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A gain-of-function single nucleotide variant creates a new promoter which acts as an orientation-dependent enhancer-blocker (NG_Capture-C)

ABSTRACT: Many SNVs associated with human traits and genetic diseases are thought to alter the activity of existing regulatory elements. Some SNVs may also create entirely new regulatory elements which change gene expression, but the mechanism by which they do so is largely unknown. Here we show that a single base change in an otherwise unremarkable region of the human alpha-globin cluster creates an entirely new promoter and an associated unidirectional transcript. This SNV downregulates alpha-globin expression causing alpha-thalassaemia. Rather than competing for the activity of the enhancers, the new promoter lying between the α-globin genes and their associated super-enhancer acts as an orientation-dependent boundary element. Together these observations show how both the order and orientation of the fundamental elements of the genome determine patterns of gene expression and support the concept that promoters may act as boundary elements in mammals as in drosophila. Finally, these findings should prompt others to fully evaluate SNVs lying outside of known regulatory elements as causing changes in gene expression by creating new regulatory elements.

ORGANISM(S): Homo sapiens

PROVIDER: GSE159874 | GEO | 2021/03/25

REPOSITORIES: GEO

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A gain-of-function single nucleotide variant creates a new promoter which acts as an orientation-dependent enhancer-blocker (ChIP-seq)

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