a bacterial protein puts a new twist on dna transcription细菌蛋白质给dna转录一个新的转折.pdf
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Synopses of Research Articles
Ciliate Genome Sequence Reveals Unique Features of a Model Eukaryote
Richard Robinson | DOI: 10.1371/journal.pbio.0040304
One reason to sequence the genomes from what were once free-living
of non-human organisms is to better cyanobacteria; typically, many of the
understand our similarities and genes of such an endosymbiont are
differences. And, at fi rst sight, it is hard shifted into the host nucleus, as they
to imagine a eukaryote more different have been in the apicomplexans and
from humans than Tetrahymena dinofl agellates. T. thermophila has no
thermophila. A relative of Paramecium, plastids, but it has been suggested
this single-celled creature has a strong that its ancestors did. The authors
but fl exible exterior covered with discovered no remnants of plastid
rows of cilia; but it is inside where genes within T. thermophila, strongly
things seem to get really alien. Each suggesting that plastid acquisition
cell contains not one but two nuclei: a occurred after the other two groups
micronucleus, which contains only fi ve split off from the ciliate
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