Passage:
Recent genomic sequencing of Asgard archaea inhabiting deep-sea hydrothermal vent sediments has provided crucial empirical evidence regarding the origins of eukaryotic cellular complexity. Unlike all previously characterized prokaryotes, Asgard archaea possess functional genes encoding proteins structurally analogous to eukaryotic actin filaments and endosomal sorting complexes. Evolutionary biologists initially hypothesized that eukaryotic progenitor cells acquired these complex structural proteins exclusively after the primary endosymbiotic engulfment of an alpha-proteobacterium—the event that gave rise to mitochondria.
However, the presence of these 'eukaryotic signature proteins' (ESPs) in uncultivated Asgard lineages demonstrates that the structural machinery required for membrane remodeling and cellular engulfment evolved prior to mitochondrial acquisition. Crucially, phylogenetic analyses indicate that while Asgard lineages possess ESPs, they lack the specific lipid synthesis pathways necessary to construct the ester-linked phospholipid membranes characteristic of eukaryotes, retaining instead the ether-linked isoprenoid membranes typical of archaea. Consequently, researchers infer that the transition from ether-linked to ester-linked membrane chemistry occurred after the primitive host cell established stable endosymbiosis with the mitochondrial ancestor, rather than during the initial structural diversification of pre-eukaryotic archaea.
Based on the premises in the passage, evaluate whether the following statement is True or False:
"The evolutionary development of membrane remodeling machinery in the ancestral host lineage preceded the chemical transition from ether-linked to ester-linked membrane lipids."
Cevap: Cevap