TY - JOUR
T1 - Evolutionary dynamics of cryptophyte plastid genomes
AU - Kim, Jong Im
AU - Moore, Christa E.
AU - Archibald, John M.
AU - Bhattacharya, Debashish
AU - Yi, Gangman
AU - Yoon, Hwan Su
AU - Shin, Woongghi
N1 - Publisher Copyright:
© The Author 2017.
PY - 2017/7/1
Y1 - 2017/7/1
N2 - Cryptophytes are an ecologically important group of largely photosynthetic unicellular eukaryotes. This lineage is of great interest to evolutionary biologists because their plastids are of red algal secondary endosymbiotic origin and the host cell retains four different genomes (host nuclear, mitochondrial, plastid, and red algal nucleomorph). Here, we report a comparative analysis of plastid genomes from six representative cryptophyte genera. Four newly sequenced cryptophyte plastid genomes of Chroomonas mesostigmatica, Ch. placoidea, Cryptomonas curvata, and Storeatula sp. CCMP1868 share a number of features including synteny and gene content with the previously sequenced genomes of Cryptomonas paramecium, Rhodomonas salina, Teleaulax amphioxeia, and Guillardia theta. Our analysis of these plastid genomes reveals examples of gene loss and intron insertion. In particular, the chlB/chlL/chlN genes, which encode light-independent (dark active) protochlorophyllide oxidore-ductase (LIPOR) proteins have undergone recent genelossand pseudogenization in cryptophytes. Comparison of phylogenetic trees based on plastid and nuclear genome data sets showthe introduction, via secondary endosymbiosis, of a red algal derived plastid in a lineage of chlorophyll-c containing algae. This event was followed by additional rounds of eukaryotic endosym-bioses that spread the red lineage plastid to diverse groups such as haptophytes and stramenopiles.
AB - Cryptophytes are an ecologically important group of largely photosynthetic unicellular eukaryotes. This lineage is of great interest to evolutionary biologists because their plastids are of red algal secondary endosymbiotic origin and the host cell retains four different genomes (host nuclear, mitochondrial, plastid, and red algal nucleomorph). Here, we report a comparative analysis of plastid genomes from six representative cryptophyte genera. Four newly sequenced cryptophyte plastid genomes of Chroomonas mesostigmatica, Ch. placoidea, Cryptomonas curvata, and Storeatula sp. CCMP1868 share a number of features including synteny and gene content with the previously sequenced genomes of Cryptomonas paramecium, Rhodomonas salina, Teleaulax amphioxeia, and Guillardia theta. Our analysis of these plastid genomes reveals examples of gene loss and intron insertion. In particular, the chlB/chlL/chlN genes, which encode light-independent (dark active) protochlorophyllide oxidore-ductase (LIPOR) proteins have undergone recent genelossand pseudogenization in cryptophytes. Comparison of phylogenetic trees based on plastid and nuclear genome data sets showthe introduction, via secondary endosymbiosis, of a red algal derived plastid in a lineage of chlorophyll-c containing algae. This event was followed by additional rounds of eukaryotic endosym-bioses that spread the red lineage plastid to diverse groups such as haptophytes and stramenopiles.
KW - Cryptophyte
KW - Horizontal gene transfer
KW - Plastid genome
UR - http://www.scopus.com/inward/record.url?scp=85028437500&partnerID=8YFLogxK
U2 - 10.1093/gbe/evx123
DO - 10.1093/gbe/evx123
M3 - Article
C2 - 28854597
AN - SCOPUS:85028437500
SN - 1759-6653
VL - 9
SP - 1859
EP - 1872
JO - Genome Biology and Evolution
JF - Genome Biology and Evolution
IS - 7
ER -