Abstract
From a genomic library constructed from an EcoRI digest of Wistar rat brain DNA, we isolated a clone (BL-1) that gave a 0.6-kilobase restriction fragment only in brain (or lens) DNA upon Southern hybridization. The tissue-specific fragment was present in Wistar and other strains (Sprague-Dawley and Donryu) of rats regardless of their sex and age. Sequencing of the clone indicated that it is closely related to a part of the LINE 3 sequence, one of the highly repetitive sequences present throughout mammalian genomes. Polymerase chain reaction using primer sequences in the BL-1 clone indicated that it is derived from an amplified (rear-ranged) sequence, although other explanations are possible. These results suggest that there are tissue-specific changes in DNA primary structure during mammalian developmental processes.
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