Abstract
A cDNA coding for histatin 1 was isolated from a human submandibular-gland library and sequenced. This cDNA was used to probe RNAs isolated from a variety of tissues to investigate tissue-specific regulation and to determine whether histatins might play a role other than in the oral cavity. The same probe was also used for Southern blot analysis of human genomic DNA restricted with various enzymes, and it showed that the genes coding for histatins are on the same chromosome. In situ hybridization of the cDNA probe to metaphase chromosome spreads was performed to determine chromosomal location of the genes for histatins. A genomic fragment isolated using the cDNA probe was also hybridized to chromosome spreads, and the same chromosome was identified. The genes for histatins are located on chromosome 4, band q13. We have shown that three histatin mRNAs are expressed in human parotid and submandibular glands but in none of the other tissues studied. These results suggest that histatins are specific to salivary secretions.
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Selected References
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