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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Front+Genet
2015 ; 6
(ä): 303
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Evolution of epithelial morphogenesis: phenotypic integration across multiple
levels of biological organization
#MMPMID26483835
Horn T
; Hilbrant M
; Panfilio KA
Front Genet
2015[]; 6
(ä): 303
PMID26483835
show ga
Morphogenesis involves the dynamic reorganization of cell and tissue shapes to
create the three-dimensional body. Intriguingly, different species have evolved
different morphogenetic processes to achieve the same general outcomes during
embryonic development. How are meaningful comparisons between species made, and
where do the differences lie? In this Perspective, we argue that examining the
evolution of embryonic morphogenesis requires the simultaneous consideration of
different levels of biological organization: (1) genes, (2) cells, (3) tissues,
and (4) the entire egg, or other gestational context. To illustrate the
importance of integrating these levels, we use the extraembryonic epithelia of
insects-a lineage-specific innovation and evolutionary hotspot-as an exemplary
case study. We discuss how recent functional data, primarily from RNAi
experiments targeting the Hox3/Zen and U-shaped group transcription factors,
provide insights into developmental processes at all four levels. Comparisons of
these data from several species both challenge and inform our understanding of
homology, in assessing how the process of epithelial morphogenesis has itself
evolved.