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Multiple forms of extrachromosomal DNA exist, and, while some of these serve important biological functions, [1] they can also play a role in diseases such as cancer. [ 2 ] [ 3 ] [ 4 ] In prokaryotes , nonviral extrachromosomal DNA is primarily found in plasmids , whereas, in eukaryotes extrachromosomal DNA is primarily found in organelles . [ 1 ]
Extrachromosomal circular DNA (eccDNA) is a type of double-stranded circular DNA structure that was first discovered in 1964 by Alix Bassel and Yasuo Hotta. [1] In contrast to previously identified circular DNA structures (e.g., bacterial plasmids, mitochondrial DNA, circular bacterial chromosomes, or chloroplast DNA), eccDNA are circular DNA found in the eukaryotic nuclei of plant and animal ...
Karyotype visualisation in Ensembl Genomes. The key feature of Ensembl Genomes is its graphical interface, which allows users to scroll through a genome and observe the relative location of features such as conceptual annotation (e.g. genes, SNP loci), sequence patterns (e.g. repeats) and experimental data (e.g. sequences and external sequence features mapped onto the genome). [1]
The decrease in circular rDNA and the degradation of the amplified rDNA population in early embryo development indicated that the small circular molecules are homologous to the rDNA gene cluster, meaning that an abundance of rDNA sequences are not prone to generating circular chromosomes from random events like breakage of ligation. [15]
For example, ncl-1, located in chromosomal DNA, exhibits a larger nucleolus than the wild-type allele, which is in the array. Thus, cells which exhibit larger nucleoli have usually not retained the extrachromosomal array. The gene of interest is the target of the mosaic analysis. Cells lacking the extrachromosomal array also lack the functional ...
Human genetics is the study of inheritance as it occurs in human beings.Human genetics encompasses a variety of overlapping fields including: classical genetics, cytogenetics, molecular genetics, biochemical genetics, genomics, population genetics, developmental genetics, clinical genetics, and genetic counseling.
Some forms of gene therapy require the insertion of therapeutic genes at pre-selected chromosomal target sites within the human genome. Plasmid vectors are one of many approaches that could be used for this purpose. Zinc finger nucleases (ZFNs) offer a way to cause a site-specific double-strand break to the DNA genome and cause homologous ...
Aside from these models, several studies suggest other processes for DM formation such as through the breakdown of a homogeneously staining region (HSR) following cell fusion, [5] through chromosomal breaks due to hypoxia induced activation of fragile sites, [6] or reduction in the level of DNA methylation.