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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

mu1A-adaptin-deficient mice: lethality, loss of AP-1 binding and rerouting of mannose 6-phosphate receptors.

The heterotetrameric AP-1 complex is involved in the formation of clathrin-coated vesicles at the trans-Golgi network ( TGN) and interacts with sorting signals in the cytoplasmic tails of cargo molecules. Targeted disruption of the mouse mu1A-adaptin gene causes embryonic lethality at day 13. 5. In cells deficient in micro1A-adaptin the remaining AP-1 adaptins do not bind to the TGN. Polarized epithelial cells are the only cells of micro1A-adaptin-deficient embryos that show gamma-adaptin binding to membranes, indicating the formation of an epithelial specific AP-1B complex and demonstrating the absence of additional mu1A homologs. Mannose 6-phosphate receptors are cargo molecules that exit the TGN via AP-1-clathrin-coated vesicles. The steady-state distribution of the mannose 6-phosphate receptors MPR46 and MPR300 in mu1A-deficient cells is shifted to endosomes at the expense of the TGN. MPR46 fails to recycle back from the endosome to the TGN, indicating that AP-1 is required for retrograde endosome to TGN transport of the receptor.[1]


  1. mu1A-adaptin-deficient mice: lethality, loss of AP-1 binding and rerouting of mannose 6-phosphate receptors. Meyer, C., Zizioli, D., Lausmann, S., Eskelinen, E.L., Hamann, J., Saftig, P., von Figura, K., Schu, P. EMBO J. (2000) [Pubmed]
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