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• W2135582045 endingPage "1130" @default.
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• W2135582045 abstract "The paternally expressed extra-large stimulatory G protein gene (XLalphas) is a splice variant of the stimulatory G-protein gene (Gsalpha) consisting of XL-exon1 and exons 2-13 of Gsalpha. A second open reading frame (ORF) in XL-exon1, that completely overlaps the XL-domain ORF, encodes ALEX, which is translated from the XLalphas mRNA and binds the XL-domain of XLalphas. We previously demonstrated that a paternally inherited functional polymorphism in XL-exon1, consisting of a 36 bp insertion and two nucleotide substitutions, is associated with Gs hyperfunction in platelets, leading to an increased trauma-related bleeding tendency and is accompanied by neurological problems and brachydactyly in two families. Here, we describe eight additional patients with brachydactyly, who inherited the same XLalphas polymorphism paternally and who show Gs hyperfunction in their platelets and fibroblasts. All carriers also have an elongated ALEX protein, as a consequence of the paternally inherited insertion. The in vitro interaction between the two elongated XLalphas and ALEX proteins is markedly reduced. Moreover, XLalphas or ALEX can be co-immunoprecipitated with an antibody against either ALEX or XLalphas in platelets from a control but hardly from patients with the XLalphas/ALEX insertion. In contrast to the strong interaction between the two wild-type proteins, we suggest that this defective association results in unimpeded receptor-stimulated activation of XLalphas. The paternally inherited double XLalphas/ALEX functional polymorphism is also associated with elevated platelet membrane Gsalpha protein levels. Both phenomena contribute to increased Gs signaling in patients with platelet hypersensitivity towards Gs-agonists and may be accompanied by neurological problems or growth deficiency." @default.
• W2135582045 created "2016-06-24" @default.
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• W2135582045 date "2003-05-15" @default.
• W2135582045 modified "2023-09-26" @default.
• W2135582045 title "Functional polymorphisms in the paternally expressed XLalphas and its cofactor ALEX decrease their mutual interaction and enhance receptor-mediated cAMP formation" @default.
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• W2135582045 doi "https://doi.org/10.1093/hmg/ddg130" @default.
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