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Bedois AMH, Parker HJ, Price AJ, Morrison JA, Bronner ME, Krumlauf R. Sea lamprey enlightens the origin of the coupling of retinoic acid signaling to vertebrate hindbrain segmentation. Nat Commun 2024; 15:1538. [PMID: 38378737 PMCID: PMC10879103 DOI: 10.1038/s41467-024-45911-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2023] [Accepted: 02/06/2024] [Indexed: 02/22/2024] Open
Abstract
Retinoic acid (RA) is involved in antero-posterior patterning of the chordate body axis and, in jawed vertebrates, has been shown to play a major role at multiple levels of the gene regulatory network (GRN) regulating hindbrain segmentation. Knowing when and how RA became coupled to the core hindbrain GRN is important for understanding how ancient signaling pathways and patterning genes can evolve and generate diversity. Hence, we investigated the link between RA signaling and hindbrain segmentation in the sea lamprey Petromyzon marinus, an important jawless vertebrate model providing clues to decipher ancestral vertebrate features. Combining genomics, gene expression, and functional analyses of major components involved in RA synthesis (Aldh1as) and degradation (Cyp26s), we demonstrate that RA signaling is coupled to hindbrain segmentation in lamprey. Thus, the link between RA signaling and hindbrain segmentation is a pan vertebrate feature of the hindbrain and likely evolved at the base of vertebrates.
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Affiliation(s)
- Alice M H Bedois
- Stowers Institute for Medical Research, Kansas City, MO, 64110, USA
| | - Hugo J Parker
- Stowers Institute for Medical Research, Kansas City, MO, 64110, USA
| | - Andrew J Price
- Stowers Institute for Medical Research, Kansas City, MO, 64110, USA
| | - Jason A Morrison
- Stowers Institute for Medical Research, Kansas City, MO, 64110, USA
| | - Marianne E Bronner
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, 91125, USA
| | - Robb Krumlauf
- Stowers Institute for Medical Research, Kansas City, MO, 64110, USA.
- Department of Anatomy and Cell Biology, Kansas University Medical Center, Kansas City, MO, 66160, USA.
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Bedois AMH, Parker HJ, Bronner ME, Krumlauf R. Sea lamprey enlightens the origin of the coupling of retinoic acid signaling to vertebrate hindbrain segmentation. bioRxiv 2023:2023.07.07.548143. [PMID: 37461675 PMCID: PMC10350081 DOI: 10.1101/2023.07.07.548143] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 07/29/2023]
Abstract
Retinoic acid (RA) is involved in antero-posterior patterning of the chordate body axis and, in jawed vertebrates, has been shown to play a major role at multiple levels of the gene regulatory network (GRN) regulating hindbrain segmentation. Knowing when and how RA became coupled to the core hindbrain GRN is important for understanding how ancient signaling pathways and patterning genes can evolve and generate diversity. Hence, we investigated the link between RA signaling and hindbrain segmentation in the sea lamprey Petromyzon marinus, an important jawless vertebrate model providing clues to decipher ancestral vertebrate features. Combining genomics, gene expression, and functional analyses of major components involved in RA synthesis (Aldh1as) and degradation (Cyp26s), we demonstrate that RA signaling is coupled to hindbrain segmentation in lamprey. Thus, the link between RA signaling and hindbrain segmentation is a pan vertebrate feature of the hindbrain and likely evolved at the base of vertebrates.
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Affiliation(s)
- Alice M. H. Bedois
- Stowers Institute for Medical Research, Kansas City, Missouri 64110, USA
| | - Hugo J. Parker
- Stowers Institute for Medical Research, Kansas City, Missouri 64110, USA
| | - Marianne E. Bronner
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, 91125, USA
| | - Robb Krumlauf
- Stowers Institute for Medical Research, Kansas City, Missouri 64110, USA
- Department of Anatomy and Cell Biology, Kansas University Medical Center, Kansas City, Kansas 66160, USA
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3
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Timoshevskaya N, Eşkut KI, Timoshevskiy VA, Robb SMC, Holt C, Hess JE, Parker HJ, Baker CF, Miller AK, Saraceno C, Yandell M, Krumlauf R, Narum SR, Lampman RT, Gemmell NJ, Mountcastle J, Haase B, Balacco JR, Formenti G, Pelan S, Sims Y, Howe K, Fedrigo O, Jarvis ED, Smith JJ. An improved germline genome assembly for the sea lamprey Petromyzon marinus illuminates the evolution of germline-specific chromosomes. Cell Rep 2023; 42:112263. [PMID: 36930644 PMCID: PMC10166183 DOI: 10.1016/j.celrep.2023.112263] [Citation(s) in RCA: 13] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2022] [Revised: 10/17/2022] [Accepted: 02/28/2023] [Indexed: 03/17/2023] Open
Abstract
Programmed DNA loss is a gene silencing mechanism that is employed by several vertebrate and nonvertebrate lineages, including all living jawless vertebrates and songbirds. Reconstructing the evolution of somatically eliminated (germline-specific) sequences in these species has proven challenging due to a high content of repeats and gene duplications in eliminated sequences and a corresponding lack of highly accurate and contiguous assemblies for these regions. Here, we present an improved assembly of the sea lamprey (Petromyzon marinus) genome that was generated using recently standardized methods that increase the contiguity and accuracy of vertebrate genome assemblies. This assembly resolves highly contiguous, somatically retained chromosomes and at least one germline-specific chromosome, permitting new analyses that reconstruct the timing, mode, and repercussions of recruitment of genes to the germline-specific fraction. These analyses reveal major roles of interchromosomal segmental duplication, intrachromosomal duplication, and positive selection for germline functions in the long-term evolution of germline-specific chromosomes.
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Affiliation(s)
| | - Kaan I Eşkut
- Department of Biology, University of Kentucky, Lexington, KY 40506, USA
| | | | - Sofia M C Robb
- Stowers Institute for Medical Research, Kansas City, MO 64110, USA
| | - Carson Holt
- Department of Human Genetics, University of Utah, Salt Lake City, UT 84112, USA
| | - Jon E Hess
- Columbia River Inter-Tribal Fish Commission, Portland, OR 97232, USA
| | - Hugo J Parker
- Stowers Institute for Medical Research, Kansas City, MO 64110, USA
| | - Cindy F Baker
- National Institute of Water and Atmospheric Research Limited (NIWA), Hamilton, Waikato 3261, New Zealand
| | - Allison K Miller
- Department of Anatomy, School of Biomedical Sciences, University of Otago, Dunedin, Otago 9054, New Zealand
| | - Cody Saraceno
- Department of Biology, University of Kentucky, Lexington, KY 40506, USA
| | - Mark Yandell
- Department of Human Genetics, University of Utah, Salt Lake City, UT 84112, USA
| | - Robb Krumlauf
- Stowers Institute for Medical Research, Kansas City, MO 64110, USA; Department of Anatomy & Cell Biology, The University of Kansas School of Medicine, Kansas City, KS 66160, USA
| | - Shawn R Narum
- Columbia River Inter-Tribal Fish Commission, Hagerman, ID 83332, USA
| | - Ralph T Lampman
- Yakama Nation Fisheries Resource Management Program, Pacific Lamprey Project, Toppenish, WA 98948, USA
| | - Neil J Gemmell
- Department of Anatomy, School of Biomedical Sciences, University of Otago, Dunedin, Otago 9054, New Zealand
| | | | - Bettina Haase
- Vertebrate Genome Lab, The Rockefeller University, New York, NY 10065, USA
| | - Jennifer R Balacco
- Vertebrate Genome Lab, The Rockefeller University, New York, NY 10065, USA
| | - Giulio Formenti
- Vertebrate Genome Lab, The Rockefeller University, New York, NY 10065, USA; Laboratory of Neurogenetics of Language, The Rockefeller University, New York, NY 10065, USA
| | - Sarah Pelan
- Tree of Life, Wellcome Sanger Institute, Cambridge CB10 1SA, UK
| | - Ying Sims
- Tree of Life, Wellcome Sanger Institute, Cambridge CB10 1SA, UK
| | - Kerstin Howe
- Tree of Life, Wellcome Sanger Institute, Cambridge CB10 1SA, UK
| | - Olivier Fedrigo
- Vertebrate Genome Lab, The Rockefeller University, New York, NY 10065, USA
| | - Erich D Jarvis
- Vertebrate Genome Lab, The Rockefeller University, New York, NY 10065, USA; Laboratory of Neurogenetics of Language, The Rockefeller University, New York, NY 10065, USA; Howard Hughes Medical Institute, Chevy Chase, MD 20815, USA
| | - Jeramiah J Smith
- Department of Biology, University of Kentucky, Lexington, KY 40506, USA.
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Papadogiannis V, Pennati A, Parker HJ, Rothbächer U, Patthey C, Bronner ME, Shimeld SM. Hmx gene conservation identifies the origin of vertebrate cranial ganglia. Nature 2022; 605:701-705. [PMID: 35585239 DOI: 10.1038/s41586-022-04742-w] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2019] [Accepted: 04/07/2022] [Indexed: 12/30/2022]
Abstract
The evolutionary origin of vertebrates included innovations in sensory processing associated with the acquisition of a predatory lifestyle1. Vertebrates perceive external stimuli through sensory systems serviced by cranial sensory ganglia, whose neurons arise predominantly from cranial placodes; however, the understanding of the evolutionary origin of placodes and cranial sensory ganglia is hampered by the anatomical differences between living lineages and the difficulty in assigning homology between cell types and structures. Here we show that the homeobox transcription factor Hmx is a constitutive component of vertebrate sensory ganglion development and that in the tunicate Ciona intestinalis, Hmx is necessary and sufficient to drive the differentiation programme of bipolar tail neurons, cells previously thought to be homologues of neural crest2,3. Using Ciona and lamprey transgenesis, we demonstrate that a unique, tandemly duplicated enhancer pair regulated Hmx expression in the stem-vertebrate lineage. We also show notably robust vertebrate Hmx enhancer function in Ciona, demonstrating that deep conservation of the upstream regulatory network spans the evolutionary origin of vertebrates. These experiments demonstrate regulatory and functional conservation between Ciona and vertebrate Hmx, and point to bipolar tail neurons as homologues of cranial sensory ganglia.
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Affiliation(s)
- Vasileios Papadogiannis
- Department of Zoology, University of Oxford, Oxford, UK.,Institute of Marine Biology, Biotechnology and Aquaculture, Hellenic Centre for Marine Research, Gournes, Crete, Greece
| | - Alessandro Pennati
- Department of Zoology, University of Oxford, Oxford, UK.,Institute of Zoology and Center of Molecular Biosciences, University of Innsbruck, Innsbruck, Austria
| | - Hugo J Parker
- Stowers Institute for Medical Research, Kansas City, MO, USA
| | - Ute Rothbächer
- Institute of Zoology and Center of Molecular Biosciences, University of Innsbruck, Innsbruck, Austria
| | - Cedric Patthey
- Department of Radiation Sciences, Oncology, Umeå University, Umeå, Sweden
| | - Marianne E Bronner
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, USA
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5
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Parker HJ, De Kumar B, Pushel I, Bronner ME, Krumlauf R. Analysis of lamprey meis genes reveals that conserved inputs from Hox, Meis and Pbx proteins control their expression in the hindbrain and neural tube. Dev Biol 2021; 479:61-76. [PMID: 34310923 DOI: 10.1016/j.ydbio.2021.07.014] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2021] [Revised: 06/10/2021] [Accepted: 07/22/2021] [Indexed: 11/23/2022]
Abstract
Meis genes are known to play important roles in the hindbrain and neural crest cells of jawed vertebrates. To explore the roles of Meis genes in head development during evolution of vertebrates, we have identified four meis genes in the sea lamprey genome and characterized their patterns of expression and regulation, with a focus on the hindbrain and pharynx. Each of the lamprey meis genes displays temporally and spatially dynamic patterns of expression, some of which are coupled to rhombomeric domains in the developing hindbrain and select pharyngeal arches. Studies of Meis loci in mouse and zebrafish have identified enhancers that are bound by Hox and TALE (Meis and Pbx) proteins, implicating these factors in the direct regulation of Meis expression. We examined the lamprey meis loci and identified a series of cis-elements conserved between lamprey and jawed vertebrate meis genes. In transgenic reporter assays we demonstrated that these elements act as neural enhancers in lamprey embryos, directing reporter expression in appropriate domains when compared to expression of their associated endogenous meis gene. Sequence alignments reveal that these conserved elements are in similar relative positions of the meis loci and contain a series of consensus binding motifs for Hox and TALE proteins. This suggests that ancient Hox and TALE-responsive enhancers regulated expression of ancestral vertebrate meis genes in segmental domains in the hindbrain and have been retained in the meis loci during vertebrate evolution. The presence of conserved Meis, Pbx and Hox binding sites in these lamprey enhancers links Hox and TALE factors to regulation of lamprey meis genes in the developing hindbrain, indicating a deep ancestry for these regulatory interactions prior to the divergence of jawed and jawless vertebrates.
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Affiliation(s)
- Hugo J Parker
- Stowers Institute for Medical Research, Kansas City, MO, 64110, USA
| | - Bony De Kumar
- Stowers Institute for Medical Research, Kansas City, MO, 64110, USA
| | - Irina Pushel
- Stowers Institute for Medical Research, Kansas City, MO, 64110, USA
| | - Marianne E Bronner
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, 91125, USA
| | - Robb Krumlauf
- Stowers Institute for Medical Research, Kansas City, MO, 64110, USA; Department of Anatomy and Cell Biology, Kansas University Medical Center, Kansas City, KS, 66160, USA.
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7
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Prummel KD, Hess C, Nieuwenhuize S, Parker HJ, Rogers KW, Kozmikova I, Racioppi C, Brombacher EC, Czarkwiani A, Knapp D, Burger S, Chiavacci E, Shah G, Burger A, Huisken J, Yun MH, Christiaen L, Kozmik Z, Müller P, Bronner M, Krumlauf R, Mosimann C. A conserved regulatory program initiates lateral plate mesoderm emergence across chordates. Nat Commun 2019; 10:3857. [PMID: 31451684 PMCID: PMC6710290 DOI: 10.1038/s41467-019-11561-7] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2019] [Accepted: 07/22/2019] [Indexed: 01/06/2023] Open
Abstract
Cardiovascular lineages develop together with kidney, smooth muscle, and limb connective tissue progenitors from the lateral plate mesoderm (LPM). How the LPM initially emerges and how its downstream fates are molecularly interconnected remain unknown. Here, we isolate a pan-LPM enhancer in the zebrafish-specific draculin (drl) gene that provides specific LPM reporter activity from early gastrulation. In toto live imaging and lineage tracing of drl-based reporters captures the dynamic LPM emergence as lineage-restricted mesendoderm field. The drl pan-LPM enhancer responds to the transcription factors EomesoderminA, FoxH1, and MixL1 that combined with Smad activity drive LPM emergence. We uncover specific activity of zebrafish-derived drl reporters in LPM-corresponding territories of several chordates including chicken, axolotl, lamprey, Ciona, and amphioxus, revealing a universal upstream LPM program. Altogether, our work provides a mechanistic framework for LPM emergence as defined progenitor field, possibly representing an ancient mesodermal cell state that predates the primordial vertebrate embryo. Numerous tissues are derived from the lateral plate mesoderm (LPM) but how this is specified is unclear. Here, the authors identify a pan-LPM reporter activity found in the zebrafish draculin (drl) gene that also shows transgenic activity in LPM-corresponding territories of several chordates, including chicken, axolotl, lamprey, Ciona, and amphioxus.
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Affiliation(s)
- Karin D Prummel
- Institute of Molecular Life Sciences, University of Zurich, Zürich, 8057, Switzerland
| | - Christopher Hess
- Institute of Molecular Life Sciences, University of Zurich, Zürich, 8057, Switzerland
| | - Susan Nieuwenhuize
- Institute of Molecular Life Sciences, University of Zurich, Zürich, 8057, Switzerland
| | - Hugo J Parker
- Department of Anatomy and Cell Biology, Kansas University Medical Center, Kansas City, KS, 66160, USA.,Stowers Institute for Medical Research, Kansas City, MO, 64110, USA
| | - Katherine W Rogers
- Friedrich Miescher Laboratory of the Max Planck Society, Tübingen, 72076, Germany
| | - Iryna Kozmikova
- Institute of Molecular Genetics of the ASCR, Prague, 142 20, Czech Republic
| | - Claudia Racioppi
- Center for Developmental Genetics, Department of Biology, New York University, New York, NY, 10003, USA
| | - Eline C Brombacher
- Institute of Molecular Life Sciences, University of Zurich, Zürich, 8057, Switzerland
| | - Anna Czarkwiani
- TUD-CRTD Center for Regenerative Therapies Dresden, Dresden, 01307, Germany
| | - Dunja Knapp
- TUD-CRTD Center for Regenerative Therapies Dresden, Dresden, 01307, Germany
| | - Sibylle Burger
- Institute of Molecular Life Sciences, University of Zurich, Zürich, 8057, Switzerland
| | - Elena Chiavacci
- Institute of Molecular Life Sciences, University of Zurich, Zürich, 8057, Switzerland
| | - Gopi Shah
- Max Planck Institute of Molecular Cell Biology and Genetics, Dresden, 01307, Germany
| | - Alexa Burger
- Institute of Molecular Life Sciences, University of Zurich, Zürich, 8057, Switzerland
| | - Jan Huisken
- Max Planck Institute of Molecular Cell Biology and Genetics, Dresden, 01307, Germany.,Morgridge Institute for Research, Madison, WI, 53715, USA
| | - Maximina H Yun
- TUD-CRTD Center for Regenerative Therapies Dresden, Dresden, 01307, Germany.,Max Planck Institute of Molecular Cell Biology and Genetics, Dresden, 01307, Germany
| | - Lionel Christiaen
- Center for Developmental Genetics, Department of Biology, New York University, New York, NY, 10003, USA
| | - Zbynek Kozmik
- Institute of Molecular Genetics of the ASCR, Prague, 142 20, Czech Republic
| | - Patrick Müller
- Friedrich Miescher Laboratory of the Max Planck Society, Tübingen, 72076, Germany
| | - Marianne Bronner
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, 91125, USA
| | - Robb Krumlauf
- Department of Anatomy and Cell Biology, Kansas University Medical Center, Kansas City, KS, 66160, USA.,Stowers Institute for Medical Research, Kansas City, MO, 64110, USA
| | - Christian Mosimann
- Institute of Molecular Life Sciences, University of Zurich, Zürich, 8057, Switzerland.
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Parker HJ, Bronner ME, Krumlauf R. An atlas of anterior hox gene expression in the embryonic sea lamprey head: Hox-code evolution in vertebrates. Dev Biol 2019; 453:19-33. [PMID: 31071313 DOI: 10.1016/j.ydbio.2019.05.001] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2019] [Revised: 04/05/2019] [Accepted: 05/01/2019] [Indexed: 10/26/2022]
Abstract
In the hindbrain and the adjacent cranial neural crest (NC) cells of jawed vertebrates (gnathostomes), nested and segmentally-restricted domains of Hox gene expression provide a combinatorial Hox-code for specifying regional properties during head development. Extant jawless vertebrates, such as the sea lamprey (Petromyzon marinus), can provide insights into the evolution and diversification of this Hox-code in vertebrates. There is evidence for gnathostome-like spatial patterns of Hox expression in lamprey; however, the expression domains of the majority of lamprey hox genes from paralogy groups (PG) 1-4 are yet to be characterized, so it is unknown whether they are coupled to hindbrain segments (rhombomeres) and NC. In this study, we systematically describe the spatiotemporal expression of all 14 sea lamprey hox genes from PG1-PG4 in the developing hindbrain and pharynx to investigate the extent to which their expression conforms to the archetypal gnathostome hindbrain and pharyngeal hox-codes. We find many similarities in Hox expression between lamprey and gnathostome species, particularly in rhombomeric domains during hindbrain segmentation and in the cranial neural crest, enabling inference of aspects of Hox expression in the ancestral vertebrate embryonic head. These data are consistent with the idea that a Hox regulatory network underlying hindbrain segmentation is a pan vertebrate trait. We also reveal differences in hindbrain domains at later stages, as well as expression in the endostyle and in pharyngeal arch (PA) 1 mesoderm. Our analysis suggests that many Hox expression domains that are observed in extant gnathostomes were present in ancestral vertebrates but have been partitioned differently across Hox clusters in gnathostome and cyclostome lineages after duplication.
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Affiliation(s)
- Hugo J Parker
- Stowers Institute for Medical Research, Kansas City, MO 64110, USA
| | - Marianne E Bronner
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125, USA
| | - Robb Krumlauf
- Stowers Institute for Medical Research, Kansas City, MO 64110, USA; Department of Anatomy and Cell Biology, Kansas University Medical Center, Kansas City, KS 66160, USA.
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De Kumar B, Parker HJ, Paulson A, Parrish ME, Pushel I, Singh NP, Zhang Y, Slaughter BD, Unruh JR, Florens L, Zeitlinger J, Krumlauf R. HOXA1 and TALE proteins display cross-regulatory interactions and form a combinatorial binding code on HOXA1 targets. Genome Res 2017; 27:1501-1512. [PMID: 28784834 PMCID: PMC5580710 DOI: 10.1101/gr.219386.116] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2016] [Accepted: 07/24/2017] [Indexed: 01/02/2023]
Abstract
Hoxa1 has diverse functional roles in differentiation and development. We identify and characterize properties of regions bound by HOXA1 on a genome-wide basis in differentiating mouse ES cells. HOXA1-bound regions are enriched for clusters of consensus binding motifs for HOX, PBX, and MEIS, and many display co-occupancy of PBX and MEIS. PBX and MEIS are members of the TALE family and genome-wide analysis of multiple TALE members (PBX, MEIS, TGIF, PREP1, and PREP2) shows that nearly all HOXA1 targets display occupancy of one or more TALE members. The combinatorial binding patterns of TALE proteins define distinct classes of HOXA1 targets, which may create functional diversity. Transgenic reporter assays in zebrafish confirm enhancer activities for many HOXA1-bound regions and the importance of HOX-PBX and TGIF motifs for their regulation. Proteomic analyses show that HOXA1 physically interacts on chromatin with PBX, MEIS, and PREP family members, but not with TGIF, suggesting that TGIF may have an independent input into HOXA1-bound regions. Therefore, TALE proteins appear to represent a wide repertoire of HOX cofactors, which may coregulate enhancers through distinct mechanisms. We also discover extensive auto- and cross-regulatory interactions among the Hoxa1 and TALE genes, indicating that the specificity of HOXA1 during development may be regulated though a complex cross-regulatory network of HOXA1 and TALE proteins. This study provides new insight into a regulatory network involving combinatorial interactions between HOXA1 and TALE proteins.
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Affiliation(s)
- Bony De Kumar
- Stowers Institute for Medical Research, Kansas City, Missouri 64110, USA
| | - Hugo J Parker
- Stowers Institute for Medical Research, Kansas City, Missouri 64110, USA
| | - Ariel Paulson
- Stowers Institute for Medical Research, Kansas City, Missouri 64110, USA
| | - Mark E Parrish
- Stowers Institute for Medical Research, Kansas City, Missouri 64110, USA
| | - Irina Pushel
- Stowers Institute for Medical Research, Kansas City, Missouri 64110, USA
| | | | - Ying Zhang
- Stowers Institute for Medical Research, Kansas City, Missouri 64110, USA
| | - Brian D Slaughter
- Stowers Institute for Medical Research, Kansas City, Missouri 64110, USA
| | - Jay R Unruh
- Stowers Institute for Medical Research, Kansas City, Missouri 64110, USA
| | - Laurence Florens
- Stowers Institute for Medical Research, Kansas City, Missouri 64110, USA
| | - Julia Zeitlinger
- Stowers Institute for Medical Research, Kansas City, Missouri 64110, USA.,Department of Pathology
| | - Robb Krumlauf
- Stowers Institute for Medical Research, Kansas City, Missouri 64110, USA.,Department of Anatomy and Cell Biology, Kansas University Medical Center, Kansas City, Kansas 66160, USA
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10
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Parker HJ, Krumlauf R. Segmental arithmetic: summing up the Hox gene regulatory network for hindbrain development in chordates. Wiley Interdiscip Rev Dev Biol 2017; 6. [PMID: 28771970 DOI: 10.1002/wdev.286] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2017] [Revised: 06/13/2017] [Accepted: 06/15/2017] [Indexed: 11/10/2022]
Abstract
Organization and development of the early vertebrate hindbrain are controlled by a cascade of regulatory interactions that govern the process of segmentation and patterning along the anterior-posterior axis via Hox genes. These interactions can be assembled into a gene regulatory network that provides a framework to interpret experimental data, generate hypotheses, and identify gaps in our understanding of the progressive process of hindbrain segmentation. The network can be broadly separated into a series of interconnected programs that govern early signaling, segmental subdivision, secondary signaling, segmentation, and ultimately specification of segmental identity. Hox genes play crucial roles in multiple programs within this network. Furthermore, the network reveals properties and principles that are likely to be general to other complex developmental systems. Data from vertebrate and invertebrate chordate models are shedding light on the origin and diversification of the network. Comprehensive cis-regulatory analyses of vertebrate Hox gene regulation have enabled powerful cross-species gene regulatory comparisons. Such an approach in the sea lamprey has revealed that the network mediating segmental Hox expression was present in ancestral vertebrates and has been maintained across diverse vertebrate lineages. Invertebrate chordates lack hindbrain segmentation but exhibit conservation of some aspects of the network, such as a role for retinoic acid in establishing nested Hox expression domains. These comparisons lead to a model in which early vertebrates underwent an elaboration of the network between anterior-posterior patterning and Hox gene expression, leading to the gene-regulatory programs for segmental subdivision and rhombomeric segmentation. WIREs Dev Biol 2017, 6:e286. doi: 10.1002/wdev.286 For further resources related to this article, please visit the WIREs website.
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Affiliation(s)
- Hugo J Parker
- Stowers Institute for Medical Research, Kansas City, MO, USA
| | - Robb Krumlauf
- Stowers Institute for Medical Research, Kansas City, MO, USA.,Department of Anatomy and Cell Biology, Kansas University Medical Center, Kansas City, Kansas 66160, USA
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11
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Parker HJ, Bronner ME, Krumlauf R. The vertebrate Hox gene regulatory network for hindbrain segmentation: Evolution and diversification: Coupling of a Hox gene regulatory network to hindbrain segmentation is an ancient trait originating at the base of vertebrates. Bioessays 2016; 38:526-38. [PMID: 27027928 DOI: 10.1002/bies.201600010] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Hindbrain development is orchestrated by a vertebrate gene regulatory network that generates segmental patterning along the anterior-posterior axis via Hox genes. Here, we review analyses of vertebrate and invertebrate chordate models that inform upon the evolutionary origin and diversification of this network. Evidence from the sea lamprey reveals that the hindbrain regulatory network generates rhombomeric compartments with segmental Hox expression and an underlying Hox code. We infer that this basal feature was present in ancestral vertebrates and, as an evolutionarily constrained developmental state, is fundamentally important for patterning of the vertebrate hindbrain across diverse lineages. Despite the common ground plan, vertebrates exhibit neuroanatomical diversity in lineage-specific patterns, with different vertebrates revealing variations of Hox expression in the hindbrain that could underlie this diversification. Invertebrate chordates lack hindbrain segmentation but exhibit some conserved aspects of this network, with retinoic acid signaling playing a role in establishing nested domains of Hox expression.
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Affiliation(s)
- Hugo J Parker
- Stowers Institute for Medical Research, Kansas City, MO, USA
| | - Marianne E Bronner
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, USA
| | - Robb Krumlauf
- Stowers Institute for Medical Research, Kansas City, MO, USA.,Department of Anatomy and Cell Biology, Kansas University Medical Center, Kansas City, KS, USA
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Parker HJ, Sauka-Spengler T, Bronner M, Elgar G. A reporter assay in lamprey embryos reveals both functional conservation and elaboration of vertebrate enhancers. PLoS One 2014; 9:e85492. [PMID: 24416417 PMCID: PMC3887057 DOI: 10.1371/journal.pone.0085492] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2013] [Accepted: 12/05/2013] [Indexed: 11/27/2022] Open
Abstract
The sea lamprey is an important model organism for investigating the evolutionary origins of vertebrates. As more vertebrate genome sequences are obtained, evolutionary developmental biologists are becoming increasingly able to identify putative gene regulatory elements across the breadth of the vertebrate taxa. The identification of these regions makes it possible to address how changes at the genomic level have led to changes in developmental gene regulatory networks and ultimately to the evolution of morphological diversity. Comparative genomics approaches using sea lamprey have already predicted a number of such regulatory elements in the lamprey genome. Functional characterisation of these sequences and other similar elements requires efficient reporter assays in lamprey. In this report, we describe the development of a transient transgenesis method for lamprey embryos. Focusing on conserved non-coding elements (CNEs), we use this method to investigate their functional conservation across the vertebrate subphylum. We find instances of both functional conservation and lineage-specific functional evolution of CNEs across vertebrates, emphasising the utility of functionally testing homologous CNEs in their host species.
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Affiliation(s)
- Hugo J. Parker
- Division of Systems Biology, Medical Research Council National Institute for Medical Research, London, United Kingdom
| | - Tatjana Sauka-Spengler
- Division of Biology, California Institute of Technology, Pasadena, California, United States of America
| | - Marianne Bronner
- Division of Biology, California Institute of Technology, Pasadena, California, United States of America
| | - Greg Elgar
- Division of Systems Biology, Medical Research Council National Institute for Medical Research, London, United Kingdom
- * E-mail:
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Parker HJ, Piccinelli P, Sauka-Spengler T, Bronner M, Elgar G. Ancient Pbx-Hox signatures define hundreds of vertebrate developmental enhancers. BMC Genomics 2011; 12:637. [PMID: 22208168 PMCID: PMC3261376 DOI: 10.1186/1471-2164-12-637] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2011] [Accepted: 12/30/2011] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Gene regulation through cis-regulatory elements plays a crucial role in development and disease. A major aim of the post-genomic era is to be able to read the function of cis-regulatory elements through scrutiny of their DNA sequence. Whilst comparative genomics approaches have identified thousands of putative regulatory elements, our knowledge of their mechanism of action is poor and very little progress has been made in systematically de-coding them. RESULTS Here, we identify ancient functional signatures within vertebrate conserved non-coding elements (CNEs) through a combination of phylogenetic footprinting and functional assay, using genomic sequence from the sea lamprey as a reference. We uncover a striking enrichment within vertebrate CNEs for conserved binding-site motifs of the Pbx-Hox hetero-dimer. We further show that these predict reporter gene expression in a segment specific manner in the hindbrain and pharyngeal arches during zebrafish development. CONCLUSIONS These findings evoke an evolutionary scenario in which many CNEs evolved early in the vertebrate lineage to co-ordinate Hox-dependent gene-regulatory interactions that pattern the vertebrate head. In a broader context, our evolutionary analyses reveal that CNEs are composed of tightly linked transcription-factor binding-sites (TFBSs), which can be systematically identified through phylogenetic footprinting approaches. By placing a large number of ancient vertebrate CNEs into a developmental context, our findings promise to have a significant impact on efforts toward de-coding gene-regulatory elements that underlie vertebrate development, and will facilitate building general models of regulatory element evolution.
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Affiliation(s)
- Hugo J Parker
- Division of Systems Biology, MRC National Institute for Medical Research, The Ridgeway, Mill Hill, London NW7 1AA, UK
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McEwen GK, Goode DK, Parker HJ, Woolfe A, Callaway H, Elgar G. Early evolution of conserved regulatory sequences associated with development in vertebrates. PLoS Genet 2009; 5:e1000762. [PMID: 20011110 PMCID: PMC2781166 DOI: 10.1371/journal.pgen.1000762] [Citation(s) in RCA: 80] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2009] [Accepted: 11/10/2009] [Indexed: 01/22/2023] Open
Abstract
Comparisons between diverse vertebrate genomes have uncovered thousands of highly conserved non-coding sequences, an increasing number of which have been shown to function as enhancers during early development. Despite their extreme conservation over 500 million years from humans to cartilaginous fish, these elements appear to be largely absent in invertebrates, and, to date, there has been little understanding of their mode of action or the evolutionary processes that have modelled them. We have now exploited emerging genomic sequence data for the sea lamprey, Petromyzon marinus, to explore the depth of conservation of this type of element in the earliest diverging extant vertebrate lineage, the jawless fish (agnathans). We searched for conserved non-coding elements (CNEs) at 13 human gene loci and identified lamprey elements associated with all but two of these gene regions. Although markedly shorter and less well conserved than within jawed vertebrates, identified lamprey CNEs are able to drive specific patterns of expression in zebrafish embryos, which are almost identical to those driven by the equivalent human elements. These CNEs are therefore a unique and defining characteristic of all vertebrates. Furthermore, alignment of lamprey and other vertebrate CNEs should permit the identification of persistent sequence signatures that are responsible for common patterns of expression and contribute to the elucidation of the regulatory language in CNEs. Identifying the core regulatory code for development, common to all vertebrates, provides a foundation upon which regulatory networks can be constructed and might also illuminate how large conserved regulatory sequence blocks evolve and become fixed in genomic DNA. Recent comparative analyses of vertebrate genomes has resulted in the identification of highly conserved non-coding sequences near genes that coordinate early development. Many of these sequences can activate gene expression and are thought to be important regulatory elements. Surprisingly, a large set of these long, near-identical sequences is found in every jawed vertebrate, including sharks, yet almost completely absent in non-vertebrates. This study looks for this set of sequences in the lamprey, a representative of our most distant vertebrate relatives, in order to determine when and how such a large set of important non-coding regulatory sequences became established in the genome. Although the lamprey divergence is only a little older than the divergence of cartilaginous fish (including sharks), relatively few, and considerably shorter, conserved non-coding sequences are identifiable. Nevertheless, these shorter lamprey sequences are capable of driving gene expression in a precise spatial pattern in zebrafish embryos in the same way as the equivalent human elements. This analysis has shed light on the emergence of these regulatory sequences during early vertebrate evolution, at a time of whole-genome duplications and considerable morphological variation, consistent with a role for these sequences in directing gene regulatory networks for vertebrate development.
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Affiliation(s)
- Gayle K. McEwen
- School of Biological and Chemical Sciences, Queen Mary University of London, London, United Kingdom
| | - Debbie K. Goode
- School of Biological and Chemical Sciences, Queen Mary University of London, London, United Kingdom
| | - Hugo J. Parker
- School of Biological and Chemical Sciences, Queen Mary University of London, London, United Kingdom
| | - Adam Woolfe
- School of Biological and Chemical Sciences, Queen Mary University of London, London, United Kingdom
| | - Heather Callaway
- School of Biological and Chemical Sciences, Queen Mary University of London, London, United Kingdom
| | - Greg Elgar
- School of Biological and Chemical Sciences, Queen Mary University of London, London, United Kingdom
- * E-mail:
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Schuster-Gossler K, Lee AW, Lerner CP, Parker HJ, Dyer VW, Scott VE, Gossler A, Conover JC. Use of coisogenic host blastocysts for efficient establishment of germline chimeras with C57BL/6J ES cell lines. Biotechniques 2001; 31:1022-4, 1026. [PMID: 11730008 DOI: 10.2144/01315st01] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Gene targeting in embryonic stem (ES) cells allows the production of mice with specified genetic mutations. Currently, germline-competent ES cell lines are available from only a limited number of mouse strains, and inappropriate ES cell/host blastocyst combinations often restrict the efficient production of gene-targeted mice. Here, we describe the derivation of C57BL/6J (B6) ES lines and compare the effectiveness of two host blastocyst donors, FVB/NJ (FVB) and the coisogenic strain C57BL/6-Tyr(c)-2J (c2J), for the production of germline chimeras. We found that when B6 ES cells were injected into c2J host blastocysts, a high rate of coat-color chimerism was detected, and germline transmission could be obtained with few blastocyst injections. In all but one case, highly chimeric mice transmitted to 100% of their offspring. The injection of B6 ES cells into FVB blastocysts produced some chimeric mice. However; the proportion of coat-color chimerism was low, with many more blastocyst injections required to generate chimeras capable of germline transmission. Our data support the use of the coisogenic albino host strain, c2J, for the generation of germline-competent chimeric mice when using B6 ES cells.
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Brodfuehrer PD, Parker HJ, Burns A, Berg M. Regulation of the segmental swim-generating system by a pair of identified interneurons in the leech head ganglion. J Neurophysiol 1995; 73:983-92. [PMID: 7608783 DOI: 10.1152/jn.1995.73.3.983] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
1. The aim of this study was to identify neurons that modulate activity of segmental swim gating interneurons. We found a pair of bilaterally symmetrical interneurons, cells SE1, whose activity level directly influences three groups of segmental neurons associated with generating swimming in the medicinal leech. 2. The somata of cells SE1 are located on the dorsal surface of the subesophageal ganglion. Their axons extend most, if not the entire, length of the ventral nerve cord and appear to make identical connections with the same group of swim-generating neurons in all segmental ganglia. 3. Cells SE1 excite monosynaptically all segmental swim gating interneurons, cells 204, examined. The level of excitation in cell 204 is directly correlated with the firing frequency of cell SE1. In most quiescent preparations (when the preparation is not swimming) hyperpolarization of a single cell SE1 eliminates all excitatory synaptic input to cells 204. 4. Cells SE1 excite monosynaptically three swim oscillatory interneurons, cells 115, 28, and 208. The strength of the connection from cell SE1 to cell 115 is stronger than the connection from cell SE1 to either cells 28 or 208. The level of excitation in cell 115 is directly correlated with the firing frequency of cell SE1. In most quiescent preparations, hyperpolarization of a single cell SE1 eliminates all excitatory synaptic input to cell 115 but has only a minor effect on the level of activity in cells 208 and 28. 5. Due most likely to the strong and direct connections cells SE1 have with swim gating and oscillatory interneurons, brief stimulation of cell SE1 can elicit swimming. Swimming generally occurs within 1 s after stimulation of cell SE1. During swimming, the membrane potential of cell SE1 depolarizes by 2-5 mV, and its firing frequency increases. Brief depolarization of cell SE1 during swimming reliably shifts the phase of the swimming rhythm, whereas longer periods of depolarization increase both swim period and burst duration. 6. Excitatory motor neurons to the dorsal longitudinal muscles, cells 3, 5, and 7, are strongly excited by stimulation of cell SE1. The firing frequency of cell 3 is positively correlated with the firing frequency of cell SE1. 7. The results of this study indicate that cells SE1 can modulate the level of excitation in three groups of neurons associated with generating leech swimming.(ABSTRACT TRUNCATED AT 400 WORDS)
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Affiliation(s)
- P D Brodfuehrer
- Department of Biology, Bryn Mawr College, Pennsylvania 19010, USA
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Glazer H, Parker HJ, Rasberry JL, Buentello J, De Vaney A, Goodman MS, Hucks LH, Lee C, Chan F. Perceived prestige and health careers recruitment. J Healthc Educ Train 1993; 8:13-7. [PMID: 10140183] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
Abstract
Perceived occupational prestige is an important factor in career choice. The purpose of this study was to obtain prestige ratings of 13 allied health occupations and 13 general occupations for high school students, community college students (nonhealth majors), and community college health occupations students. The obtained ratings were compared with ratings of a combined group of health care providers. There was little agreement among the groups as to level of prestige. The high school rankings were the most disparate. Career exploration and outreach programs as part of recruitment efforts by health care institutions are suggested.
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Glazer-Waldman HR, Parker HJ, Chan F. Prestige: radiologic technologists rate themselves and other allied health professionals. Radiol Technol 1989; 60:419-23. [PMID: 2734437] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
This study investigated radiologic technologists' (RTs) prestige ratings of 13 allied health professions and 13 general occupations selected from the original National Opinion Research Center (NORC) list. RTs ranked themselves fifth and on the whole tended to elevate the ratings of the allied health professions. There was a high degree of agreement between RTs' ratings and the NORC occupations data. Implications for the RT profession and for future research are noted.
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Affiliation(s)
- H R Glazer-Waldman
- Department of Allied Health Education, UT Southwestern Medical Center, Dallas 75235-9089
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19
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Parker HJ, Fell G, Devine TJ, King RB. Femoropopliteal bypass using autogenous vein and modified human umbilical vein. A comparative study. J Cardiovasc Surg (Torino) 1988; 29:727-32. [PMID: 3209617] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
This study is based on 223 consecutive femoro-popliteal and femorotibial bypass grafts performed between January 1978 and June 1985 at the Western General Hospital. Autogenous vein grafts demonstrated better 5 year patency rates (54%) than modified human umbilical vein (32%). The superiority of autogenous vein was even more marked when anastomoses were to below knee vessels: 56% compared with 26% at 5 years. Grafts anastomosed to the superficial femoral artery had similar long term patency to those anastomosed to the common femoral artery. When grafts were required for severe ischaemia, similar 5 year patency rates were achieved with autogenous vein (35%) and modified human umbilical vein (30%). The 5 year limb salvage rate in severe ischaemia was 72% for autogenous vein and 63% for modified human umbilical vein. The findings confirm that modified human umbilical vein is a satisfactory alternative when autogenous vein is not available.
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Affiliation(s)
- H J Parker
- Western General Hospital Vascular Unit, Melbourne, Australia
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20
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Chan F, Hedl JJ, Parker HJ, Lam CS, Chan TN, Yu B. Differential attitudes of Chinese students toward people with disabilities: a cross-cultural perspective. Int J Soc Psychiatry 1988; 34:267-73. [PMID: 2976747 DOI: 10.1177/002076408803400404] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
The purpose of this study was to examine the attitudes of 338 Chinese secondary school students toward three major disability groups (people who are physically disabled, emotionally disturbed, and mentally retarded) using an adaptation of the American Scale of Attitudes toward Disabled Persons (SADP). We found that physically disabled persons were rated higher across the three subscales of the SADP compared to either emotionally disturbed and mentally retarded individuals, who were rated similarly low by the students. The lack of differentiation between the two mental handicapping conditions is at variance with contemporary western findings. The overall negative attitudes toward people with mental disabilities may have significant implications for community rehabilitation programming for this population.
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Affiliation(s)
- F Chan
- Department of Psychology, Illinois Institute of Technology, Chicago 60616
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Harig JM, Fumo DE, Loo FD, Parker HJ, Soergel KH, Helm JF, Hogan WJ. Treatment of acute nontoxic megacolon during colonoscopy: tube placement versus simple decompression. Gastrointest Endosc 1988; 34:23-7. [PMID: 3350299 DOI: 10.1016/s0016-5107(88)71224-9] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
The study compares the efficacy of colonoscopic decompression versus decompression and tube placement in the treatment of Ogilvie's syndrome. Nine patients were treated with a single colonoscopic decompression which resulted in four recurrences. In contrast, there were no recurrences observed in 11 patients who underwent decompression and subsequent tube placement (p less than 0.05). There was no morbidity observed from either decompression or tube placement. Tube placement added less than 10 min of additional procedure time to the colonoscopy. The tube utilized in this study was an enteroclysis tube with sideholes cut in the distal 20 cm. The tube was easily inserted over a Teflon-coated flexible guide wire inserted through the colonoscope into the cecum following decompression. This study demonstrates that colonoscopic decompression followed by tube placement is the preferred treatment modality for acute nontoxic megacolon.
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Affiliation(s)
- J M Harig
- Gastroenterology Section, Medical College of Wisconsin, St. Joseph's Hospital, Milwaukee
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22
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Glazer-Waldman HR, Parker HJ, Chan F. Health care educator's perception of the prestige of allied health occupations. J Healthc Educ Train 1987; 3:14-8. [PMID: 10293022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/12/2023]
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23
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Parker HJ, Chan F. Prestige ratings of allied health professions. Tex Med 1987; 83:49-52. [PMID: 3616956] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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Abstract
Physical therapists (n = 53) and occupational therapists (n = 53) appraised themselves and each other by selecting personal and job-based adjectives (54 pairs) on the Health Team Stereotype Scale. The PTs' self-appraisal differed statistically from the OTs' perception of PTs on 31 adjective pairs (57%). The OTs judged PTs as having fewer of the qualities PTs professed on 16 pairs. On 15 pairs, the OTs chose negative adjectives, whereas the PTs chose the positive. The OTs' self-assessment differed statistically from the PTs' perception of OTs on 24 pairs. The PTs perceived OTs as having fewer of the positive adjectives than did the OTs. The PTs' and OTs' self-assessments differed statistically on pairs such as Strong-Weak, Intelligent-Unintelligent, and Aggressive-Passive, with the PTs' mean scores being higher than the OTs'. Overall, the PTs' self-appraisal mean scores were higher than the OTs'. The extent of differences perceived by another profession may explain team conflict or team effectiveness.
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Parker HJ, Chan F. Prestige of radiologic technologists: perception of two allied health professions. Radiol Technol 1985; 57:152-6. [PMID: 4070614] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Physical and Occupational Therapists in large urban hospitals rated the prestige of 13 allied health professions, generally hospital based. Radiologic Technologist was ranked 13th by PTs and 12th by OTs. PTs were more negative with 35% using ratings below "average," while OTs assigned 28%. Only 27% of the PTs used ratings above "average," while 33% of the OTs did so. Prestige scores derived for Radiologic Technologists placed them among nonprofessionals.
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Parker HJ, Delahunt JC. Delegating tasks to physicians' assistants: physicians' reactions. Tex Med 1972; 68:69-79. [PMID: 4404091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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Parker HJ, Sternlof RE, McCoy JF. Objective versus individual mental ability tests with former Head Start children in the first grade. Percept Mot Skills 1971; 32:287-92. [PMID: 4926723 DOI: 10.2466/pms.1971.32.1.287] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
To determine if individual or objective mental ability tests provide more accurate information with culturally deprived children when they reach primary grades, the SRA PMA Test K-1 was administered in the first grade to 62 former Head Start white and Negro boys and girls. The Columbia Mental Maturity Scale, Goodenough Draw-A-Man Test, and Vineland Maturity Scale were administered 6 mo. earlier. On the PMA, significant differences were found for Verbal Meaning, Number Facility, and Total Score for the 4 groups, with scores for whites higher than for Negroes. White boys exceeded girls on all subtests, while Negro boys exceeded Negro girls except on Total Score. Perceptual Speed scores were elevated beyond other scores for all but white girls. Whites exceeded Negroes by an average of 9 mo. on the Primary Mental Abilities, while on the Columbia Mental Maturity Scale the difference was 13 mo. Subject to the users' understanding of the PMA, it appears to be reasonably applicable for use with ethnic and culturally deprived groups in primary grades and could serve as an alternative to individual mental ability testing.
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Parker HJ. Change and advancement for radiologic technologists: the importance of being earnest. Radiol Technol 1970; 42:133-7. [PMID: 5475012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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Bates GL, Parker HJ, McCoy JF. Vocational rehabilitants' personality and work adjustment: a test of Holland's theory of vocational choice. Psychol Rep 1970; 26:511-6. [PMID: 4249663 DOI: 10.2466/pr0.1970.26.2.511] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
This study tested 3 hypotheses derived from Holland's theory of vocational choice: relations between levels of Holland's hypothesized personality dimensions for person-environment interactions (congruency, consistency, and homogeneity) and two work adjustment variables (satisfaction and satisfactoriness) from the Minnesota Studies in Vocational Rehabilitation. 124 male Ss and 76 female Ss, classified as having psychological or physical disabilities, were administered the Holland Vocational Preference Inventory (VPI) and the short-form Minnesota Satisfaction Questionnaire (MSQ). Their employers completed the short-form Minnesota Satisfactoriness Scale (MSS). Levels of congruency, consistency, and homogeneity derived from the VPI were hypothesized to be related to levels of the MSQ and MSS scores. No over-all confirmation was found for the hypotheses; however, some encouragement for further exploration of the efficacy of Holland's personality dimensions was indicated. Significant relationships, involving the answers to questionnaire items of the responders to requests for participation in the study, are reported and discussed.
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Sternlof RE, Parker HJ, McCoy JF. Relationships between the Goodenough DAM Test and the Columbia Mental Maturity Test for Negro and white Headstart children. Percept Mot Skills 1968; 27:424-6. [PMID: 4882925 DOI: 10.2466/pms.1968.27.2.424] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
The Colulmbia Mental Maturity Scale showed significantly lower intellectual functioning in deprived Negro children than in similarly deprived white children. Both Negro and white children scored significantly below their chronological ages on the Goodenough Draw-A-Man Test. No group differences were found on the Vineland Social Maturity Scale, and results were congruent with their chronological ages. Caution in the use of these tests with deprived children is suggested.
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Parker HJ, McCoy JF, Lynn TN. Use of an agency referred population in undergraduate medical teaching. South Med J 1968; 61:491-6. [PMID: 5648695 DOI: 10.1097/00007611-196805000-00010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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