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Photoreversible inhibition by ultraviolet light of germ line development in Smittia sp. (Chironomidae, Diptera).

Abstract：

:Pole cell formation in embryos of the parthenogenetic midge, Smittia sp., can be delayed or inhibited by irradiation of the posterior egg pole with ultraviolet light (uv). This leaves the schedule of nuclear divisions and chromosome eliminations virtually unaffected. However, uv irradiation delays the precocious migration to the posterior pole of one nucleus, which normally becomes included in the first pole cell. This effect is photoreversible, i.e., mitigated by application of blue light after uv. Photoreversibility indicates that a nucleic acid component is involved as an effective target. During normal development of Smittia a number of chromosomes are eliminated during mitosis V, not only from somatic nuclei but also in the germ line. In the latter, this mitosis takes place during the first gonial division in the larva. After uv irradiation, the first pole cell nucleus has undergone supernumerary mitoses before pole cell formation and, as a result, is driven into mitosis V precociously as the pole cell divides. This is frequently associated with chromosome elimination from pole cells, which in turn is correlated with subsequent disappearance of already formed pole cells. Adults derived from embryos without pole cells do not form ovaries. Pole cell formation, pole cell preservation, and ovary development are separately inhibited by uv, and inhibition of each step is photoreversible. The results are discussed in the context of germ cell determination, protection against chromosome elimination, and the role of chromosomes limited to the germ line.

journal_name

Dev Biol

journal_title

Developmental biology

authors

von Brunn A,Kalthoff K

doi

10.1016/0012-1606(83)90236-1

subject

Has Abstract

pub_date

1983-12-01 00:00:00

pages

426-39

issue

2

eissn

0012-1606

issn

1095-564X

pii

0012-1606(83)90236-1

journal_volume

100

pub_type

杂志文章

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