By David M. Prescott

Mobilephone Biology A entire Treatise V3

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Extra resources for Cell Biology: A Comprehensive Treatise. Gene Expression: The Production of RNAs

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1. Organization of DNA Sequences in Chromosomes 31 Experiments of this kind (reviewed in Thomas et aL, 1973) suggest that between 15 and 30% of D N A from a wide variety of eukaryotic organisms can form folded circular structures. The lengths of the repeated sequences involved are estimated to be between 600 and 6000 nucleotide pairs, their tandem arrangement forming blocks of between 3000 and 150,000 nu­ cleotide pairs in length. It is not clear at present whether all repeated sequence classes can be organized in this way.

This is shown by analyzing frame-shift mutations at points after the initiation signal. In general a single frame-shift mutation near the 5'-end of the mRNA affects all the genes distal to the mutation. There are, therefore, no regions within or between the structural genes of a prokaryotic operon that can "absorb" the effects of a mutation and restore the correct reading frame in the coding regions of distal genes (cf. the "insert" sequences of eukaryotic genes discussed in Section VI,C,2). B.

Whether some of the nonsatellite repeated sequences are also arranged in a tandem manner has not yet been fully resolved. Thomas et aL (1970) found that circles could be produced in main band D N A of the mouse, and that the frequency of formation of these circles did not vary significantly between main band fractions from various posi­ tions in a CsCl density gradient. This constant proportion across the gra­ dient would argue against the possibility that circles are formed solely by the presence of contaminating mouse satellite D N A .

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