An unexpectedly large and loosely packed mitochondrial genome in the charophycean green alga Chlorokybus atmophyticus

Table 3 Conservation of gene order in streptophyte mitochondrial genomes

Compared genomes	No. of conserved gene clusters^a	No. of genes in clusters/no. of shared genes^b	Similarity index^c	No. of reversals^d
Chara/Physcomitrella	10	59/64	9.2	12
Chaetosphaeridium/Physcomitrella	10	40/62	6.5	26
Marchantia/Physcomitrella	14	59/65	6.5	14
Chaetosphaeridium/Chara	12	43/65	5.5	28
Chara/Marchantia	16	58/67	5.4	20
Chaetosphaeridium/Marchantia	15	46/65	4.7	27
Chlorokybus/Physcomitrella	8	20/61	4.1	47
Chlorokybus/Chaetosphaeridium	9	22/65	3.8	49
Chlorokybus/Chara	9	21/65	3.6	51
Mesostigma/Physcomitrella	2	4/61	3.3	57
Chlorokybus/Marchantia	10	21/66	3.2	51
Mesostigma/Chaetosphaeridium	2	4/65	3.1	60
Mesostigma/Chara	2	4/65	3.1	61
Mesostigma/Marchantia	2	4/65	3.1	60
Chlorokybus/Mesostigma	2	4/66	3.0	63

^a A conserved gene cluster is defined here as a suite of genes/gene pieces with the same order and polarities in the pair of compared genomes.
^b The ratio of these two values represents the fraction of shared genes/gene pieces found in conserved clusters.
^c This value was obtained by dividing the percentage of shared genes/gene pieces found in conserved clusters by the number of conserved clusters.
^d GRIMM was used to infer the numbers of reversals required to transform gene order in the compared genomes.

ISSN: 1471-2164