Neurofibromatosis type 1

Neurofibromatosis 1 (NF1) is an autosomal dominant neurocutaneous disorder with an incidence of similar to1 in 4000. Cognitive deficits and academic l earning difficulties are the most common neurological 'complication' of NF1 in childhood and can be responsible for significant lifetime morbidity. Th e NF1 gene is usually classified as a tumor suppressor gene, but it is not yet known how NF1 gene mutations cause many of the non-tumor manifestations of the disorder. The NF1 protein, neurofibromin is expressed early during embryonic development with high levels of expression in the brain, suggesti ng that it plays an important role in regulating the orderly differentiatio n of central nervous system neurons. The mouse model for NF1 demonstrates b ehavioral abnormalities which bear striking similarity to the cognitive phe notype observed in humans with NF1. This review summarises our current unde rstanding of the function of the NF1 gene, the nature of cognitive deficits in this disorder and correlations between neuroradiological, pathological and neuropsychological findings and animal studies which provide an insight into the pathogenesis. (C) 2000 Wiley-Liss, Inc.