Abstract
Two female-specific repeating DNA units of 0.6 kilobase pairs (kb) and 1.1 kb, produced by digesting the genomic DNA of the White Leghorn chicken with Xho I, were cloned by inserting them into the Xho I site of an Escherichia coli plasmid vector pACYC177. Two such recombinant plasmids, pAGD0601 and pAGD1101, containing a single 0.6-kb and 1.1-kb sequence, respectively, were used as molecular probes. In situ hybridization of the 3Hprobes to the metaphase chromosomes from the female White Leghorn embryos revealed their localization in the W chromosome. Semiquantitative Southern blot hybridization with 32P-probes in excess indicated that the 0.6-kb unit and 1.1-kb unit were repeated approximately 14,000 and 6,000 times, respectively, in the W chromosome. The two units comprised about 46% of the W chromosomal DNA. These two repeating units were found in the female genomes of every line of Gallus g. domesticus tested and in the female genomes of three jungle fowl species (G. gallus, G. sonneratii, and G. varius) but not in three species belonging to other genera in the suborder Galli. Hha I sites in the 0.6-kb and 1.1-kb repeating units were shown to be extensively methylated and a significant fraction of the Hpa II sites in the 0.6-kb repeating units were also shown to be methylated in the female genome of the White Leghorn. Methylation patterns of Hpa II sites in or around the 0.6-kb repeating units examined by the Msp I digestion were similar in the various lines of domestic fowls and the two species of jungle fowls, but G. varius (black or green jungle fowl) produced a different pattern of digestion with Msp I.
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Tone, M., Sakaki, Y., Hashiguchi, T. et al. Genus specificity and extensive methylation of the W chromosome-specific repetitive DNA sequences from the domestic fowl, Gallus gallus domesticus . Chromosoma 89, 228–237 (1984). https://doi.org/10.1007/BF00295004
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DOI: https://doi.org/10.1007/BF00295004