1887

Abstract

The endogenous retrovirus is controlled by the gene (). New insertions of occur in any individual if its mother is homozygous for the permissive allele and contains functional proviruses. The ovaries of females also contain high amounts of RNAs. Unexpectedly however, derepression does not occur in the female germline proper but in the somatic follicular epithelium of the ovary. Since extracts from these females are able to efficiently infect the germ-line of a strain devoid of active proviruses, we assume that a similar kind of germ-line infection, which would occur inside the females themselves, could be required for insertions to occur in their progeny. This hypothesis was confirmed by electron microscopy observations showing that non-enve-loped intracytoplasmic particles containing RNAs accumulate in the apical region of the follicle cells, close to specific membrane domains to which the envelope proteins are targeted, whereas both are absent in the controls. Low amounts of similar virus-like particles were also observed in oocytes, but it is not yet known whether they entered passively or as a result of membrane fusion. This is the first report of the beginning of a retrovirus cycle in invertebrates and these observations should be taken into account when explaining the maternal effect of the gene on the multiplication of proviruses.

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1997-09-01
2024-04-19
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