All these data, plus the finding that gp82-mediated penetration of metacyclic forms was associated with disrupted HeLa cell cytoskeletal architecture, indicate that gp82 promotes parasite invasion by disassembling the cortical actin cytoskeleton.
A clustering analysis identified five highly validated clusters containing sequences modulated during appressorium-mediated penetration of the host.
We identified a subset of sequences that specifically accumulated or were repressed during appressorium-mediated penetration of the host.
We characterized biological stages, ranging from the appressorium-mediated penetration of the pathogen into the roots to the occurrence of first dead cells in the plant.
Information is therefore required concerning the molecular events occurring during the appressorium-mediated penetration of the host root system by oomycetes.
Interestingly, 2864 sequences (61%) and 2987 sequences (64%) were expressed in purified appressoria and during the appressorium-mediated penetration of A. thaliana roots (2.5 hai), respectively.
We selected 58 sequences from the six clusters containing sequences with expression modulated during the appressorium-mediated penetration of the host (clusters I, II, III, IV, V and VI; red on Figure 1).
Targeted mutation of Atg8 in M. grisea arrested conidial cell death via autophagy and prevented production of penetration hyphae, thus, preventing appressoria-mediated penetration of the host cuticle [ 45].
However, the existence of Pls1 in the human ascomycete pathogen Coccidioides posadasii, in saprotrophic fungiand in symbiotic basidiomycetes such as ectomycorrhiza suggests that Pls1 plays other cellular roles than appressorium-mediated penetration of host tissues since these fungi do not differentiate appressoria.
Other approaches are either based on receptor-mediated penetration of BBB, such as by coupling recombinant enzymes with transferrin and using transferrin receptor-mediated endocytosis for transport across the BBB (Osborn et al, 2008), or on invasive procedures, like intratechal ERT (Munoz-Rojas et al, 2008).
Sequences specifically accumulating during the appressorium-mediated penetration of the host plant (purified appressoria, A. thaliana 2.5 hai, 6 hai and 10.5 hai, clusters I and VI) were highly enriched in cell wall-degrading enzymes (CWDEs, Additional file 6: Table S5_I and Additional file 7: Table S5_VI).
