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Table 1 Chloroplast Genome Features of T. oceanica in Comparison with T. pseudonana and P. tricornutum

From: Recent transfer of an iron-regulated gene from the plastid to the nuclear genome in an oceanic diatom adapted to chronic iron limitation

  Thalassiosira oceanica CCMP 1005 Thalassiosira pseudonana CCMP 1335 Phaeodactylum tricornutum CCAP 1055/1
genome size [bp] 141 790 128 814 117 369
LSC 70 298 65 250 63 674
SSC 24 106 26 889 39 871
IR 23 693 IRa: 18 338 6 912
   IRb: 18 337  
G+C content [%] 30,39 30,66 32,56
A+T content [%] 69,61 69,34 67,44
gene content [#] 158+2 159 162
protein coding 126 +orf127 127 130
rRNA 3 3 3
tRNA 27 27 27
other RNAs 2 +flrn 2 2
in T. oceanica, but not in T. pseudonana orf127a, flrn   
in T. pseudonana, but not in T. oceanica   petF a  
in IR of T. oceanica, but not in IR of T. pseudonana clpC , trnC , trnL   
in P. tricornutum only    tsf, syfB, acpP
  1. a presence or absence of petF and orf127 in T. oceanica is the result of a gene transfer event
  2. Genes duplicated in the IR are counted once. The increased genome size of T. oceanica can conveniently be explained by an expansion of the IR region. Orf127 and flrn are potential pseudogenes and are listed as additional gene content (+2).