Faithful segregation of replicated chromosomes is essential for maintenance of genetic stability and seems to be monitored by several mitotic checkpoints. Various components of these checkpoints have been identified in mammals, but their physiological relevance is largely unknown. Here we show that mutant mice with low levels of the spindle assembly checkpoint protein BubR1 develop progressive aneuploidy along with a variety of progeroid features, including short lifespan, cachectic dwarfism, lordokyphosis, cataracts, loss of subcutaneous fat and impaired wound healing. Graded reduction of BubR1 expression in mouse embryonic fibroblasts causes increased aneuploidy and senescence. Male and female mutant mice have defects in meiotic chromosome segregation and are infertile. Natural aging of wild-type mice is marked by decreased expression of BubR1 in multiple tissues, including testis and ovary. These results suggest a role for BubR1 in regulating aging and infertility.

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Pigment dispersion syndrome results from idiopathic atrophy of the pigment layers of the iris with liberation of pigment, which is carried forward and deposited along the routes of aqueous flow. Iris atrophy may result in characteristic transillumination of the iris near its base.Pigment is usually present on the posterior capsule of the lens at the site of insertion of the posterior zonular fibres into the ligamentum hyaloideum capsulare. It may be minimal and punctate or dense and confluent in a single or double ring. The zonular fibres may have a bronzelike appearance.' Pigment on the posterior surface of the cornea takes the form of a Krukenberg spindle, with additional punctate or dust-like deposits frequently present on the peripheral corneal endothelium and on the surface of an otherwise normal appearing iris stroma. Pigmentation of the posterior trabeculum is consistently quite dense.