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CUL4B ubiquitin ligase in mouse development:A model for human X-linked mental retardation syndrome?
Yongchao Zhao1 and Yi Sun1
1Division of Radiation and Cancer Biology, Department of Radiation Oncology, University of Michigan, 4424B MS-1, 1301 Catherine Street, Ann Arbor, MI 48109, USA
Correspondence:Yi Sun,Tel: 734-615-1989;Fax:734-763-1581
CUL4B, a member of the cullin-RING ubiquitin ligase family, is frequently mutated in X-linked mental retardation (XLMR) patients. The study by Liu et al. showed that Cul4b plays an essential developmental role in the extra-embryonic tissues, while it is dispensable in the embryo proper during mouse embryogenesis. Viable Cul4b-null mice provide the first animal model to study neuronal and behavioral deficiencies seen in human CUL4B XLMR patients.