The promoter of a lysosomal membrane transporter gene, CTNS, binds Sp-1, shares sequences with the promoter of an adjacent gene, CARKL, and causes cystinosis if mutated in a critical region.
Phornphutkul C, Anikster Y, Huizing M, Braun P, Brodie C, Chou JY, Gahl WA. Am J Hum Genet. 2001 Oct; 69(4):712-21. Epub 2001 Aug 14.