Isolation of Homologous Nuclear Dnas from Sea-Urchin Embryos

Author:

BAKER R. F.1

Affiliation:

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

Abstract

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.

Publisher

The Company of Biologists

Subject

Cell Biology

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