Ceroid-lipofuscinosis (Batten's disease): pathogenesis and sequential neuropathological changes in the ovine model.

A sequential morphological study of ovine ceroid-lipofuscinosis showed that brains of affected lambs were normal at birth, grew until four months of age but then atrophied. Laminar necrosis of cerebral cortex was noted at 10 weeks, occurring first in the parietal area, then spreading to involve frontal and occipital areas while the temporal lobe was least and last affected. With progression of the disease, the laminar pattern was lost. Neuronal necrosis was accompanied by a severe astrocytosis. The granular and multilamellar storage cytosomes increased in size with age. Their structure was interpreted as paracrystalline in which repeating molecules of the dominantly stored lipid binding subunit of mitochondrial ATP synthase interact with neutral lipids and phospholipids. Abnormal cytosomes in neurons of lamb fetuses and a neonate were interpreted as early lesions which contained whorls or stacks of bilayered membrane as well as the more complex multilamellar material. The underlying anomaly leading to the storage of the lipid binding subunit of mitochondrial ATPsynthase remains to be defined. However, it is noted that this disease should be regarded as a lipid binding protein proteinosis or alternatively as a proteolipid proteinosis.