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Journal of Cell Science, Vol 11, 153-171, Copyright © 1972 by Company of Biologists

Submitted on January 4, 1972

Isolation of Homologous Nuclear Dnas from Sea-Urchin Embryos

R. F. BAKER 1

1 Department of Biological Sciences, University of Southern California, Los Angeles, California 90007, U.S.A.

Studies are presented on the ability of low-molecular-weight nuclear DNA fractions to hybridize to higher-molecular-weight nuclear DNAs taken from different stages of early developing sea-urchin embryos, Strongylocentrotus purpuratus. Using preparative DNA-DNA hybridization, a fraction of 6o-s mid-blastula DNA was isolated for its ability to anneal to 10-s morula DNA. Approximately 80 regions on each 6o-s molecule were found to be homologous to 10-s DNA. High-molecular-weight (> 240-s) nuclear DNA from mesenchyme blastula stage and later stages (compared with DNA from pre-blastula nuclei) shows an increase in the number of regions homologous to fractions of 10- and 60-s DNAs.

Submitted on January 4, 1972






© The Company of Biologists Ltd 1972