Abstract:
:Copy number variations (CNVs) often include noncoding sequences and putative enhancers, but how these rearrangements induce disease is poorly understood. Here we investigate CNVs involving the regulatory landscape of IHH (encoding Indian hedgehog), which cause multiple, highly localized phenotypes including craniosynostosis and synpolydactyly. We show through transgenic reporter and genome-editing studies in mice that Ihh is regulated by a constellation of at least nine enhancers with individual tissue specificities in the digit anlagen, growth plates, skull sutures and fingertips. Consecutive deletions, resulting in growth defects of the skull and long bones, showed that these enhancers function in an additive manner. Duplications, in contrast, caused not only dose-dependent upregulation but also misexpression of Ihh, leading to abnormal phalanges, fusion of sutures and syndactyly. Thus, precise spatiotemporal control of developmental gene expression is achieved by complex multipartite enhancer ensembles. Alterations in the composition of such clusters can result in gene misexpression and disease.
journal_name
Nat Genetjournal_title
Nature geneticsauthors
Will AJ,Cova G,Osterwalder M,Chan WL,Wittler L,Brieske N,Heinrich V,de Villartay JP,Vingron M,Klopocki E,Visel A,Lupiáñez DG,Mundlos Sdoi
10.1038/ng.3939subject
Has Abstractpub_date
2017-10-01 00:00:00pages
1539-1545issue
10eissn
1061-4036issn
1546-1718pii
ng.3939journal_volume
49pub_type
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