EVOLUTION OF NATURAL-POPULATIONS IN THE DROSOPHILA-MELANOGASTER SIGMA VIRUS SYSTEM .1. LANGUEDOC (SOUTHERN FRANCE)
EVOLUTION OF NATURAL-POPULATIONS IN THE DROSOPHILA-MELANOGASTER SIGMA VIRUS SYSTEM .1. LANGUEDOC (SOUTHERN FRANCE)
复制标题
DOI：
10.1007/bf00055233
复制
发表时间：
1990-04-01
期刊：
影响因子：
1.5
通讯作者：
ANXOLABEHERE, D
中科院分区：
文献类型：
--
作者：
FLEURIET, A;PERIQUET, G;ANXOLABEHERE, D
在黑腹果蝇的自然种群中，sigma病毒通常存在于少数个体中。该病毒通过卵巢传播，但不会在苍蝇之间传染。在人群中发现两种病毒类型（I型和II型）。其中之一（II型）更适合于抵抗病毒的等位基因，在苍蝇种群中表现为多态性。先前的观察导致了一种假设，即起源于法国中部的II型病毒可能正在入侵人群。为了验证这一假设，对埃尼多克人进行了研究。观察到两个惊人的现象。II型克隆频率的强烈增加（从0.53到0.91）证实了该地区的入侵。受感染的苍蝇的频率也急剧增加，达到了其他地方从未观察到的水平，这表明Escheredoc应该呈现出一些不寻常的特征。在致病病毒的情况下，必须考虑到这种爆发的流行病学后果。从1983年到1987年，其他病毒特征的重大变化，在Escheredoc人群中也有记录。
In natural populations of Drosophila melanogaster, sigma virus is usually present in a minority of individuals. The virus is transmitted transovarially but is not contagious from fly to fly. Two viral Types (I and II) are found in populations. One of them (Type II) is better adapted to an allele for resistance to the virus, present as a polymorphism in fly populations. Previous observations have led to the hypothesis that a viral Type II originating in central France might be invading populations. The study of Languedoc populations was undertaken to examine this hypothesis. Two striking phenomena were observed. The strong increase in Type II clones frequency (from 0.53 to 0.91) confirmed that there was invasion in this region. The frequency of infected flies also increased dramatically, at levels never observed elsewhere yet, which indicates that Languedoc should present some unusual characteristics. The epidemiological consequences of such a burst, in the case of a pathogenic virus would have to be taken into consideration. Significant changes in other viral characteristics, from 1983 to 1987, in Languedoc populations have also been documented.