12 results on '"Hanley O"'
Search Results
2. Assessment of the uncertainties in the Radiological Protection Institute of Ireland (RPII) radon measurements service
- Author
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Hanley, O., Gutiérrez-Villanueva, J.L., Currivan, L., and Pollard, D.
- Published
- 2008
- Full Text
- View/download PDF
3. Certified reference materials for radionuclides in Bikini Atoll sediment (IAEA-410) and Pacific Ocean sediment (IAEA-412)
- Author
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Pham, M. K., van Beek, P., Carvalho, F. P., Chamizo, E., Degering, D., Engeler, C., Gurriaran, R., Hanley, O., Harms, A. V., Herrmann, J., Hult, M., Ikeuchi, Y., Ilchmann, C., Kanisch, G., Kis-Benedek, G., Kloster, M., Laubenstein, M., Llaurado, M., Mas, J. L., Nakano, M., Nielsen, Sven Poul, Osvath, I., Povinec, P. P., Rieth, U., Schikowski, J., Smedley, P. A., Suplinska, M., Sýkora, I., Tarjan, S., Varga, B., Vasileva, E., Zalewska, T., Zhou, W., Pham, M. K., van Beek, P., Carvalho, F. P., Chamizo, E., Degering, D., Engeler, C., Gurriaran, R., Hanley, O., Harms, A. V., Herrmann, J., Hult, M., Ikeuchi, Y., Ilchmann, C., Kanisch, G., Kis-Benedek, G., Kloster, M., Laubenstein, M., Llaurado, M., Mas, J. L., Nakano, M., Nielsen, Sven Poul, Osvath, I., Povinec, P. P., Rieth, U., Schikowski, J., Smedley, P. A., Suplinska, M., Sýkora, I., Tarjan, S., Varga, B., Vasileva, E., Zalewska, T., and Zhou, W.
- Abstract
The preparation and characterization of certified reference materials (CRMs) for radionuclide content in sediments collected offshore of Bikini Atoll (IAEA-410) and in the open northwest Pacific Ocean (IAEA-412) are described and the results of the certification process are presented. The certified radionuclides include: 40K, 210Pb (210Po), 226Ra, 228Ra, 228Th, 232Th, 234U, 238U, 239Pu, 239+240Pu and 241Am for IAEA-410 and 40K, 137Cs, 210Pb (210Po), 226Ra, 228Ra, 228Th, 232Th, 235U, 238U, 239Pu, 240Pu and 239+240Pu for IAEA-412. The CRMs can be used for quality assurance and quality control purposes in the analysis of radionuclides in sediments, for development and validation of analytical methods and for staff training.
- Published
- 2016
4. Tracking of Airborne Radionuclides from the Damaged Fukushima Dai-Ichi Nuclear Reactors by European Networks
- Author
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Masson, O., Baeza, A., Bieringer, J., Brudecki, K., Bucci, S., Cappai, M., Carvalho, F.P., Connan, O., Cosma, C., Dalheimer, A., Didier, D., Depuydt, G., De Geer, L.E., De Vismes, A., Gini, L., Groppi, F., Gudnason, K., Gurriaran, R., Hainz, D., Halldórsson, Ó., Hammond, D., Hanley, O., Holeý, K., Homoki, Zs., Ioannidou, A., Isajenko, K., Jankovic, M., Katzlberger, C., Kettunen, M., Kierepko, R., Kontro, R., Kwakman, P.J.M., Lecomte, M., Leon Vintro, L., Leppänen, A.-P., Lind, B., Lujaniene, G., Mc Ginnity, P., Mahon, C. Mc, Malá, H., Manenti, S., Manolopoulou, M., Mattila, A., Mauring, A., Mietelski, J.W., Møller, B., Nielsen, Sven Poul, Nikolic, J., Overwater, R.M.W., Pálsson, S. E., Papastefanou, C., Penev, I., Pham, M.K., Povinec, P.P., Ramebäck, H., Reis, M.C., Ringer, W., Rodriguez, A., Rulík, P., Saey, P.R.J., Samsonov, V., Schlosser, C., Sgorbati, G., Silobritiene, B. V., Söderström, C., Sogni, R., Solier, L., Sonck, M., Steinhauser, G., Steinkopff, T., Steinmann, P., Stoulos, S., Sýkora, I., Todorovic, D., Tooloutalaie, N., Tositti, L., Tschiersch, J., Ugron, A., Vagena, E., Vargas, A., Wershofen, H., Zhukova, O., Masson, O., Baeza, A., Bieringer, J., Brudecki, K., Bucci, S., Cappai, M., Carvalho, F.P., Connan, O., Cosma, C., Dalheimer, A., Didier, D., Depuydt, G., De Geer, L.E., De Vismes, A., Gini, L., Groppi, F., Gudnason, K., Gurriaran, R., Hainz, D., Halldórsson, Ó., Hammond, D., Hanley, O., Holeý, K., Homoki, Zs., Ioannidou, A., Isajenko, K., Jankovic, M., Katzlberger, C., Kettunen, M., Kierepko, R., Kontro, R., Kwakman, P.J.M., Lecomte, M., Leon Vintro, L., Leppänen, A.-P., Lind, B., Lujaniene, G., Mc Ginnity, P., Mahon, C. Mc, Malá, H., Manenti, S., Manolopoulou, M., Mattila, A., Mauring, A., Mietelski, J.W., Møller, B., Nielsen, Sven Poul, Nikolic, J., Overwater, R.M.W., Pálsson, S. E., Papastefanou, C., Penev, I., Pham, M.K., Povinec, P.P., Ramebäck, H., Reis, M.C., Ringer, W., Rodriguez, A., Rulík, P., Saey, P.R.J., Samsonov, V., Schlosser, C., Sgorbati, G., Silobritiene, B. V., Söderström, C., Sogni, R., Solier, L., Sonck, M., Steinhauser, G., Steinkopff, T., Steinmann, P., Stoulos, S., Sýkora, I., Todorovic, D., Tooloutalaie, N., Tositti, L., Tschiersch, J., Ugron, A., Vagena, E., Vargas, A., Wershofen, H., and Zhukova, O.
- Abstract
Radioactive emissions into the atmosphere from the damaged reactors of the Fukushima Dai-ichi nuclear power plant (NPP) started on March 12th, 2011. Among the various radionuclides released, iodine-131 (131I) and cesium isotopes (137Cs and 134Cs) were transported across the Pacific toward the North American continent and reached Europe despite dispersion and washout along the route of the contaminated air masses. In Europe, the first signs of the releases were detected 7 days later while the first peak of activity level was observed between March 28th and March 30th. Time variations over a 20-day period and spatial variations across more than 150 sampling locations in Europe made it possible to characterize the contaminated air masses. After the Chernobyl accident, only a few measurements of the gaseous 131I fraction were conducted compared to the number of measurements for the particulate fraction. Several studies had already pointed out the importance of the gaseous 131I and the large underestimation of the total 131I airborne activity level, and subsequent calculations of inhalation dose, if neglected. The measurements made across Europe following the releases from the Fukushima NPP reactors have provided a significant amount of new data on the ratio of the gaseous 131I fraction to total 131I, both on a spatial scale and its temporal variation. It can be pointed out that during the Fukushima event, the 134Cs to 137Cs ratio proved to be different from that observed after the Chernobyl accident. The data set provided in this paper is the most comprehensive survey of the main relevant airborne radionuclides from the Fukushima reactors, measured across Europe. A rough estimate of the total 131I inventory that has passed over Europe during this period was
- Published
- 2011
5. Tracking of Airborne Radionuclides from the Damaged Fukushima Dai-Ichi Nuclear Reactors by European Networks
- Author
-
Masson, Olivier, Baeza, A., Bieringer, Jacqueline, Brudecki, K., Bucci, S., Cappai, M., Carvalho, F. P., Connan, O., Cosma, C., Dalheimer, Axel, Didier, D., Depuydt, G., De Geer, L. E., De Vismes, Anne, Gini, L., Groppi, F., Gudnason, K., Gurriaran, R., Hainz, D., Halldorsson, O., Hammond, D., Hanley, O., Holey, K., Homoki, Zsolt, Ioannidou, A., Isajenko, Krzysztof A., Janković, Marija M., Katzlberger, Christian, Kettunen, M., Kierepko, Renata, Kontro, R., Kwakman, P. J. M., Lecomte, M., Vintro, L. Leon, Leppanen, A-P, Lind, B., Lujaniene, G., Mc Ginnity, P., Mc Mahon, C., Mala, Helena, Manenti, S., Manolopoulou, M., Mattila, A., Mauring, A., Mietelski, Jerzy W., Moller, Bredo, Nielsen, S. P., Krneta-Nikolić, Jelena D., Overwater, R. M. W., Palsson, S. E., Papastefanou, C., Penev, I., Pham, M. K., Povinec, Pavel Peter, Rameback, H., Reis, M. C., Ringer, Wolfgang, Rodriguez, A., Rulik, Petr, Saey, P. R. J., Samsonov, V., Schlosser, C., Sgorbati, G., Silobritiene, B. V., Soderstrom, C., Sogni, R., Solier, L., Sonck, M., Steinhauser, Georg, Steinkopff, Thomas, Steinmann, P., Stoulos, S., Sykora, Ivan, Todorović, Dragana, Tooloutalaie, N., Tositti, L., Tschiersch, Jochen, Ugron, A., Vagena, E., Vargas, A., Wershofen, Herbert, Zhukova, O., Masson, Olivier, Baeza, A., Bieringer, Jacqueline, Brudecki, K., Bucci, S., Cappai, M., Carvalho, F. P., Connan, O., Cosma, C., Dalheimer, Axel, Didier, D., Depuydt, G., De Geer, L. E., De Vismes, Anne, Gini, L., Groppi, F., Gudnason, K., Gurriaran, R., Hainz, D., Halldorsson, O., Hammond, D., Hanley, O., Holey, K., Homoki, Zsolt, Ioannidou, A., Isajenko, Krzysztof A., Janković, Marija M., Katzlberger, Christian, Kettunen, M., Kierepko, Renata, Kontro, R., Kwakman, P. J. M., Lecomte, M., Vintro, L. Leon, Leppanen, A-P, Lind, B., Lujaniene, G., Mc Ginnity, P., Mc Mahon, C., Mala, Helena, Manenti, S., Manolopoulou, M., Mattila, A., Mauring, A., Mietelski, Jerzy W., Moller, Bredo, Nielsen, S. P., Krneta-Nikolić, Jelena D., Overwater, R. M. W., Palsson, S. E., Papastefanou, C., Penev, I., Pham, M. K., Povinec, Pavel Peter, Rameback, H., Reis, M. C., Ringer, Wolfgang, Rodriguez, A., Rulik, Petr, Saey, P. R. J., Samsonov, V., Schlosser, C., Sgorbati, G., Silobritiene, B. V., Soderstrom, C., Sogni, R., Solier, L., Sonck, M., Steinhauser, Georg, Steinkopff, Thomas, Steinmann, P., Stoulos, S., Sykora, Ivan, Todorović, Dragana, Tooloutalaie, N., Tositti, L., Tschiersch, Jochen, Ugron, A., Vagena, E., Vargas, A., Wershofen, Herbert, and Zhukova, O.
- Abstract
Radioactive emissions into the atmosphere from the damaged reactors of the Fukushima Dai-ichi nuclear power plant (NPP) started on March 12th, 2011. Among the various radionuclides released, iodine-131 ((131)I) and cesium isotopes ((137)Cs and (134)Cs) were transported across the Pacific toward the North American continent and reached Europe despite dispersion and washout along the route of the contaminated air masses. In Europe, the first signs of the releases were detected 7 days later while the first peak of activity level was observed between March 28th and March 30th. Time variations over a 20-day period and spatial variations across more than 150 sampling locations in Europe made it possible to characterize the contaminated air masses. After the Chernobyl accident, only a few measurements of the gaseous (131)I fraction were conducted compared to the number of measurements for the particulate fraction. Several studies had already pointed out the importance of the gaseous (131)I and the large underestimation of the total (131)I airborne activity level, and subsequent calculations of inhalation dose, if neglected. The measurements made across Europe following the releases from the Fukushima NPP reactors have provided a significant amount of new data on the ratio of the gaseous (131)I fraction to total (131)I, both on a spatial scale and its temporal variation. It can be pointed out that during the Fukushima event, the (134)Cs to (137)Cs ratio proved to be different from that observed after the Chernobyl accident. The data set provided in this paper is the most comprehensive survey of the main relevant airborne radionuclides from the Fukushima reactors, measured across Europe. A rough estimate of the total (131)I inventory that has passed over Europe during this period was LT 1% of the released amount. According to the measurements, airborne activity levels remain of no concern for public health in Europe.
- Published
- 2011
6. An assessment of aquatic radiation pathways in Ireland
- Author
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Currivan, L., primary, Kelleher, K., additional, Hanley, O., additional, McKittrick, L., additional, Clyne, F., additional, and Pollard, D., additional
- Published
- 2011
- Full Text
- View/download PDF
7. Developmental Cajal-Retzius cell death contributes to the maturation of layer 1 cortical inhibition and somatosensory processing.
- Author
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Damilou A, Cai L, Argunşah AÖ, Han S, Kanatouris G, Karatsoli M, Hanley O, Gesuita L, Kollmorgen S, Helmchen F, and Karayannis T
- Subjects
- Animals, Mice, Neocortex cytology, Neocortex physiology, GABAergic Neurons physiology, GABAergic Neurons metabolism, Male, Vibrissae physiology, Female, Mice, Inbred C57BL, Neural Inhibition physiology, Neurons physiology, Neurons metabolism, Cell Death, Somatosensory Cortex physiology, Somatosensory Cortex cytology, Pyramidal Cells physiology, Pyramidal Cells metabolism
- Abstract
The role of developmental cell death in the formation of brain circuits is not well understood. Cajal-Retzius cells constitute a major transient neuronal population in the mammalian neocortex, which largely disappears at the time of postnatal somatosensory maturation. In this study, we used mouse genetics, anatomical, functional, and behavioral approaches to explore the impact of the early postnatal death of Cajal-Retzius cells in the maturation of the cortical circuit. We find that before their death, Cajal-Retzius cells mainly receive inputs from layer 1 neurons, which can only develop their mature connectivity onto layer 2/3 pyramidal cells after Cajal-Retzius cells disappear. This developmental connectivity progression from layer 1 GABAergic to layer 2/3 pyramidal cells regulates sensory-driven inhibition within, and more so, across cortical columns. Here we show that Cajal-Retzius cell death prevention leads to layer 2/3 hyper-excitability, delayed learning and reduced performance in a multi-whisker-dependent texture discrimination task., (© 2024. The Author(s).)
- Published
- 2024
- Full Text
- View/download PDF
8. Postmitotic Prox1 Expression Controls the Final Specification of Cortical VIP Interneuron Subtypes.
- Author
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Stachniak TJ, Kastli R, Hanley O, Argunsah AÖ, van der Valk EGT, Kanatouris G, and Karayannis T
- Subjects
- Animals, Cell Movement, Female, Gene Expression, Homeodomain Proteins genetics, Male, Mice, Nerve Tissue Proteins genetics, Nerve Tissue Proteins metabolism, Signal Transduction physiology, Synapses metabolism, Tumor Suppressor Proteins genetics, Cerebral Cortex metabolism, Homeodomain Proteins metabolism, Interneurons metabolism, Tumor Suppressor Proteins metabolism
- Abstract
Throughout development, neuronal identity is controlled by key transcription factors that determine the unique properties of a cell. During embryogenesis, the transcription factor Prox1 regulates VIP-positive cortical interneuron migration, survival, and connectivity. Here, we explore the role of Prox1 as a regulator of genetic programs that guide the final specification of VIP interneuron subtypes in early postnatal life. Synaptic in vitro electrophysiology in male and female mice shows that postnatal Prox1 removal differentially affects the dynamics of excitatory inputs onto VIP bipolar and multipolar subtypes. RNA sequencing reveals that one of the downstream targets of Prox1 is the postsynaptic protein Elfn1, a constitutive regulator of presynaptic release probability. Further genetic, pharmacological, and electrophysiological experiments demonstrate that removing Prox1 reduces Elfn1 function in VIP multipolar but not in bipolar cells. Finally, overexpression experiments and analysis of native Elfn1 mRNA expression reveal that Elfn1 levels are differentially controlled at the post-transcriptional stage. Thus, in addition to activity-dependent processes that contribute to the developmental trajectory of VIP cells, genetic programs engaged by Prox1 control the final differentiation of multipolar and bipolar subtypes. SIGNIFICANCE STATEMENT The transcription factor Prox1 generates functional diversification of cortical VIP interneuron subtypes in early postnatal life, thus expanding the inhibitory repertoire of the cortex., (Copyright © 2021 Stachniak, Kastli et al.)
- Published
- 2021
- Full Text
- View/download PDF
9. Topoisomerase IIβ Selectively Regulates Motor Neuron Identity and Peripheral Connectivity through Hox/Pbx-Dependent Transcriptional Programs.
- Author
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Edmond M, Hanley O, and Philippidou P
- Subjects
- Animals, Cell Movement physiology, Cell Survival physiology, DNA Topoisomerases, Type II genetics, Female, Green Fluorescent Proteins genetics, Green Fluorescent Proteins metabolism, Male, Mice, Transgenic, Neural Pathways enzymology, Neural Pathways pathology, Neural Stem Cells enzymology, Neural Stem Cells pathology, Neurogenesis physiology, Peripheral Nerves enzymology, Peripheral Nerves growth & development, Peripheral Nerves pathology, Poly-ADP-Ribose Binding Proteins genetics, Spinal Cord enzymology, Spinal Cord growth & development, Spinal Cord pathology, DNA Topoisomerases, Type II deficiency, Homeodomain Proteins metabolism, Motor Neurons enzymology, Motor Neurons pathology, Poly-ADP-Ribose Binding Proteins deficiency
- Abstract
Vital motor functions, such as respiration and locomotion, rely on the ability of spinal motor neurons (MNs) to acquire stereotypical positions in the ventral spinal cord and to project with high precision to their peripheral targets. These key properties of MNs emerge during development through transcriptional programs that dictate their subtype identity and connectivity; however, the molecular mechanisms that establish the transcriptional landscape necessary for MN specification are not fully understood. Here, we show that the enzyme topoisomerase IIβ (Top2β) controls MN migration and connectivity. Surprisingly, Top2β is not required for MN generation or survival but has a selective role in columnar specification. In the absence of Top2β , phrenic MN identity is eroded, while other motor columns are partially preserved but fail to cluster to their proper position. In Top2β -/- mice, peripheral connectivity is impaired as MNs exhibit a profound deficit in terminal branching. These defects likely result from the insufficient activation of Hox/Pbx-dependent transcriptional programs as Hox and Pbx genes are downregulated in the absence of Top2β . Top2β mutants recapitulate many aspects of Pbx mutant mice, such as MN disorganization and defects in medial motor column (MMC) specification. Our findings indicate that Top2β , a gene implicated in neurodevelopmental diseases such as autism spectrum disorders, plays a critical, cell-specific role in the assembly of motor circuits.
- Published
- 2017
- Full Text
- View/download PDF
10. Parallel Pbx-Dependent Pathways Govern the Coalescence and Fate of Motor Columns.
- Author
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Hanley O, Zewdu R, Cohen LJ, Jung H, Lacombe J, Philippidou P, Lee DH, Selleri L, and Dasen JS
- Subjects
- Aldehyde Oxidoreductases metabolism, Animals, Chick Embryo, Forkhead Transcription Factors metabolism, Gene Expression Regulation genetics, Homeodomain Proteins genetics, Mice, Mutation, Pre-B-Cell Leukemia Transcription Factor 1, Proto-Oncogene Proteins genetics, Repressor Proteins metabolism, Spinal Cord metabolism, Spinal Cord physiology, Transcription Factors genetics, Cell Differentiation physiology, Homeodomain Proteins physiology, Motor Neurons physiology, Proto-Oncogene Proteins physiology, Transcription Factors physiology
- Abstract
The clustering of neurons sharing similar functional properties and connectivity is a common organizational feature of vertebrate nervous systems. Within motor networks, spinal motor neurons (MNs) segregate into longitudinally arrayed subtypes, establishing a central somatotopic map of peripheral target innervation. MN organization and connectivity relies on Hox transcription factors expressed along the rostrocaudal axis; however, the developmental mechanisms governing the orderly arrangement of MNs are largely unknown. We show that Pbx genes, which encode Hox cofactors, are essential for the segregation and clustering of neurons within motor columns. In the absence of Pbx1 and Pbx3 function, Hox-dependent programs are lost and the remaining MN subtypes are unclustered and disordered. Identification of Pbx gene targets revealed an unexpected and apparently Hox-independent role in defining molecular features of dorsally projecting medial motor column (MMC) neurons. These results indicate Pbx genes act in parallel genetic pathways to orchestrate neuronal subtype differentiation, connectivity, and organization., (Copyright © 2016 Elsevier Inc. All rights reserved.)
- Published
- 2016
- Full Text
- View/download PDF
11. Evolving Hox activity profiles govern diversity in locomotor systems.
- Author
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Jung H, Mazzoni EO, Soshnikova N, Hanley O, Venkatesh B, Duboule D, and Dasen JS
- Subjects
- Amino Acid Sequence, Animals, Chickens, Forkhead Transcription Factors genetics, Genes, Homeobox genetics, Genetic Variation, Homeodomain Proteins genetics, Lizards, Mice, Molecular Sequence Data, Motor Neurons physiology, Repressor Proteins genetics, Snakes, Vertebrates embryology, Evolution, Molecular, Gene Expression Regulation, Developmental, Genes, Homeobox physiology, Locomotion genetics, Vertebrates genetics, Vertebrates physiology
- Abstract
The emergence of limb-driven locomotor behaviors was a key event in the evolution of vertebrates and fostered the transition from aquatic to terrestrial life. We show that the generation of limb-projecting lateral motor column (LMC) neurons in mice relies on a transcriptional autoregulatory module initiated via transient activity of multiple genes within the HoxA and HoxC clusters. Repression of this module at thoracic levels restricts expression of LMC determinants, thus dictating LMC position relative to the limbs. This suppression is mediated by a key regulatory domain that is specifically found in the Hoxc9 proteins of appendage-bearing vertebrates. The profile of Hoxc9 expression inversely correlates with LMC position in land vertebrates and likely accounts for the absence of LMC neurons in limbless species such as snakes. Thus, modulation of both Hoxc9 protein function and Hoxc9 gene expression likely contributed to evolutionary transitions between undulatory and ambulatory motor circuit connectivity programs., (Copyright © 2014 Elsevier Inc. All rights reserved.)
- Published
- 2014
- Full Text
- View/download PDF
12. Genetic and functional modularity of Hox activities in the specification of limb-innervating motor neurons.
- Author
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Lacombe J, Hanley O, Jung H, Philippidou P, Surmeli G, Grinstein J, and Dasen JS
- Subjects
- Animals, Cell Differentiation, Chick Embryo, DNA-Binding Proteins genetics, Gene Expression Regulation, Developmental, Mice, Mutation, Extremities growth & development, Extremities innervation, Homeodomain Proteins genetics, Homeodomain Proteins metabolism, Motor Neurons cytology, Motor Neurons metabolism, Spinal Cord growth & development, Spinal Cord metabolism, Spinal Cord physiology
- Abstract
A critical step in the assembly of the neural circuits that control tetrapod locomotion is the specification of the lateral motor column (LMC), a diverse motor neuron population targeting limb musculature. Hox6 paralog group genes have been implicated as key determinants of LMC fate at forelimb levels of the spinal cord, through their ability to promote expression of the LMC-restricted genes Foxp1 and Raldh2 and to suppress thoracic fates through exclusion of Hoxc9. The specific roles and mechanisms of Hox6 gene function in LMC neurons, however, are not known. We show that Hox6 genes are critical for diverse facets of LMC identity and define motifs required for their in vivo specificities. Although Hox6 genes are necessary for generating the appropriate number of LMC neurons, they are not absolutely required for the induction of forelimb LMC molecular determinants. In the absence of Hox6 activity, LMC identity appears to be preserved through a diverse array of Hox5-Hox8 paralogs, which are sufficient to reprogram thoracic motor neurons to an LMC fate. In contrast to the apparently permissive Hox inputs to early LMC gene programs, individual Hox genes, such as Hoxc6, have specific roles in promoting motor neuron pool diversity within the LMC. Dissection of motifs required for Hox in vivo specificities reveals that either cross-repressive interactions or cooperativity with Pbx cofactors are sufficient to induce LMC identity, with the N-terminus capable of promoting columnar, but not pool, identity when transferred to a heterologous homeodomain. These results indicate that Hox proteins orchestrate diverse aspects of cell fate specification through both the convergent regulation of gene programs regulated by many paralogs and also more restricted actions encoded through specificity determinants in the N-terminus., Competing Interests: The authors have declared that no competing interests exist.
- Published
- 2013
- Full Text
- View/download PDF
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