RESUMO
The complete mitochondrial genome (mtDNA) of hemocyte from Siberian Crane (Grus leucogeranus) was sequenced using high-throughput genetic sequencing, and mitochondrial genome was assembled using MITObim tools according complete mitochondrial genome of Grus leucogeranus (NCBI Reference Sequence: NC_020574.1). The assembled mitogenome, consisting of 16,747 bp, has unique 14 protein-coding genes (PCGs), 22 transfer RNAs, and two ribosomal RNAs genes. The complete mitogenome provides essential and important DNA molecular data for further phylogenetic and evolutionary analysis for Siberian Crane phylogeny.
RESUMO
It is well known that the karyotype of animal cells cultured in vitro tends to become aneuploid as the culture ages. Aneuploidy can cause genetic instability, alter the biological properties of cells, and affect their application in genetic studies and cell engineering. Understanding the causes and mechanisms of aneuploidy is primary to control its occurrence in cultured cells, and is also helpful to understand the mechanisms of tumorigenesis because aneuploidy is a hallmark of tumor cells. This review underscores the potential role of reactive oxygen species (ROS) toxicity in spontaneous aneuploidy of cultured cells. The underlying mechanisms and possible sources of ROS are also discussed.
Assuntos
Envelhecimento/efeitos dos fármacos , Aneuploidia , Regulação Neoplásica da Expressão Gênica/genética , Espécies Reativas de Oxigênio/toxicidade , Técnicas de Cultura de Células , Proliferação de Células , Transformação Celular Neoplásica/efeitos dos fármacos , Humanos , Cariótipo , Proteína Supressora de Tumor p53/genéticaRESUMO
Some pesticides have been considered potential chemical mutagens and their widespread use involves the assessment of their potentially hazardous effects. The mitochondrial genome is especially prone to DNA damage and thus can serve as a biomarker to monitor the genotoxicity of pesticides to human DNA. We performed a screening for somatic mutations in lung tissues from pesticide-exposed fruit growers, by direct comparing the entire mtDNA sequences of the lung tissue and the matched peripheral blood from the same individual. A phylogenetic approach and a high standard procedure were utilized to avoid potential errors in data generation and analysis. We observed a significantly increased frequency of mtDNA somatic mutations in lung tissues which had been exposed to pesticides multiple times by inhalation, and the potential biological significance of these mutations was further discussed. The samples represented in this observational study, which has multiple exposures to pesticides, experience a significant greater incidence of mtDNA mutations, suggesting that multiple exposures to pesticides could damage human mtDNA and cause somatic mutations.