Nucleolus organizer regions (NORs) are chromosomal regions crucial for the formation of the nucleolus. (wikipedia.org)
NORs can also be seen in nucleoli using silver stain, and that is being used to investigate cancerous changes. (wikipedia.org)
The distal flanking junction (DJ) of the NORs has been shown to associate with the periphery of nucleoli. (wikipedia.org)
Activity satellite association and polymorphism of Ag stained nucleolus organizer regions (Ag+ NORs) in lymphocytes from women with cervical uterine cancer. (org.ua)
The karyotype and distribution of constitutive heterochromatin and nucleolus organizer regions (NORs) of Anatolian leuciscine endemic to Lake Beysehir, Squalius anatolicus (Bogutskaya, 1997) were analyzed respectively using conventional Giemsa-staining, C-banding and Ag-impregnation. (egejfas.org)
Loci4
Ribosomal RNA genes at different nucleolar organizer (NOR) loci in hexaploid wheat are expressed at different levels. (ncsu.edu)
The degree of expression of a particular organizer depends on the genetic background, especially on the presence of other NOR loci. (ncsu.edu)
For example, when chromosome 1U of Aegilops umbellulata is introduced into the hexaploid wheat cultivar “Chinese Spring” the A. umbellulata NOR accounts for most of the nucleolar activity and seems to suppress the activity of the wheat NOR loci. (ncsu.edu)
Later, Dang et al (3) produced a higher resolution map of Yr78 and mapped it within a 0.05-cM interval that corresponds to an 11.16 Mb region between loci TraesCS6B02G116200 and TraesCS6B02G118000 in the "Chinese Spring" genome (RefSeq v1.1), which contains 15 genes. (ucdavis.edu)
Interstitial2
Fusion of the break-off donor chromosome segment to telomeric or interstitial regions of recipient chromosomes can form different chromosomal patterns of jumping translocations. (biomedcentral.com)
An interstitial nucleolus organizer region in the long arm of human chromosome 7: cytogenetic characterization and familial segregation. (cs-tl.de)
Genes2
Cytosine methylation has been studied in wheat rRNA genes at nucleolar organizers displaying different activities. (ncsu.edu)
DNase I sensitivity of ribosomal RNA Genes in chromatin and nucleolar dominance in wheat. (ncsu.edu)
RDNA4
There are also DNA sequences related to rDNA that are on other chromosomes and may be involved in nucleoli formation. (wikipedia.org)
rDNA operons in Escherichia coli have been found to cluster near each other, similar to a eukaryotic nucleolus. (wikipedia.org)
We have previously shown that these and other examples of nucleolar dominance in wheat are associated with undermethylation of cytosine residues in certain regions of the dominant rDNA. (ncsu.edu)
In addition, we have mapped several DNase I-hypersensitive sites in the intergenic spacer region of the rDNA repeating unit. (ncsu.edu)
Chromosomes1
Оf the research work was to establish the frequency and spectrum of chromosomal aberrations, associations of acrocentric chromosomes in infants from different ecological regions of Ivano-Frankivsk region. (org.ua)
Ribosomal2
These regions code for 5.8S, 18S, and 28S ribosomal RNA. (wikipedia.org)
Cytosine methylation in ribosomal DNA and nucleolus organiser expression in wheat. (ncsu.edu)
Immunohistochemical analysis of tissue sections with affinity-purified antiserum raised against a recombinant Ngp-1 protein revealed that the antigen was exclusively localized to the nucleolus and nucleolar organizer regions in all cell types analyzed. (elsevierpure.com)
Bex1 shows cell density-dependent accumulation as a condensate either in nucleoli at a low cell density or at the apical cell surface at a high cell density. (biomedcentral.com)
Genome2
The exact sequence of these regions is not included in the human reference genome as of 2016 or the GRCh38.p10 released January 6, 2017. (wikipedia.org)
For many regions of the genome, we have detected multiple overlapping transcripts including both small, gene-sized RNAs and large transcripts covering entire gene clusters. (ncsu.edu)
Precursor2
Some of these sites are located near the initiation region for the 45 S rRNA precursor, while others are associated with a series of short direct repeats 5′ to the 45 S rRNA initiation site. (ncsu.edu)
Epidermal growth factor (EGF) and fibroblast growth factor 2 (FGF-2) induce the proliferation of neural precursor cells isolated from specific regions of the embryonic and adult brain. (beauty104.com.tw)
Presence1
Low recombination rates were observed in this segment, possibly due to the presence of the un-assembled nucleolus organizer NOR-B2 region within the Yr78 candidate gene region. (ucdavis.edu)