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We describe a pathogenetic mechanism underlying a variant form of the inherited blood disorder alpha thalassemia. Association studies of affected individuals from Melanesia localized the disease trait to the telomeric region of human chromosome 16, which includes the alpha-globin gene cluster, but no molecular defects were detected by conventional approaches. After resequencing and using a combination of chromatin immunoprecipitation and expression analysis on a tiled oligonucleotide array, we identified a gain-of-function regulatory single-nucleotide polymorphism (rSNP) in a nongenic region between the alpha-globin genes and their upstream regulatory elements. The rSNP creates a new promoterlike element that interferes with normal activation of all downstream alpha-like globin genes. Thus, our work illustrates a strategy for distinguishing between neutral and functionally important rSNPs, and it also identifies a pathogenetic mechanism that could potentially underlie other genetic diseases.

Original publication

DOI

10.1126/science.1126431

Type

Journal article

Journal

Science

Publication Date

26/05/2006

Volume

312

Pages

1215 - 1217

Keywords

Binding Sites, Cells, Cultured, Chromatin Immunoprecipitation, Chromosomes, Human, Pair 16, Erythroblasts, GATA1 Transcription Factor, Gene Expression, Gene Expression Profiling, Globins, Haplotypes, Humans, Melanesia, Minisatellite Repeats, Multigene Family, Oligonucleotide Array Sequence Analysis, Polymorphism, Single Nucleotide, Promoter Regions, Genetic, Regulatory Elements, Transcriptional, Transcription, Genetic, alpha-Thalassemia