Enhanced crossing over in the second chromosome of &lt;I&gt;Drosophila ananassae&lt;/I&gt;

Moriwaki, Daigoro

doi:10.1266/jjg.16.37

Cited by 23 publications

(18 citation statements)

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“…Males which produced recombinants less than twice the control frequencies, 6.6% for bw-Arc and 2 % for Arc-Pr, were arbitrarily classified as Su carriers and others as Su+ carriers. As seen in Kikkawa (1938) and Moriwaki (1940) presumed En on chromosome 3 and En-II on 2R for male recombination in D. ananassae.. Hinton (1970) mapped an enhancer symbolized E on 3R. The present study demonstrated a new major enhancer designated En (2) -cm located on 2L.…”

Section: Resultssupporting

confidence: 65%

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Enhancer and suppressor system of male recombination in Drosophila ananassae.

Matsuda

Tobari

1983

The Japanese journal of genetics

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Genetic elements controlling male recombination were detected in the autosomes of the two wild strains, L8 and TNG, and a marker stock, b Arc se; bri ru, of Drosophila ananassae.In the L8 strain, a dominant enhancer, En (2) -cm, which acts on both chromosomes 2 and 3 in unison, is located between the b and Arc loci in the left arm of chromosome 2. In addition, a reducer, Ra, of the En(2)-cm is located in the right arm of chromosome 3 of this strain.The action of the reducer is expressed as progressive decrease in recombination frequency with increasing age of male parent.No such single major enhancer was present in the TNG strain. However, each of the three arms, 2L, 2R, and 3R, was found to carry genetic elements which cause male recombination.A suppressor, Su (2) -bs, which almost completely suppresses male recombination in males carrying En (2) -cm, was found in the left arm of chromosome 2, between the bw and Arc loci, of the b Arc se; bri ru stock. This suppressor has no effect on the polygenic enhancers of the TNG strain.

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Section: Resultssupporting

confidence: 65%

“…Moriwaki (1940) concluded that a dominant enhancer (En-II) on the right arm of chromosome 2 was responsible for male recombination. Unfortunately all of their stocks were lost during the Second World War.…”

Section: Introductionmentioning

confidence: 99%

Enhancer and suppressor system of male recombination in Drosophila ananassae.

Matsuda

Tobari

1983

The Japanese journal of genetics

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“…Early linkage maps of the species were constructed by Kikkawa (1938) and Moriwaki (1938Moriwaki ( , 1940. Unfortunately, almost all of the mutant stocks listed on their maps were lost.…”

Section: Ananassae Mapsmentioning

confidence: 99%

Polytene Chromosomal Maps of 11 Drosophila Species: The Order of Genomic Scaffolds Inferred From Genetic and Physical Maps

et al. 2008

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The sequencing of the 12 genomes of members of the genus Drosophila was taken as an opportunity to reevaluate the genetic and physical maps for 11 of the species, in part to aid in the mapping of assembled scaffolds. Here, we present an overview of the importance of cytogenetic maps to Drosophila biology and to the concepts of chromosomal evolution. Physical and genetic markers were used to anchor the genome assembly scaffolds to the polytene chromosomal maps for each species. In addition, a computational approach was used to anchor smaller scaffolds on the basis of the analysis of syntenic blocks. We present the chromosomal map data from each of the 11 sequenced non-Drosophila melanogaster species as a series of sections. Each section reviews the history of the polytene chromosome maps for each species, presents the new polytene chromosome maps, and anchors the genomic scaffolds to the cytological maps using genetic and physical markers. The mapping data agree with Muller's idea that the majority of Drosophila genes are syntenic. Despite the conservation of genes within homologous chromosome arms across species, the karyotypes of these species have changed through the fusion of chromosomal arms followed by subsequent rearrangement events. O NE of the primary strengths of the genus Drosophila as a model system has been the relative ease of generating detailed cytogenetic maps. Indeed, the first definitive mapping of genes to chromosomes Genetics 179: 1601-1655 ( July 2008) was performed in Drosophila melanogaster (Bridges 1916). The subsequent discovery of polytene chromosomes in the salivary glands in this same species (Painter 1934) and their codification into fine-structure genetic/ cytogenetic maps represents perhaps one of the first forays into ''genomics.'' Polytene maps (Bridges 1935;Lefevre 1976) provided an important genetic tool for mapping genes, for detecting genetic diversity within populations, and for inferring phylogenies among related species (Dobzhansky and Sturtevant 1938;Judd et al. 1972;Ashburner and Lemeunier 1976;Lemeunier and Ashburner 1976). Sturtevant and Tan (1937) laid the groundwork for comparative genomics when they established that genes within the chromosomal arms are conserved or syntenic among species. In an insightful melding of the gene mapping and evolutionary studies, H. J. Muller (1940) proposed that the genomes of Drosophila species were subdivided into a set of homologous elements represented by chromosome arms. What Muller (1940) noted, which was subsequently elaborated on by Sturtevant and Novitski (1941), was that the presumed homologs of identified mutant alleles within a chromosome arm of D. melanogaster were also confined to a single arm in other species within the genus where mapping data were available. Using D. melanogaster as a reference, Muller proposed that each of the five major chromosome arms plus the dot chromosome be given a letter designation (A-F) and that this nomenclature be used to identify equivalent linkage groups within the genus.The an...

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“…Male crossing over in Drosophila ananassae occurs spontaneously at meiosis (Moriwaki and Tobari, 1975;, and is controlled by various chromosomal genetic factors (Kikkawa, 1938;Moriwaki, 1940;Hinton, 1970Hinton, , 1983Tobari 1983, 1987;. The observed frequencies of male recombination are higher than those seen in the other species (cf.…”

Section: Introductionmentioning

confidence: 98%

Cytoplasmic suppressor effect on male crossing over in Drosophila ananassae.

Matsuda

1989

The Japanese journal of genetics

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A reciprocal cross difference in the frequency of male recombination was detected in progeny of hybrids between e se; bri vu and Tonga stocks of Drosophila ananassae.A chromosomal enhancer-cytoplasmic suppressor system determining male crossing over in D. ananassae was identified that appeared to be similar to, but distinct from, that described previously by Hinton (1974). The higher the temperature at which males were reared, the less reciprocal cross ratio in the frequency of male recombination was found. The reciprocal cross differences might be explained by a cytoplasmic suppressor of the Tonga stock and a nuclear chromosomal gene(s).This chromosomal gene is dominant for the reducing the frequency of male recombination, and is located on the 2nd chromosome of the Tonga stock.The maternally transmitted cytoplasmic suppressor was maintained by other chromosomal regions (genes) on both 2nd and 3rd chromosomes of the Tonga stock.

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Enhanced crossing over in the second chromosome of <I>Drosophila ananassae</I>

Cited by 23 publications

References 0 publications

Enhancer and suppressor system of male recombination in Drosophila ananassae.

Enhancer and suppressor system of male recombination in Drosophila ananassae.

Polytene Chromosomal Maps of 11 Drosophila Species: The Order of Genomic Scaffolds Inferred From Genetic and Physical Maps

Cytoplasmic suppressor effect on male crossing over in Drosophila ananassae.

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