Patterns of ionic current through Drosophila follicles and eggs.

Abstract:

:Large steady electrical currents traverse Drosophila follicles in vitro as well as permeabilized eggs. During the period of main follicle growth (stages 9-11), these currents enter the anterior or nurse cell end of the follicles. This inward current acts like a sodium ion influx with some calcium involvement. During the period of chorion formation (stages 12-14), foci of inward current also appear at the posterior, posterodorsal, and anterodorsal regions of follicles in vitro. In stage 14, the posterior in current acts like a chloride ion efflux. In preblastoderm eggs substantial currents continue to enter their anterior end; while weaker and less frequent ones enter their posterior end. We present models in which the currents during follicle growth are driven by the plasma membrane of the oocyte nurse cell syncitium; the external currents during choriogenesis are driven by the follicular epithelium; while the currents through the preblastoderm egg are driven by its plasma membrane. Measurements of pole-to-pole resistances and voltages across preblastoderm eggs indicate that the transcellular currents normally maintain a steady extracellular voltage gradient along the perivitelline space, with the anterior pole kept negative by perhaps 4 or 5 mV. The developmental significance of these currents is discussed.

journal_name

Dev Biol

journal_title

Developmental biology

authors

Overall R,Jaffe LF

doi

10.1016/0012-1606(85)90013-2

subject

Has Abstract

pub_date

1985-03-01 00:00:00

pages

102-19

issue

1

eissn

0012-1606

issn

1095-564X

pii

0012-1606(85)90013-2

journal_volume

108

pub_type

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