Abstract:
:Germ line transformation has been used to map the cis regulatory DNA elements responsible for the precise and evolutionarily stable developmental expression of the s18 chorion gene. Constructs containing chimeric combinations of Drosophila melanogaster and D. grimshawi DNA regions, as well as D. grimshawi sequences alone, can direct expression in the follicular epithelium, in an s18-specific temporal and spatial pattern. The results indicate that both positive and negative regulatory elements can function when transferred from D. grimshawi to D. melanogaster. The first ca. 100 bp of the 5'-flanking DNA region constitute a minimal, developmentally regulated promoter, expression of which is inhibited by the next 100-bp DNA segment and activated by positive elements located further upstream. Expression of the minimal promoter can also be enhanced by more distant chorion regulatory elements, provided the inhibitory DNA segment is absent.
journal_name
Dev Bioljournal_title
Developmental biologyauthors
Swimmer C,Kashevsky H,Mao G,Kafatos FCdoi
10.1016/0012-1606(92)90160-isubject
Has Abstractpub_date
1992-07-01 00:00:00pages
103-12issue
1eissn
0012-1606issn
1095-564Xpii
0012-1606(92)90160-Ijournal_volume
152pub_type
杂志文章abstract::Trophoblast cells are characterized by an invasive behavior into the surrounding uterine tissue. In rodents, an early peri-/endovascular type of invasion exerted by trophoblast giant cells can be distinguished from a late interstitial type carried out by glycogen trophoblast cells. Analysis of the molecular mechanisms...
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