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Science 31 January 2003:
Vol. 299. no. 5607, pp. 710 - 712
DOI: 10.1126/science.1079694

Reports

Spongiform Degeneration in mahoganoid Mutant Mice

Lin He,1 Xin-Yun Lu,3 Aaron F. Jolly,4 Adam G. Eldridge,2 Stanley J. Watson,3 Peter K. Jackson,2 Gregory S. Barsh,1* Teresa M. Gunn4*

mahoganoid is a mouse coat-color mutation whose pigmentary phenotype and genetic interactions resemble those of Attractin (Atrn). Atrn mutations also cause spongiform neurodegeneration. Here, we show that a null mutation for mahoganoid causes a similar age-dependent neuropathology that includes many features of prion diseases but without accumulation of protease-resistant prion protein. The gene mutated in mahoganoid encodes a RING-containing protein with E3 ubiquitin ligase activity in vitro. Similarities in phenotype, expression, and genetic interactions suggest that mahoganoid and Atrn genes are part of a conserved pathway for regulated protein turnover whose function is essential for neuronal viability.

1 Department of Pediatrics, Department of Genetics, Howard Hughes Medical Institute,
2 Department of Pathology, Stanford University School of Medicine, Stanford, CA 94305, USA.
3 Mental Health Research Institute, University of Michigan School of Medicine, Ann Arbor, MI 48109, USA.
4 Department of Biomedical Sciences, T4 018 VRT, Cornell University, Ithaca, NY 14853, USA.
*   To whom correspondence should be addressed. E-mail: gbarsh{at}cmgm.stanford.edu (G.S.B.); tmg25{at}cornell.edu (T.M.G.)


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