CDKN2A and early-onset autosomal dominant Alzheimer disease: CDKN2BAS also regulates the expression of CDKN2A, a gene previously shown to be down-regulated in other neurodegenerative disorders, including Alzheimer's disease, suggesting that regulation of CDKN2A expression by CDKN2BAS could also contribute to degeneration of the optic nerve in glaucoma [40].