The genes coding for tRNATyr of Drosophila melanogaster: Localization and determination of the gene numbers

Abstract
Transfer RNATyr (anticodon GΨA) was isolated from Drosophila melanogaster by means of Sepharose 4B, RPC-5, and polyacrylamide gel electrophoresis. The tRNA was iodinated in vitro with Na125I and hybridized in situ to salivary gland chromosomes from Drosophila. The genes of tRNATyr were localized in eight regions of the genome by autoradiography. Restriction enzyme analysis of genomic DNA indicated that the haploid Drosophila genome codes for about 23 tRNATyr genes. The regions 22F and 85A each contain four to five tRNATyr genes, whereas the regions 28C, 41AB, 42A, 42E, and 56D each contain two to three tRNATyr genes.