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Pseudoexons occur frequently in the human genome. This paper characterizes a pseudoexon in the GH receptor gene. Inappropriate activation of this pseudoexon causes Laron syndrome. Using in vitro splicing assays, pseudoexon silencing was shown to require a combination of a weak 5' pseudosplice-site and splicing silencing elements within the pseudoexon. Immunoprecipitation experiments showed that specific binding of heterogenous nuclear ribonucleoprotein E1 (hnRNP E1) and U1 small nuclear ribonucleoprotein (snRNP) in the pre-spliceosomal complex was associated with silencing of pseudoexon splicing. The possible role of hnRNP E1 was further supported by RNA interference experiments in cultured cells. Immunoprecipitation experiments with three other pseudoexons suggested that pre-spliceosomal binding of U1 snRNP is a potential general mechanism of suppression of pseudoexons.

molecular endocrinology

Pre-Spliceosomal Binding of U1 Small Nuclear Ribonucleoprotein (RNP) and Heterogenous Nuclear RNP E1 Is Associated with Suppression of a Growth Hormone Receptor Pseudoexon