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• W2883840743 abstract "Presenilins (Psen1 and Psen2 in mice) are polytopic transmembrane proteins that act in the γ-secretase complex to make intra-membrane cleavages of their substrates, including the well-studied Notch receptors. Such processing releases the Notch intracellular domain, allowing it to physically relocate from the cell membrane to the nucleus where it acts in a transcriptional activating complex to regulate downstream genes in the signal-receiving cell. Previous studies of Notch pathway mutants for Jagged1, Notch2, and Rbpj demonstrated that canonical signaling is a necessary component of normal mouse lens development. However, the central role of Psens within the γ-secretase complex has never been explored in any developing eye tissue or cell type. By directly comparing Psen single and double mutant phenotypes during mouse lens development, we found a stronger requirement for Psen1, although both genes are needed for progenitor cell growth and to prevent apoptosis. We also uncovered a novel genetic interaction between Psen1 and Jagged1. By quantifying protein and mRNA levels of key Notch pathway genes in Psen1/2 or Jagged1 mutant lenses, we identified multiple points in the overall signaling cascade where feedback regulation can occur. Our data are consistent with the loss of particular genes indirectly influencing the transcription level of another. However, we conclude that regulating Notch2 protein levels is particularly important during normal signaling, supporting the importance of post-translational regulatory mechanisms in this tissue." @default.
• W2883840743 created "2018-08-03" @default.
• W2883840743 creator A5004212343 @default.
• W2883840743 creator A5040793735 @default.
• W2883840743 creator A5069325928 @default.
• W2883840743 date "2018-07-01" @default.
• W2883840743 modified "2023-10-16" @default.
• W2883840743 title "Presenilin gene function and Notch signaling feedback regulation in the developing mouse lens" @default.
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• W2883840743 doi "https://doi.org/10.1016/j.diff.2018.07.003" @default.
• W2883840743 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6089524" @default.
• W2883840743 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30059908" @default.
• W2883840743 hasPublicationYear "2018" @default.
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