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The Origin of Mitochondria - Book Report/Review Example

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Running head: THE ORIGINS OF MITOCHONDRIA The Origins of Mitochondria [Author’s Name] [University] Abstract The origins of mitochondria remain an important object of professional interest. Dozens of researchers explored the origins of mitochondria and their implications for future research…
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The Origin of Mitochondria
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Recommendations for future research are provided. Keywords: mitochondria, origins, microsporidia, evolution. The Origins of Mitochondria The origins of mitochondria remain one of the most popular objects of professional interest. Much has been written and said about the structure of various genes and their implications for understanding the history of mitochondria. In this sense, the study conducted by Peyretaillade, Broussolle, Peyret, Metenier, Gouy and Vivares (1998) deserves special attention. The researchers claim that, based on previous studies, “three eukaryotic protozoan phyla, Microsporidia, Metamonada, and Parabasala were considered to be the earliest-diverging lineages among all extant protists” (Peyretaillade et al., 1998, p.683). As far as these organisms lack mitochondrial features, they were believed to originate from the earliest eukaryotes living before mitochondria (Peyretaillade et al., 1998). However, just recently, three nuclear-encoded genes with mitochondrial features have been found in a Trichomonas vaginalis genome (Peyretaillade et al., 1998). This being said, the researchers decided to test previous assumptions about the origins of mitochondria and re-assess the immunological evidence for the presence of mitochondrial features in Encephalitozoon hellem (Peyretaillade et al., 1998). ...
The hsp70 gene family is also very similar to ?-proteobacterial homologs, which is suggestive of mitochondrial evolutionary origins for HSP70-encoding genes (Peyretaillade et al., 1998). Peyretaillade et al. (1998) chose to explore the presence of an hsp70 gene sequence in E. cuniculi and E. hellem genomes. The presence or absence of mitochondrial features had to confirm or reject the mitochondrial origins of the hsp70 gene sequence (Peyretaillade et al., 1998). The researchers developed complex methodology, incorporating the elements of gene cloning and phylogenic analysis (Peyretaillade et al., 1998). Peyretaillade et al. (1998) obtained E. cuniculi and E. hellem samples and cloned the hsp70 gene, followed by pulsed-field gel electrophoresis and sequence analysis (Peyretaillade et al., 1998). The researchers found that the genomes of E. cuniculi and E. hellem had a single copy of the mitochondrially expressed HSP70 protein (Peyretaillade et al., 1998). In the meantime, other parasites have more than one mitochondrially expressed gene copies (Peyretaillade et al., 1998). These results suggest that the HSP70 protein evolved from mitochondrial-like species and, consequentially, cast doubts on the existence of amitochondrial eukaryotes (Peyretaillade et al., 1998). Not all researchers readily agree that the HSP70-gene sequences in E. cuniculi and E. hellem genomes are primarily connected to mitochondrial eukaryotes. While Peyretallade et al. (1998) focused on the analysis of hsp-70 genes, Andersson et al. (1998) devoted much of their time to the study of Rickettsia Prowazekii and its relation to the origins of mitochondria. Andersson et al. (1998) were able to describe the entire genome sequence of Rickettsia prowazekii, which is responsible for the development of Read More
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