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The major component of senile plaques found in the brains of Alzheimer disease patients is the beta-amyloid peptide, which is derived from a larger amyloid precursor protein (APP). Recently, a number of APP and APP-related proteins have been identified in different organisms and constitute the family of APP proteins. We have isolated several cDNAs encoding an APP-related protein in the nematode Caenorhabditis elegans and have designated the corresponding gene as apl-1. The apl-1 transcripts undergo two forms of posttranscriptional modification: trans-splicing and alternative polyadenylylation. In vitro translation of an apl-1 cDNA results in a protein of approximately the expected size. Similar to the Drosophila, human, and mouse APP-related proteins, APL-1 does not appear to contain the beta-amyloid peptide. Because APP-related proteins seem to be conserved through evolution, the apl-1 gene from C. elegans should be important for determining the normal function of human APP.

apl-1, a Caenorhabditis elegans gene encoding a protein related to the human beta-amyloid protein precursor.