title: Isolation of developmentally regulated genes in Drosophila melanogaster.
abstract: We used a molecular approach to search for maternally expressed genes in Drosophila melanogaster. The relative merits of differential and competition screens were analyzed in a series of reconstruction experiments using either purified phage plaques or derivative DNA sequences. In the course of this study, we isolated 5 clones whose RNA level varies during early embryogenesis. Three gastrula differential clones, b4, b8 and d3, are present in numerous copies in the genome; clone b4 hybridizes with the copia-like B104 repetitive sequence described by Scherer et al. We also isolated 2 maternally-expressed genes, not previously identified in either classical genetic or similarly molecular-based screens. These clones, b11 and d6, map at cytogenetic positions 98F and 4F respectively, on the polytene chromosome map.
mesh_terms: D000818:Animals; D002874:Chromosome Mapping; D003001:Cloning, Molecular; D004247:DNA / Q000032:analysis / Q000235:genetics; D004331:Drosophila melanogaster / Q000196:embryology / Q000235:genetics*; D005775:Gastrula / Q000502:physiology; D005786:Gene Expression Regulation; D005796:Genes; D009693:Nucleic Acid Hybridization; D012313:RNA / Q000032:analysis / Q000235:genetics*; D012091:Repetitive Sequences, Nucleic Acid; D014158:Transcription, Genetic
chemical_list: D012313:RNA; D004247:DNA