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Topic: Homeosis

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Hox genes

	Homeosis - Wikipedia, the free encyclopedia
		Homeosis is the transformation of one body part into another, arising from mutation in or misexpression of specific developmentally critical genes.
		It may be caused by mutations in Hox genes, found in animals, or others such as the MADS Box family in plants.
		Homeosis is a characteristic that has helped insects become as successful and diverse as they are.
	en.wikipedia.org /wiki/Homeosis (91 words)

	Special: DNA unraveled (Site not responding. Last check: 2007-09-17)
		In 1923, Morgan discovered that homeosis is inherited, and that whatever is responsible for such inheritance resides in the fly's third chromosome.
		But despite much interest in homeosis in the ensuing decades, nearly 50 more years had to pass before Lewis' work led to the discovery of a complex of Drosophila genes whose role in development is to define the appendages that characterize each of the three segments that make up the thorax.
		At about the time that Lewis was defining the genes involved in homeosis in the fly, Nüsslein-Volhard and her colleague Wieschaus were carrying out an extensive search for other genes that affected body pattern.
	www.columbia.edu /cu/21stC/issue-1.3/dna-homeo.html (1066 words)

	Reverse homeosis in homeotically reconstructed ribbonworms -- Tarpin et al. 96 (21): 11900 -- Proceedings of the ...
		Reverse homeosis in homeotically reconstructed ribbonworms -- Tarpin et al.
		Homeosis is the replacement of one body part by another, which may be caused by either developmental or genetic variations.
		This reverse homeosis involves the elimination of the syngeneic
	www.pnas.org /cgi/content/full/96/21/11900 (2499 words)

	SICB - 2002 meeting - Abstract Details (Site not responding. Last check: 2007-09-17)
		Beginning with William Bateson's (1894) coining of the term 'homeosis', I trace significant events in the history of this concept throughout the twentieth century.
		In the latter regard, homeosis has almost always been associated with saltationism; a recent exemplar of this perspective is Jeffrey Schwartz's (1999) work on changes in the timing of homeotic gene expression as the basis for the generation of new animal species.
		I then discuss some skeptical considerations about the roles of homeosis and saltation in animal evolution (particularly those of Akam 1998 and Budd 1999), but leave open the possibility that evolutionary change need not be gradual.
	www.sicb.org /meetings/2003/schedule/abstractdetails.php3?id=102 (264 words)

	Rediscovering Biology - Online Textbook: Unit 7 Genetics of Development
		These mutant genes became referred to collectively as homeotic genes, named after homeosis.
		Homeosis, a term coined by William Bateson (a prominent zoologist and one of the early geneticists), refers to "cases in which structures belonging to one body segment were transformed in identity to those belonging to another segment
		Mutants in these genes appeared to change the characteristics of one segment of the fly into those of another segment.
	www.learner.org /channel/courses/biology/textbook/gendev/gendev_6.html (528 words)

	MedFriendly.com: Homeosis (Site not responding. Last check: 2007-09-17)
		Homeosis means formation of a body part having features that are normally found in a related or similar part at another location in the body.
		Homeosis comes from the Greek word "homoios" meaning "similar," and the Greek word "osis" meaning "condition." Put the words together and you get "similar condition."
		You may not reprint or redisplay this material for commercial use without the express written consent of MedFriendly.com.
	www.medfriendly.com /homeosis.html (108 words)

	Wing-to-Leg Homeosis by Spineless Causes Apoptosis Regulated by Fish-lips, a Novel Leucine-Rich Repeat Transmembrane ...
		Wing-to-Leg Homeosis by Spineless Causes Apoptosis Regulated by Fish-lips, a Novel Leucine-Rich Repeat Transmembrane Protein
		antenna homeosis that subsequently elicits apoptosis in an autonomous
		Homeosis is a naturally occurring rare phenomenon with formation
	mcb.asm.org /cgi/content/full/25/8/3140 (7144 words)

	Study of Homeosis in the Flower of Philodendron (Araceae): a Qualitative and Quantitative Approach -- BARABÉ et ...
		Study of Homeosis in the Flower of Philodendron (Araceae): a Qualitative and Quantitative Approach -- BARABÉ et al.
		Barabé D, Lacroix C. Homeosis, morphogenetic gradient and the determination of floral identity in the inflorescences of Philodendron solimoesense (Araceae).
		Barabé D, Lacroix C. Homeosis in the flower of the Araceae: the case of Philodendron melinonii (Araceae).
	aob.oxfordjournals.org /cgi/content/full/90/5/579 (5160 words)

	Int. J. Dev. Biol. - Hox genes, homeosis and the evolution of segment identity: no need for hopeless monsters.
		Hox genes, homeosis and the evolution of segment identity: no need for hopeless monsters.
		ABSTRACT Significant changes have occurred in the developmental role of Hox genes, even within groups of arthropods that already have complex body plans and many different segment types.
		The summation of such changes over long periods of time would result in differences in Hox gene function between taxa comparable to the effects of gross homeotic mutations, without the need to invoke the selective advantage of hopeful monsters.
	www.ijdb.ehu.es /web/paper.php?doi=9654030 (234 words)

	L.E. Gilbert - Heliconius Wing Pattern Evolution
		Although D/V homeosis is not known in Drosophila (making the hypothesis of D/V compartments suspect), it has been diagnosed in butterflies such as lycaenids in which scale types can differ strikingly between dorsal and ventral FW surfaces (Sibatani 1980).
		My observations of spontaneous homeosis in Heliconius (Gilbert in prep.) demonstrates cell autonomous differentiation of scales with respect to scale type and color (e.g., Figure 3a).
		Likewise experimental induction of somatic mutations in Heliconius embryos which generally reflect phenomena known from clonal analysis of Drosophila imaginal discs (Nöthiger 1981), also indicate cell autonomous differentiation of scale types and suggest that determination of some major pattern boundaries on the wing may occur very early in development (e.g., Figure 3b).
	uts.cc.utexas.edu /~gilbert/research/wingpattern/genes.html (605 words)

	NOBEL PRIZE FOR GENETICS OF DEVELOPMENT (Site not responding. Last check: 2007-09-17)
		It is likely that mutations in such important genes are responsible for some of the early, spontaneous abortions that occur in man, and for some of the about 40 percent of the congenital malformations that develop due to unknown reasons,'' according to a statement from Sweden's Karolinska Institute.
		In this type of bizarre disturbance of the body plan, cells in one region behave as though they were located in another.
		The Greek word homeosis was used to describe this type of malformations and the mutations were referred to as homeotic mutations.
	www.accessexcellence.org /WN/SUA06/aenobmed.html (1869 words)

	HoxD cluster scanning deletions identify multiple defects leading to paralysis in the mouse mutant Ironside -- Tarchini ...
		Homeosis is first seen caudally, suggesting a duplicated 24th
		(A,B) The lumbar homeosis observed in the Del(9) allele (Fig.
		Conversely, posterior homeosis induced by the Hoxd11 lumbar
	www.genesdev.org /cgi/content/full/19/23/2862 (8111 words)

	Kaufman Lab Page (Site not responding. Last check: 2007-09-17)
		Homeotic Complex (Hox) gene regulation and homeosis in the mesoderm of the Drosophila melanogaster embryo: the roles of signal transduction and cell autonomous regulation.
		In this paper we evaluate homeosis and Homeotic Complex (Hox) regulatory hierarchies in the somatic and visceral mesoderm.
		We demonstrate that both Hox control of signal transduction and cell autonomous regulation are critical for establishing normal Hox expression patterns and the specification of segmental identity and morphology.
	www.bio.indiana.edu /~kaufmanlab/papers/papersdros.html (6621 words)

	DEMASON, DARLEEN A.* AND PHILIP J. VILLANI. (Site not responding. Last check: 2007-09-17)
		Several pea (Pisum sativum L.) leaf mutants, including afila (af) and tendrilless (tl) have been cited as classic examples of homeosis in plants.
		An important role of Afand Tl is to control the timing of developmental events during both shoot and leaf ontogeny.
		The results do not support the hypothesis that these pea mutants satisfy the classic definition of homeosis.
	www.ou.edu /cas/botany-micro/bsa-abst/sympos2/abstracts/1.shtml (305 words)

	[No title]
		The second subcategory is peramorphosis, which refers to increased rate of development leading to overextension of development beyond ancestors.
		Homeosis refers to the evolution that alters the placement of body parts.
		This type of evolution involves homeotic genes, which are highly conserved throughout the history of speciation.
	eee.uci.edu /programs/biotutor/94/sheila/midterm194ans.doc (1793 words)

	Lepidopterology.com \| Almanac \| Misc \| Homeosis in Mylothris sulphurea
		It will immediately be seen that the hindwing has been imprinted with the entire pattern of the forewing.
		This very rare phenomenon is known as homeosis.
		It is the finest example I have seen during forty years of studying African butterflies.
	www.lepidopterology.com /almanac/sulphurea_ab.htm (85 words)

	Imaginal Discs: The Genetic and Cellular Logic of Pattern Formation by Lewis I. Held, Jr.
		The implication is that antennal identity is encoded by the Hth-Dll overlap, which leg discs lack (until late 3rd instar) [4760].
		The logic is summarized in the circuit diagram (cf.
		The final stage of development involves creating patterns of small cuticular elements (e.g., bristles and sensilla, rendered abstractly here).
	www.sdbonline.org /fly/lewheld/id83.htm (664 words)

	type_Document_Title_here
		It is responsible for both inter- and intraspecific morphological differences.
		Other causes include heterotopy, the change of structural position, and homeosis, the replacement of a structure by another.
		This paper discusses and reviews the role of heterochrony in plant evolution at the organismal, organ, tissue, cellular and molecular levels, as well as the relationships among heterochrony, heterotopy and homeosis.
	www.nybg.org /bsci/spub/botr/br661.htm (1015 words)

	Knowledge Representation in the Genome: New Genes, Exons, and Pleiotropy
		The genome may therefore come to possess sources of low-pleiotropy variation, e.g., exons corresponding to protein structural and functional units.
		Predictions applying to homeosis, genetic correlation of characters, and functional morphology are discussed.
		Given at the annual meeting of the Genetics Society of America, Boston University, 1985
	dynamics.org /Altenberg/PAPERS/KRG (2216 words)

	New Scientist Premium- The power behind the flower: What makes a plant flower? The event that poets down the ages have ...
		He was also an enthusiastic botanist who for much of his life was fascinated with shape and form.
		Thus was born the phenomenon known to biologists as 'homeosis', the rare tendency of a plant organ or the limb of an animal to adopt the character of a quite different organ or limb during development.
		To continue reading this article, subscribe to New Scientist.
	www.newscientist.com /article/mg13418184.700.html (272 words)

	PMID: 2896123 (Site not responding. Last check: 2007-09-17)
		It appears that the initial patterns of Antp and Abd-B expression involve their differential regulation by a common set of gap genes.
		We propose that the gap genes are largely responsible for integrating the processes of segmentation and homeosis.
		The full text of this article may be accessible through PubMed at:
	lethargy.swmed.edu /cgi-bin/etblast/abstract_local?pmid=2896123&user_id=1015616829&application=0 (170 words)

	Genetics--Human Body lesson plan (grades 6-8)--DiscoverySchool.com (Site not responding. Last check: 2007-09-17)
		Definition: Relating to a gene producing a major shift in structural development in which one part of the body is replaced with another.
		Context: He named these transformations homeosis, a replacement of one part of the body with another.
		Definition: Two persons closely resembling each other who were produced from the same fertilized egg.
	school.discovery.com /lessonplans/programs/genetics (1601 words)

	Developmental basis of homeosis in precociously germinating Brassica napus embryos: phase change at the shoot apex -- ...
		Developmental basis of homeosis in precociously germinating Brassica napus embryos: phase change at the shoot apex -- Fernandez 124 (6): 1149 -- Development
		Articles by Fernandez, D. Development, Vol 124, Issue 6 1149-1157, Copyright © 1997 by Company of Biologists
		Developmental basis of homeosis in precociously germinating Brassica napus embryos: phase change at the shoot apex
	dev.biologists.org /cgi/content/abstract/124/6/1149 (477 words)

	Harvard University - Dept. of Organismic and Evolutionary Biology - Kramer Lab - Dr. Elena Kramer
		Similarly, a lineage possessing petals could give rise to one without and, perhaps more importantly, vice versa.
		This “sliding boundary” model represents a conflict between the Darwinian gradualism embraced by traditional botanical studies and our modern understanding of the power of homeosis to radically alter morphology (Kramer and Irish, 2000; Kramer et al., 2003).
		Moreover, it suggests that although the differences among types of petaloid organs seem to indicate that they are independently derived, the pattern could be the product of a commonly inherited but differentially expressed petal identity program.
	www.oeb.harvard.edu /faculty/kramer/Elena_Kramer/Elena_Kramer.htm (853 words)

	Untitled Document
		The very existence of master control genes has recently been called into question.
		Of the seven Drosophila genes that were originally considered “Master Control Genes” for the eye, none have passed the criterion of producing homeosis, that is, gene expression when the gene is transferred from one site to another.
		Davidson (2001) expresses serious doubt about the concept of master control genes and calls them a “fantasy of earlier days”.
	www.structuralselforganization.org /gene3.htm (1357 words)

	Interactive Fly, Drosophila (Site not responding. Last check: 2007-09-17)
		Induction of uncontrolled growth and deregulation of Hox genes are linked in mammals, where Hox products can induce leukemia.
		In Drosophila, modification of homeotic gene expression causes homeosis, sometimes associated with increased proliferation but not with uncontrolled tumorous growth, possibly because the identity of each segment is specified by a combination of HOM products.
		Loss or gain of one HOM gene will likely lead to a new combination that is found elsewhere in wild type, and cells expressing this combination could be expected to follow the corresponding developmental pathway and give rise to homeotic transformations.
	www.sdbonline.org /fly/polycomb/postsex3.htm (10853 words)

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