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• W2113016920 startingPage "2381" @default.
• W2113016920 abstract "Alternative splicing of HLA-DQB1 exon 4 is allele-dependent and results in variable expression of soluble DQbeta. We have recently shown that differential inclusion of this exon in mature transcripts is largely due to intron 3 variants in the branch point sequence (BPS) and polypyrimidine tract. To identify additional regulatory cis-elements that contribute to haplotype-specific splicing of DQB1, we systematically examined the effect of guanosine (G) repeats on intron 3 removal. We found that the GGG or GGGG repeats generally improved splicing of DQB1 intron 3, except for those that were adjacent to the 5' splice site where they had the opposite effect. The most prominent splicing enhancement was conferred by GGGG motifs arranged in tandem upstream of the BPS. Replacement of a G-rich segment just 5' of the BPS with a series of random sequences markedly repressed splicing, whereas substitutions of a segment further upstream that lacked the G-rich elements and had the same size did not result in comparable splicing inhibition. Systematic mutagenesis of both suprabranch guanosine quadruplets (G(4)) revealed a key role of central G residues in splicing enhancement, whereas cytosines in these positions had the most prominent repressive effects. Together, these results show a significant role of tandem G(4)NG(4) structures in splicing of both complete and truncated DQB1 intron 3, support position dependency of G repeats in splicing promotion and inhibition, and identify positively and negatively acting sequences that contribute to the haplotype-specific DQB1 expression." @default.
• W2113016920 created "2016-06-24" @default.
• W2113016920 creator A5060828765 @default.
• W2113016920 creator A5073131820 @default.
• W2113016920 date "2006-02-15" @default.
• W2113016920 modified "2023-10-16" @default.
• W2113016920 title "Position-Dependent Repression and Promotion of <i>DQB1</i> Intron 3 Splicing by GGGG Motifs" @default.
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• W2113016920 doi "https://doi.org/10.4049/jimmunol.176.4.2381" @default.
• W2113016920 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/16455996" @default.
• W2113016920 hasPublicationYear "2006" @default.
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