Extensive Ribosomal DNA Genic Variation in the Columnar Cactus Lophocereus

2001 ◽  
Vol 53 (2) ◽  
pp. 124-134 ◽  
Author(s):  
Stefanie Hartmann ◽  
John D. Nason ◽  
Debashish Bhattacharya
Keyword(s):  
Ribosomal Dna ◽  
Columnar Cactus ◽  
Genic Variation

Areole Changes During Bark Formation for Columnar Cactus Species

Haseltonia ◽  
2020 ◽  
Vol 2019 (26) ◽  
pp. 7
Author(s):  
Lance S. Evans ◽  
Catherine A. McDonough
Keyword(s):  
Columnar Cactus

Construction of columnar cactus-like 2D/1D CdxCu1-xS@CuO shell-core structure photocatalyst for the reduction of CO2 to methanol

2021 ◽  
Vol 115 ◽  
pp. 111016
Author(s):  
Jihai Duan ◽  
Pengxia Sun ◽  
Hui Zhao ◽  
Zhengnan Ji ◽  
Delu Zhang ◽  
...  
Keyword(s):  
Core Structure ◽  
Columnar Cactus ◽  
Reduction Of Co2

scholarly journals Physical Mapping of Ribosomal DNA Genes on Jatropha curcas Chromosomes by Multicolor FISH

CYTOLOGIA ◽  
2009 ◽  
Vol 74 (2) ◽  
pp. 133-139 ◽  
Author(s):  
Magdalena Witkowska ◽  
Nobuko Ohmido ◽  
Joyce Cartagena ◽  
Nakako Shibagaki ◽  
Shin'ichiro Kajiyama ◽  
...  
Keyword(s):  
Ribosomal Dna ◽  
Physical Mapping ◽  
Jatropha Curcas ◽  
Multicolor Fish

scholarly journals Epigenetic Changes in Host Ribosomal DNA Promoter Induced by an Asymptomatic Plant Virus Infection

Biology ◽  
2020 ◽  
Vol 9 (5) ◽  
pp. 91 ◽  
Author(s):  
Miryam Pérez-Cañamás ◽  
Elizabeth Hevia ◽  
Carmen Hernández
Keyword(s):  
Gene Silencing ◽  
Ribosomal Dna ◽  
Plant Virus ◽  
Dna Methyltransferase ◽  
Cytosine Methylation ◽  
De Novo ◽  
Methylation Pattern ◽  
Transcriptional Gene Silencing ◽  
Post Transcriptional Gene Silencing ◽  
The Impact

DNA cytosine methylation is one of the main epigenetic mechanisms in higher eukaryotes and is considered to play a key role in transcriptional gene silencing. In plants, cytosine methylation can occur in all sequence contexts (CG, CHG, and CHH), and its levels are controlled by multiple pathways, including de novo methylation, maintenance methylation, and demethylation. Modulation of DNA methylation represents a potentially robust mechanism to adjust gene expression following exposure to different stresses. However, the potential involvement of epigenetics in plant-virus interactions has been scarcely explored, especially with regard to RNA viruses. Here, we studied the impact of a symptomless viral infection on the epigenetic status of the host genome. We focused our attention on the interaction between Nicotiana benthamiana and Pelargonium line pattern virus (PLPV, family Tombusviridae), and analyzed cytosine methylation in the repetitive genomic element corresponding to ribosomal DNA (rDNA). Through a combination of bisulfite sequencing and RT-qPCR, we obtained data showing that PLPV infection gives rise to a reduction in methylation at CG sites of the rDNA promoter. Such a reduction correlated with an increase and decrease, respectively, in the expression levels of some key demethylases and of MET1, the DNA methyltransferase responsible for the maintenance of CG methylation. Hypomethylation of rDNA promoter was associated with a five-fold augmentation of rRNA precursor levels. The PLPV protein p37, reported as a suppressor of post-transcriptional gene silencing, did not lead to the same effects when expressed alone and, thus, it is unlikely to act as suppressor of transcriptional gene silencing. Collectively, the results suggest that PLPV infection as a whole is able to modulate host transcriptional activity through changes in the cytosine methylation pattern arising from misregulation of methyltransferases/demethylases balance.

scholarly journals DIFFERENTIATION OF DROSOPHILA CELLS LACKING RIBOSOMAL DNA, IN VITRO

Genetics ◽  
1973 ◽  
Vol 73 (3) ◽  
pp. 429-434
Author(s):  
J James Donady ◽  
R L Seecof ◽  
M A Fox
Keyword(s):  
Drosophila Melanogaster ◽  
Ribosomal Rna ◽  
Ribosomal Dna ◽  
Rna Synthesis ◽  
Wild Type ◽  
Drosophila Cells

ABSTRACT Drosophila melanogaster embryos that lacked ribosomal DNA were obtained from appropriate crosses. Cells were taken from such embryos before overt differentiation took place and were cultured in vitro. These cells differentiated into neurons and myocytes with the same success as did wild-type controls. Therefore, ribosomal RNA synthesis is not necessary for the differentiation of neurons and myocytes in vitro.

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