The Plastid Genome of Polytoma uvella Is the Largest Known among Colorless Algae and Plants and Reflects Contrasting Evolutionary Paths to Nonphotosynthetic Lifestyles1[OPEN]
نویسندگان
چکیده
Department of Biology, University of New Brunswick, Fredericton, New Brunswick, Canada E3B 5A3 (F.F.-M., A.M.N., A.R.-P.); Consejo Nacional de Ciencia y Tecnología-Universidad Autónoma Metropolitana, Vicentina, Mexico City 0934, Mexico (F.F.-M.); Biology Department, University of Western Ontario, London, Ontario, Canada N6A 5B7 (D.R.S.); and Integrated Microbiology Program, Canadian Institute for Advanced Research, Toronto, Ontario, Canada M5G 1Z8 (A.R.-P.)
منابع مشابه
The Plastid Genome of Polytoma uvella Is the Largest Known among Colorless Algae and Plants and Reflects Contrasting Evolutionary Paths to Nonphotosynthetic Lifestyles.
The loss of photosynthesis is frequently associated with parasitic or pathogenic lifestyles, but it also can occur in free-living, plastid-bearing lineages. A common consequence of becoming nonphotosynthetic is the reduction in size and gene content of the plastid genome. In exceptional circumstances, it can even result in the complete loss of the plastid DNA (ptDNA) and its associated gene exp...
متن کاملThe plastid genomes of nonphotosynthetic algae are not so small after all
The thing about plastid genomes in nonphotosynthetic plants and algae is that they are usually very small and highly compact. This is not surprising: a heterotrophic existence means that genes for photosynthesis can be easily discarded. But the loss of photosynthesis cannot explain why the plastomes of heterotrophs are so often depauperate in noncoding DNA. If plastid genomes from photosyntheti...
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Polytomella spp. are free-living, nonphotosynthetic green algae closely related to the model organism Chlamydomonas reinhardtii. Although colorless, Polytomella spp. have a plastid, but it is still unknown whether they harbor a plastid genome. We took a next generation sequencing approach, along with transcriptome sequencing, to search for a plastid genome and an associated gene expression syst...
متن کاملA plastid without a genome: evidence from the nonphotosynthetic green algal genus Polytomella.
Polytomella spp. are free-living, nonphotosynthetic green algae closely related to the model organism Chlamydomonas reinhardtii. Although colorless, Polytomella spp. have a plastid, but it is still unknown whether they harbor a plastid genome. We took a next generation sequencing approach, along with transcriptome sequencing, to search for a plastid genome and an associated gene expression syst...
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Since the endosymbiotic origin of chloroplasts from cyanobacteria 2 billion years ago, the evolution of plastids has been characterized by massive loss of genes. Most plants and algae depend on photosynthesis for energy and have retained ∼110 genes in their chloroplast genome that encode components of the gene expression machinery and subunits of the photosystems. However, nonphotosynthetic par...
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