Genome size and «C-heterochromatic-DNA» in man and the african apes |
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Authors: | C Pellicciari E Ronchetti D Formenti R Stanyon M G Manfredi Romanini |
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Institution: | (1) Dipartimento di Biologia Animale and Centro di Studio per l'Istochimica del CNR, University of Pavia, Italy;(2) Instituto di Antropologia Fisica, University of Genova, Italy;(3) Dipartimeto di Biologia Animale and Centro di Studio per l'Istochimica del CNR, University of Pavia, Italy |
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Abstract: | The genome sizes and the amounts of DNA after C-banding pretreatments (C-heterochromatic DNA) were measured by quantitative cytochemical methods in man and the African apes,Gorilla gorilla andPan troglodytes. As evaluated by flow cytometry on propidium-iodide-stained lymphocytes, gorilla and chimpanzee have genome sizes larger
than man. On the basis of the different resistance of metaphase chromosome DNA to the C-banding procedure, two genome compartments
were defined, i.e.,C-heterochromatic-DNA andeuchromatic-DNA. The latter proved to be fairly constant in man and the African apes (as well as in two hylobatid species), whereas the variable
amounts ofC-heterochromatic-DNA account well for the interspecific differences of genome size among the hominoid species studied so far. During karyotype
diversification, quantitative changes (with either gains or losses) ofC-heterochromatic-DNA seem to have taken place independently in the hylobatid and the man/African ape lineages. |
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Keywords: | Hominoidea C-heterochromatin genome size flow cytometry |
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