Open AccessOrganelle inheritance and genome architecture variation in isogamous brown algae
Author(s) -
Jin-Tak Choi,
Louis Graf,
Akira F. Peters,
J. Mark Cock,
Koki Nishitsuji,
Asuka Arimoto,
Eiichi Shoguchi,
Chikako Nagasato,
Chang Geun Choi,
Hwan Su Yoon
Publication year - 2020
Publication title -
scientific reports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.24
H-Index - 213
ISSN - 2045-2322
DOI - 10.1038/s41598-020-58817-7
Subject(s) - biology , genome , mitochondrial dna , plastid , non mendelian inheritance , evolutionary biology , genetics , inheritance (genetic algorithm) , nuclear gene , lineage (genetic) , gene , chloroplast
Among the brown algal lineages, Ectocarpales species have isogamous fertilization in which male and female gametes are morphologically similar. In contrast, female gametes are much larger than male gametes in the oogamous species found in many other brown algal lineages. It has been reported that the plastids of isogamous species are biparentally inherited whereas the plastids of oogamous species are maternally inherited. In contrast, in both isogamous and oogamous species, the mitochondria are usually inherited maternally. To investigate whether there is any relationship between the modes of inheritance and organellar genome architecture, we sequenced six plastid genomes (ptDNA) and two mitochondrial genomes (mtDNA) of isogamous species from the Ectocarpales and compared them with previously sequenced organellar genomes. We found that the biparentally inherited ptDNAs of isogamous species presented distinctive structural rearrangements whereas maternally inherited ptDNAs of oogamous species showed no rearrangements. Our analysis permits the hypothesis that structural rearrangements in ptDNAs may be a consequence of the mode of inheritance.