hebenstein P.,
    3. Charnay P.,
    4. Wilkinson D.
    (1992) A receptor protein tyrosine kinase implicated in the segmental patterning of the hindbrain and mesoderm. Development 116, 1137–1150
    OpenUrlAbstract/FREE Full Text
    1. Nieuwkoop P. D.
    (1952) Activation and organization of the central nervous system in amphibians. III. Synthesis of a new working hypothesis. J. Exp. Zool 120, 83–108
    OpenUrlCrossRef
    1. Nieuwkoop P. D.
    (1952) Activation and induction of the central nervous system in amphibians. II. Differentiation and organization. J. Exp. Zool 120, 33–81
    OpenUrlCrossRef
    1. Nieuwkoop P. D.
    (1952) Activation and organization of the central nervous system in amphibians I. Induction and activation. J. Exp. Zool 120, 1–32
    OpenUrlCrossRef
    1. Noden D.
    (1978) The control of avian cephalic neural crest cytodifferentiation I: Skeletal and connective tissues. Dev. Biol 67, 296–312
    OpenUrlCrossRefPubMedWeb of Science
    1. Noden D.
    (1983) The role of the neural crest in patterning of avian cranial skeletal, connective and muscle tissues. Dev. Biol 96, 144–165
    OpenUrlCrossRefPubMedWeb of Science
    1. Orr
    (1887) Contribution to the embryology of the lizard. J. Morph 1, 311–372
    OpenUrlCrossRef
    1. Prince V.,
    2. Lumsden A.
    (1994) Hoxa-2 expression in normal and transposed rhombomeres: independent regulation in the neural tube and neural crest. Development 120, 911–923
    OpenUrlAbstract
    1. Rijli F. M.,
    2. Mark M.,
    3. Lakkaraju S.,
    4. Dierich A.,
    5. Dolle P.,
    6. Chambon P.
    (1993) A homeotic transformation is generated in the rostral branchial region of the head by disruption of Hoxa-2, which acts as a selector gene. Cell 75, 1333–1349
    OpenUrlCrossRefPubMedWeb of Science
    1. Ruiz i Altaba A.
    (1993) Induction and axial patterning of the neural plate: planar and vertical signals. J. Neurobiol 24, 1276–1304
    OpenUrlCrossRefPubMedWeb of Science
    1. Slack J. M. W.,
    2. Tannahill D.
    (1992) Mechanism of anteroposterior axis specification in vertebrates. Development 114, 285–302
    OpenUrlAbstract
    1. Sechrist J.,
    2. Serbedzija G.,
    3. Schershon T.,
    4. Fraser S.,
    5. Bronner-Fraser M.
    (1993) Segmental migration of the hindbrain neural crest does not arise from segmental generation. Development 118, 691–703
    OpenUrlAbstract
    1. Simon H.,
    2. Hornbruch A.,
    3. Lumsden A.
    (1995) Independent assignment of antero-posterior and dorso-ventral positional values in the developing chick hindbrain. Cur. Biol 5, 205–214
    OpenUrlCrossRefPubMedWeb of Science
    1. Studer M.,
    2. Popperl H.,
    3. Marshall H.,
    4. Kuroiwa A.,
    5. Krumlauf R.
    (1994) Role of a conserved retinoic acid response element in rhombomere restriction of Hoxb-1. Science 265, 1728–1732
    OpenUrlAbstract/FREE Full Text
    1. Sundin O. H.,
    2. Eichele G.
    (1992) An early marker of axial pattern in the chick embryo and its respecification by retinoic acid. Development 114, 841–852
    OpenUrlAbstract
    1. Tan K.,
    2. Le Douarin N. M.
    (1991) Development of the nuclei and cell migration in the medulla o, blongata. Anat. Embryol 183, 321–343
    OpenUrlPubMed
    1. Vaage S.
    (1969) The segmentation of the primitive neural tube in chick embryo (Gallus domesticus). Adv. Anat. Embryol. Cell Biol 41, 1–88
    OpenUrl
    1. Wilkinson D. G.,
    2. Peters G.,
    3. Dickson C.,
    4. McMahon A. P.
    (1988) Expression of the FGF-related protooncogene int-2 during gastrulation and neurulation in the mouse. EMBO J 7, 691–695
    OpenUrlPubMedWeb of Science
    1. Wilkinson D. G.,
    2. Bhatt S.,
    3. Chavrier P.,
    4. Bravo R.,
    5. Charnay P.
    (1989) Segment-specific expression of a zinc-finger gene in the developing nervous system of the mouse. Nature 337, 461–464
    OpenUrlCrossRefPubMed
    1. Wilkinson D. G.
    (1993) Molecular mechanisms of segmental patterning in the vertebrate hindbrain and neural crest. BioEssays 15, 8–.
    OpenUrl
    1. Zhang M.,
    2. Kim H.-J.,
    3. Marshall H.,
    4. Gendron-Maguire M.,
    5. Lucas D. A.,
    6. Baron A.,
    7. Gudas L. J.,
    8. Gridley T.,
    9. Krumlauf K.,
    10. Grippo J. F.
    (1994) Ectopic Hoxa-1 induces rhombomere transformation in mouse hindbrain. Development 120, 2431–2442
    OpenUrlAbstract/FREE Full Text
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JOURNAL ARTICLES
Plasticity of transposed rhombomeres: Hox gene induction is correlated with phenotypic modifications
A. Grapin-Botton, M.A. Bonnin, L.A. McNaughton, R. Krumlauf, N.M. Le Douarin
Development 1995 121: 2707-2721;
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JOURNAL ARTICLES
Plasticity of transposed rhombomeres: Hox gene induction is correlated with phenotypic modifications
A. Grapin-Botton, M.A. Bonnin, L.A. McNaughton, R. Krumlauf, N.M. Le Douarin
Development 1995 121: 2707-2721;

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