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The mouse homolog of PKD1: sequence analysis and alternative splicing

C Löhning¹, U Nowicka, A M Frischauf

¹Imperial Cancer Research Fund, Molecular Analysis of Mammalian Mutation, Lincoln's Inn Fields, London WC2A 3PX, UK.

Mammalian Genome : Official Journal of the International Mammalian Genome Society

|May 1, 1997

Abstract:

We have cloned and sequenced the mouse transcript homologous to human polycystic kidney disease 1 (PKD1). The predicted protein is 79% identical to human PKD1 and shows the presence of most of the domains identified in the human sequence. Since the mouse homolog is transcribed from a unique gene and there are no transcribed, closely related copies as has been observed for human PKD1, we have been able to investigate alternative splicing of the transcript. At the junction of exons 12 and 13, several different splicing variants lead to a predicted protein that would be secreted. These forms are predominantly found in newborn brain, while in kidney the transcript homologous to the previously described human RNA predominates.

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Alternative RNA splicing is the regulated splicing of exons and introns to produce different mature mRNAs from a single pre-mRNA. Unlike in constitutive splicing where a single gene produces a single type of mRNA, alternative splicing allows an organism to produce multiple proteins from a single gene and plays an important role in protein diversity.
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...

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