Reductions in complexity of mitochondrial genomes in lichen-forming fungi shed light on genome architecture of obligate symbioses.
Mol Ecol
; 27(5): 1155-1169, 2018 03.
Article
en En
| MEDLINE
| ID: mdl-29417658
ABSTRACT
Symbioses among co-evolving taxa are often marked by genome reductions such as a loss of protein-coding genes in at least one of the partners as a means of reducing redundancy or intergenomic conflict. To explore this phenomenon in an iconic yet under-studied group of obligate symbiotic organisms, mitochondrial genomes of 22 newly sequenced and annotated species of lichenized fungi were compared to 167 mitochondrial genomes of nonlichenized fungi. Our results demonstrate the first broad-scale loss of atp9 from mitochondria of lichenized fungi. Despite key functions in mitochondrial energy production, we show that atp9 has been independently lost in three different lineages spanning 10 of the 22 studied species. A search for predicted, functional copies of atp9 among genomes of other symbionts involved in each lichen revealed the full-length, presumably functional copies of atp9 in either the photosynthetic algal partner or in other symbiotic fungi in all 10 instances. Together, these data yield evidence of an obligate symbiotic relationship in which core genomic processes have been streamlined, likely due to co-evolution.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Simbiosis
/
Genoma Fúngico
/
Genoma Mitocondrial
/
Líquenes
Idioma:
En
Revista:
Mol Ecol
Asunto de la revista:
BIOLOGIA MOLECULAR
/
SAUDE AMBIENTAL
Año:
2018
Tipo del documento:
Article
País de afiliación:
Estados Unidos