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Sequence of a cDNA clone encoding mouse glial fibrillary acidic protein: structural conservation of intermediate filaments.
Abstract
A clone encoding mouse glial fibrillary acidic protein (GFAP) was isolated from a cDNA library constructed so as to express the cloned sequences. The library was screened using a GFAP-specific polyclonal antiserum; a single bacterial colony expressing GFAP was identified. The complete sequence of the cDNA insert in this clone is presented, encompassing 2.5 kilobases and specifying greater than 97% of the GFAP amino acid sequence. The clone includes a long (1.4-kilobase) 3' untranslated region. Within the coding region, the data show extensive homology with other intermediate filament proteins, particularly in those regions predicted to be alpha-helical. RNA blot transfer experiments using the cloned GFAP cDNA probe revealed a single GFAP mRNA species of 2.7 kilobases in mouse brain. Southern blot analysis indicates the existence of at most two genes encoding GFAP in the mouse genome. The mouse GFAP probe cross-hybridizes weakly at high stringency with genomic DNA from diverse eukaryotic species.
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