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Topic: Heterochromatic

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	Genome Biology \| Full text \| Heterochromatic sequences in a Drosophila whole-genome shotgun assembly
		Heterochromatin is concentrated in megabase-sized tracts in the centric and subtelomeric regions of the chromosomes.
		The lengths of the heterochromatic portions of the chromosome arms (green) are estimated from measurements of mitotic chromosomes [76].
		The WGS3 heterochromatic sequence was aligned to the corresponding portion of the Release 2 sequence.
	genomebiology.com /2002/3/12/research/0085 (9267 words)

	HETEROCHROMATIZATION AS A CHANGE OF CHROMOSOME CYCLE
		Heterochromatization of the inert regions and the active ones which are located in their vicinity is identical with those changes in the chromosome properties that ordinarily attend the transition of the nucleus from the metabolic stage to division.
		The heterochromatic chromosome sections (active or inert) are characterized by a considerable acceleration of prophasic processes and a considerable retardation of telophasic ones, leading to a great shortening of the metabolic stage of these chromosome regions.
		Heterochromatization is a normal change in the chromosome cycle, which indicates a transition of chromosome regions to the 'mitotic' condition.
	www.bulbnrose.com /Heredity/prokofyeva/prokofyeva.html (6037 words)

	Heterochromatin - Wikipedia, the free encyclopedia
		Both centromeres and telomeres are heterochromatic, as is the Barr body of the second inactivated X chromosome in a female.
		DNA is tightly packaged into structures called nucleosomes, which consist of 8 proteins called histones and exactly 146bp of DNA wound in 1.65 tight turns.
		Specifically, heterochromatic histone tails are generally deacetylated on their lysine residues, and methylated on other lysine residues, establishing a heterochromatic "pattern" of histone modifications.
	en.wikipedia.org /wiki/Heterochromatin (1057 words)

	Heterochromatic P Inserts
		The highest frequencies were observed when the P element jumped from heterochromatic sites on the Y or 2nd chromosomes; up to 37%of all recovered insertions variegated.
		We propose that the increased recovery of variegating insertions from heterochromatic starting sites may result from physical proximity of different heterochromatic regions in germ line nuclei, or the association of mobilizing elements with heterochromatin proteins.
		In addition, the P insertions will be used to manipulate the structure of the heterochromatic portion of the genome.
	taputea.lbl.gov /research/het/HetPs/index.html (457 words)

	Figures
		Only two heterochromatic bivalents, formed by the pairing of the four C-banded autosomes showed in 2A, are observed.
		The Y (heterochromatic) and X (euchromatic) chromosomes appear as univalents, as typically observed in hemipteran insects.
		Heterochromatic C-bands are clearly detected in four autosomes and in the Y sex chromosome.
	www.medscape.com /content/2004/00/47/13/471346/471346_fig.html (512 words)

	Genome Biology \| Full text \| Heterochromatic sequences in a Drosophila whole-genome shotgun assembly
		Heterochromatic genes have been defined by mutations that affect viability or fertility [33].
		Although heterochromatic genes appear to differ from euchromatic genes in some aspects of gene structure, they do not appear to be segregated in any obvious way based on function.
		WGS3 heterochromatic sequence and annotations will be deposited in GenBank and the Fly Base GadFly database [75], and the corresponding Release 2 sequences will be subsumed into the new sequence accessions.
	www.genomebiology.com /2002/3/12/RESEARCH/0085 (7700 words)

	Facultative heterochromatization in parahaploid male mealybugs: involvement of a heterochromatin-associated protein -- ...
		Facultative heterochromatization in parahaploid male mealybugs: involvement of a heterochromatin-associated protein -- Bongiorni et al.
		in chromosome imprinting and heterochromatization in the mealybug,
		HP-1 immunostaining is concentrated over heterochromatic chromosomes (arrowheads), with the euchromatic homologs lacking any labeling (small arrow in B indicates the secondary constriction corresponding to the nucleolus organizing region of a chromosome).
	dev.biologists.org /cgi/content/full/128/19/3809 (4666 words)

	The Contribution of Color to Motion Processing in Macaque Middle Temporal Area -- Thiele et al. 19 (15): 6571 -- ...
		The heterochromatic sinusoid was itself produced by antiphase summation of sinusoidal modulations of red and green display phosphors.
		Data are from a representative MT neuron, which illustrate neuronal responses as a function of (1) luminance contrast in the heterochromatic grating (columns) and (2) directional polarity of the opposed-motion stimulus (rows).
		Responses obtained when the heterochromatic component moved in the neuronal preferred direction are indicated by the circles; corresponding responses obtained when the achromatic component moved in the preferred direction are indicated by asterisks.
	www.jneurosci.org /cgi/content/full/19/15/6571 (9150 words)

	Garcia
		Studies on the heterochromatic regions of chromosomes have become more and more interesting because it has been discovered that heterochromatin is not "junk" DNA but an essential element of the eukaryotic genome, with possible structural and/or functional relevance (Pardue and Henning, 1990; Henning, 1999).
		Giemsa staining produced heavy bands in the centromeric and pericentromeric regions of chromosome II and the X chromosome, as well as one band on the centromere of chromosome III, and a stained block outside the centromeric region.
		The Y chromosome, that appeared totally heterochromatic with Giemsa staining, presented an intensely stained band in the centromeric region after C-banding and was sub-metacentric (Figure 2).
	www.ou.edu /journals/dis/DIS83/Technique83/9tecGarcia/Garcia.htm (920 words)

	Chromosome Rearrangements Induce Both Variegated and Reduced, Uniform Expression of Heterochromatic Genes in a ...
		of a heterochromatic insertion and the pericentric heterochromatin
		Expression of the heterochromatic lt gene in both undifferentiated and differentiated cells is sensitive to the association of heterochromatin proteins with surrounding repetitive DNAs.
		Following differentiation (B), heterochromatic gene expression may be further compromised as a result of a decrease in the nuclear concentration of heterochromatin proteins.
	www.genetics.org /cgi/content/full/149/3/1451 (6577 words)

	DHGP: Maps
		Many of these scaffolds have been annotated and cytologically mapped to the heterochromatic regions of chromosomes.
		As the heterochromatin sequence is finished to high quality we will offer improved assemblies of the heterochromatic scaffolds and their localizations in the genome using a variety of techniques.
		Users with maps of heterochromatic regions are encouraged to contribute their data so it can be integrated into our knowledge of the heterochromatin landscape and recorded in the database for FlyBase.
	www.dhgp.org /index_maps.html (139 words)

	Mechanisms of Gene Repression and De-Repression within Interphase Chromatin.
		Classical cytological studies revealed that the heterochromatic segments of particular chromosomes could be mapped by virtue of the prematurely condensed state (allocycly) of such segments during cell prophase (35), a time when the individual chromosomes are each fairly distinct (15).
		Utilizing such mapping of chromosomes during cell prophase, it was conclusively established that the heterochromatic sex chromatin body of Barr (14), found in female mammalian cells during cell interphase (14), was formed from one of the two X chromosomes in such cells (15).
		Concurrently, it was found that this repressed and heterochromatic X chromosome displayed a characteristic delay in the onset of DNA replication during the S phase of its cell division (37-39).
	www.euchromatin.org /chromatin10.htm (8855 words)

	Amazon.com: heterochromatic (Site not responding. Last check: )
		Differential staining of heterochromatic regions in chromosomes from cultured lymphocytes of cattle (bos taurus) using modified banding techniques, by William A Raux (Unknown Binding - 1977)
		A heterochromatic study of the Pleiades (Annals of the Astronomical Observatory of Harvard College) by Cecilia Helena Payne Gaposchkin (Unknown Binding - 1932)
		An "average eye" for heterochromatic photometry, and a comparison of a flicker and an equality-of-brightness photometer, (Bulletin of the Bureau of Standards) by Eugene Casson Crittenden (Unknown Binding - 1918)
	www.amazon.com /s?ie=UTF8&keywords=heterochromatic&index=blended&page=1 (723 words)

	Advances in Alfalfa Cytogenetics
		B-chromosomes are usually smaller than the normal A chromosomes and are generally heterochromatic; they normally do not influence the viabili ty and phenotype of the organism; they do not pair with the A chromosomes; they can affect mitotic behavior by lagging and elimination, polymitosis, or preferential distribution (Reiger, et al., 1991).
		In general a majority of the heterochromatic bands appear in the short arms of the chromosomes with only two chromosomes possessing interstitial bands on their long ar ms (Bauchan and Hossain, unpublished).
		Heterochromatic DNA interferes with chiasmata formation and thus crossing over near these regions is reduced (Kaltsikes and Gustfason, 1984).
	www.naaic.org /TAG/TAGpapers/Bauchan/advcytog.html (5708 words)

	Breakpoints of TB-10L19, TB-10L30 and TB-7Lb (Site not responding. Last check: )
		Since the 10-B chromosome carried the major portion of the distal heterochromatic region of the B chromosome, the exact break position could not be determined due to presence of the heterochromatic mass at its end.
		Two of the three arms were from chromosome 10, and the third arm is the distal heterochromatic region of the B chromosome.
		B parts of the 7-B chromosome (including part of the proximal euchromatic region followed by the entire distal heterochromatic region) did not fold back and thus allowed an accurate measurement of the breakpoint, which is at the 0.34 position.
	www.agron.missouri.edu /mnl/60/86lin.html (538 words)

	JUIZ DE FORA-MG, BRAZIL (Site not responding. Last check: )
		With the objective of verifying the relationship between chromosomic breaks induced by gamma irradiation and heterochromatic regions, maize line L-869 (of the Federal University of Viçosa) pollen grains were exposed to 36 and 72 Gy of gamma radiation and soon after used for pollination.
		It was observed that the occurrence of bridges was not directly related to the presence of heterochromatic regions (Figure 1).
		Considering that maize C-banding technique identifies heterochromatic regions present in the knobs, it is possible that, for the anaphases without strongly stained regions on the bridges, the involved chromosomes do not have knobs.
	www.maizegdb.org /mnl/75/06viccini.html (416 words)

	Unbound MEDLINE \| [Variations of heterochromatic chromosomal regions and chromosome abnormalities in children with ...
		[Variations of heterochromatic chromosomal regions and chromosome abnormalities in children with autism: identification of genetic markers in autistic spectrum disorders] Zhurnal nevrologii i psikhiatrii imeni S.S. Korsakova / Ministerstvo zdravookhraneniia i meditsinsko¿ promyshlennosti Rossi¿sko¿ Federatsii, Vserossi¿skoe obshchestvo nevrologov [i] Vserossi¿skoe obshchestvo psikhiatrov.
		Using C-banding and quantitative fluorescent in situ hybridization (FISH), the significantly increased incidence of heterochromatic region variation was shown in autism as compared to the controls (48 and 16%, respectively).
		Basing on the data obtained, a possible role of position effect in autism pathogenesis as well as a potential of heterochromatic region variation analysis for the search of biological markers of autistic spectrum disorders are discussed.
	www.unboundmedicine.com /medline/ebm/record/16841485/full_citation/[Variations_of_heterochromatic_chromosomal_regions_and_chromosome_abnormalities_in_children_with_autism:_identification_of_genetic_markers_in_autistic_spectrum_disorders] (231 words)

	Processing
		Almost 1/3 of the Drosophila genome is heterochromatic and essentially unclonable.
		There are over 60 million bases of heterochromatic DNA that are not available.
		It is generally believed that this heterochromatic DNA is not important, containing massive amounts of repetitive DNA and such.
	radio.weblogs.com /0100187/gems/NEWSLETTER/processing.html (653 words)

	Directory of open access journals
		C-banding was used to study the variations in heterochromatic block markings in chromosomes of Anopheles darlingi and A. nuneztovari from Manaus, State of Amazonas, and Macapá, State of Amapá, Brazil.
		The markings on autosomal chromosomes were concentrated in the centromeric region in both species, with a heterochromatic block in one arm of chromosome II of A. darlingi.
		Only intraspecific variation was found in heterochromatic block markings in the sex chromosomes and autosomes in the two populations of both species at each location.
	www.doaj.org /doaj?func=abstract&id=41129&recNo=13&toc=1 (199 words)

	Epigenetics: Let us join together in silence - Cell Signaling Update - Signaling Gateway
		The RNA-induced initiation of transcriptional gene silencing (RITS) complex is known to be required for heterochromatic gene silencing, but it also contains short interfering (si)RNAs that are generated by Dicer (Dcr), an enzyme that is involved in RNAi.
		also investigated whether the stable association of RITS with heterochromatic loci was essential for the processing of rare repeat transcripts that escape transcriptional silencing.
		Heterochromatic marks are initially established in a Dcr-dependent manner, and therefore presumably through the RNAi pathway.
	www.signaling-gateway.org /update/updates/200412/nrm1557.html (517 words)

	The Effects of Chromosome Rearrangements on the Expression of Heterochromatic Genes in Chromosome 2L of Drosophila ...
		The Effects of Chromosome Rearrangements on the Expression of Heterochromatic Genes in Chromosome 2L of Drosophila melanogaster -- Wakimoto and Hearn 125 (1): 141 -- Genetics
		The Effects of Chromosome Rearrangements on the Expression of Heterochromatic Genes in Chromosome 2L of Drosophila melanogaster
		Eu-heterochromatic Rearrangements Induce Replication of Heterochromatic Sequences Normally Underreplicated in Polytene Chromosomes of Drosophila melanogaster
	www.genetics.org /cgi/content/abstract/125/1/141 (1125 words)

	Heterochromatin and chromosome evolution: a FISH probe of Cebus apella paraguayanus (Primate: Platyrrhini) developed by ...
		Heterochromatic blocks of chromosome pair 11 of CAPp (11qHe+) were microdissected with a glass needle attached to a mechanical micromanipulator (Eppendorf 5171).
		One individual showed 10 signals: the whole heterochromatic region of pair 11 and the extracentromeric heterochromatic blocks of the pairs 4, 12, 13, and 19 previously characterized by C-banding (data not shown).
		DAPI staining confirmed the identity of the heterochromatic blocks of all pairs in which the signal of the 11qHe+ was observed.
	funpecrp.com.br /gmr/year2005/vol4-4/gmr0178_full_text.htm (3122 words)

	Colonization of Heterochromatic Genes by Transposable Elements in Drosophila -- Dimitri et al. 20 (4): 503 -- Molecular ...
		The heterochromatic rolled gene of Drosophila melanogaster is extensively polytenized and transcriptionally active in the salivary gland chromocenter.
		Molecular aspects of intron evolution in dynein encoding mega-genes on the heterochromatic Y chromosome of Drosophila sp.
		Evidence for the adaptive significance of an LTR retrotransposon sequence in a Drosophila heterochromatic gene.
	mbe.oxfordjournals.org /cgi/content/full/20/4/503 (4814 words)

	CNR-->Istituto IGM --> Articoli JCR (Site not responding. Last check: )
		Transcriptional activation of a constitutive heterochromatic domain of the human genome in response to heat shock.
		In this article we show that these heterochromatic domains are characterized by an epigenetic status typical of euchromatic regions.
		This is the first report of a transcriptional activation of a constitutive heterochromatic portion of the genome in response to stress stimuli.
	www.cnr.it /istituti/ArticoliJCR.html?cds=040&id=22316 (190 words)

	[Localization of repetitive DNA sequences in the pericentromeric heterochromatin of malarial mosquitoes of the "Ano
		Distribution of eight fragments of conserved repetitive DNA from pericentromeric heterochromatin of chromosome 2 of Anopheles atroparvus has been investigated by in situ hybridization on polytene chromosomes of An.
		We have shown that heterochromatic regions of all chromosomes both in An.
		DNA comparison of pericentromeric heterochromatic regions of chromosomes in species of the "Anopheles maculipennis" complex is species- and chromosome-specific, due, in particular, to different maintenance of conserved repeates.
	www.galenicom.com /medline/article/16805314/mt:Heterochromatin (215 words)

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