The fate of polymorphic inversions of Drosophila melanogaster transferred to laboratory conditions.

Inoue, Yutaka

doi:10.1266/jjg.54.83

Cited by 39 publications

(42 citation statements)

References 22 publications

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“…The average frequency of the four common cosmopolitan inversions decreased drastically in these cages in accordance with the previous observation (Inoue, 1979) except for four cases (cages 8 and 13 for 2Lt and cages 16 and 17 for 2RNS). The first two cases seem to be accidental because the replicate cages (cages 7 and 14) showed the decrease ofinversions.…”

Section: Elimination Ofpolymorphic Inversions In Cage Populationssupporting

confidence: 92%

“…Figures 1 and 2 visualize the results presented in Tables 1 and 2. 0.05 (Inoue, 1979 (Inoue et aI., 1984). This cage was completely inversion-free when examined after 168, 288, and 552 generations (Fig.…”

Section: Elimination Ofpolymorphic Inversions In Cage Populationsmentioning

confidence: 99%

“…Similarly, using D. ananassae, Tobari and Kojima (1967) and Kojima and Tobari (1969) showed that inversion frequencies eventually reached an equilibrium. On the other hand, Inoue (1979) using D. melanogaster found that all kinds of polymorphic inversions were rapidly eliminated from cage populations.…”

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CHROMOSOMAL POLYMORPHISM IN ISOFEMALE LINES AND CAGE POPULATIONS OFDROSOPHILA MELANOGASTER

Inoue

Watanabe

1992

Evolution

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Abstract. -Drosophila melanogaster populations in nature usually carry inversion polymorphisms. When they were transferred to and maintained in the laboratory as large cage populations, frequencies of polymorphic inversions were drastically decreased and finally eliminated. This "cage effect" was observed irrespective of the geographical origin ofthe population or the initial frequency of each inversion. The decrease and elimination of inversions in the cage was not overcome by changing conditions such as medium, temperature, or the number of isofemale lines (40-600) introduced. On the other hand, in the sets of isofemale lines derived from the same geographical origins as the cage populations, each of which was maintained as a small vial population, the inversion frequencies, though decreased from the initial frequencies, were kept at significantly high levels. The cage populations initiated with one or two isofemale lines also maintained the inversion polymorphisms that were as high as vial populations. Natural populations of many Drosophila species are known to be chromosomally polymorphic, the paracentric inversions being the most common (Roberts, 1976). Once the natural populations carrying such polymorphic inversions are transferred to the laboratory and maintained in cages with several thousand flies, they show significant changes in the frequency of inversion chromosomes. Dobzhansky and Pavlovsky (1953) reported gradual changes of inversion frequencies and eventual equilibrium of each inversion in D. pseudoobscura populations. Similarly, using D. ananassae, Tobari and Kojima (1967) and Kojima and Tobari (1969) showed that inversion frequencies eventually reached an equilibrium. On the other hand, Inoue (1979) using D. melanogaster found that all kinds of polymorphic inversions were rapidly eliminated from cage populations.In the present report, we first confirmed the previous observation that inversion polymorphisms were eliminated from cage populations, and then examined various parameters so as to maintain inversion frequencies in laboratory conditions. It was found that inversion polymorphisms were maintained if the populations were kept as the sets of isofemale lines. Moreover, individual isofemale lines in most cases maintained inversion polymorphisms in small vials or even in large population cages. Possible mechanisms for the maintenance of chromosome polymorphisms in natural populations are discussed. MATERIALS AND METHODSD. melanogaster wild flies were collected by sweeping nets or banana traps in various localities (see Tables 1, 2, 5, and 6). Females inseminated in nature were individually kept in glass vials (3 em diameter x 10 em height) to establish isofemale lines. These lines were maintained by mass transfer of about 20-60 flies every 15 days at 25°C. In some experiments flies that were made homozygous for the second chromosomes were employed. These chromosomes were extracted from the natural population by using balanced lethal chromosome stocks with dominant markers, SM] (Cy)/Pm.The cage...

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Section: Elimination Ofpolymorphic Inversions In Cage Populationssupporting

confidence: 92%

Section: Elimination Ofpolymorphic Inversions In Cage Populationsmentioning

confidence: 99%

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CHROMOSOMAL POLYMORPHISM IN ISOFEMALE LINES AND CAGE POPULATIONS OFDROSOPHILA MELANOGASTER

Inoue

Watanabe

1992

Evolution

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“…The idea that variable selection in space is maintaining genetic diversity can be tested by placing flies in a constant laboratory environment. Loss of inversion polymorphism has certainly been observed in cage populations of D. melanogaster (e.g., Inoue 1979). In contrast, a recent laboratory natural selection experiment in D. subobscura showed that although chromosome inversion frequencies consistently shifted according to experimental temperature, every one of the replicated population cages maintained all the initial chromosomal diversity, namely, a total of 16 polymorphic gene arrangements (5 in chromosome O) segregating in the five major chromosomes (Santos et al 2005a).…”

Section: Discussionmentioning

confidence: 99%

Recombination Load in a Chromosomal Inversion Polymorphism of Drosophila subobscura

Santos

2009

Genetics

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Chromosomal inversions suppress recombination in heterokaryotypes and may help to maintain positive epistatic interactions among groups of alleles at loci contained in the inversion. Here I evaluate the protective effect of inversions on recombination when different chromosomal segments, or even the whole chromosome O of Drosophila subobscura, can be effectively prevented from undergoing recombination in several naturally occurring heterokaryotypes. The fitness of flies made homozygous for recombinant chromosomes was generally lower when compared to their nonrecombinant counterparts, thus suggesting that segregating gene arrangements in this species hold together favorable combinations of alleles that interact epistatically.

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“…Some authors (I NOUE , 1979 ;I NOUE et al , 1984) find that when natural populations are transferred to laboratory cages and maintained for a long time, they lose the chromosomal polymorphism but retain stable enzyme polymorphism. In the wild/multichromosomal population in a normal medium, the presence of the In(2L)t was not detected.…”

Section: Introductionmentioning

confidence: 99%

Polymorphisms of inversions and Adh alleles in eye colour mutant experimental populations of Drosophila melanogaster

Nájera¹,

Ménsua²

1987

Genetics Selection Evolution

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SummaryFrom laboratory populations (wild/se ; wild/sf ; wild/cd and wild/multichromosomal) originated from strains coming from a cellar and using two culture media, one standard and the other supplemented with 10 p. 100 ethanol, strong heterosis was observed. It has been confirmed that this heterosis cannot be explained by the maintenance of inversions in heterozygosis and that there is a fixation of the F allele in all the populations supplemented with ethanol while all the populations maintained in the standard culture medium remain polymorphic.

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The fate of polymorphic inversions of Drosophila melanogaster transferred to laboratory conditions.

Cited by 39 publications

References 22 publications

CHROMOSOMAL POLYMORPHISM IN ISOFEMALE LINES AND CAGE POPULATIONS OFDROSOPHILA MELANOGASTER

CHROMOSOMAL POLYMORPHISM IN ISOFEMALE LINES AND CAGE POPULATIONS OFDROSOPHILA MELANOGASTER

Recombination Load in a Chromosomal Inversion Polymorphism of Drosophila subobscura

Polymorphisms of inversions and Adh alleles in eye colour mutant experimental populations of Drosophila melanogaster

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