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Example sentences for: buchnera
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Among fully sequenced published genomes, the only instance of a highly reduced genome that shows a close relationship to large genomes is Buchnera aphidicola, the obligate endosymbiont of aphids (Insecta).
Also unusual in Buchnera is the lack of uvrA, uvrB and uvrC (encoding an excision nuclease involved in repair of UV damage to DNA).
In Buchnera, however, the hypothesized loss of promoters suggests a general genomic decay influencing transcriptional regulation; this is supported by the observation that SD sequences are also degenerate, and by the finding that some of the most frequently used codons in the genome do not have corresponding tRNAs because they have been deleted throughout Buchnera 's evolution.
Buchnera lacks phage or insertion sequences [ 8].
Buchnera provides the first case of a fully sequenced, highly reduced genome for which closely related large genomes exist and have been sequenced, allowing reconstruction of the steps in genome reduction.