Genetics of sexual isolation between two sibling species, Drosophila simulans and Drosophila mauritiana.

SummarySexual isolation between the sibling species D. simulans and D. mauritiana is due largely to the rejection of D. simulans males by D. mauritiana females. Genetic analysis shows that genes on the X and third chromosomes contribute to the differences between males causing sexual isolation, while the Y chromosome, second chromosome and cytoplasm have no effect. These chromosome effects differ from those observed in a previous analysis of sexual isolation in hybrid females, implying that different genes cause sexual isolation in the two sexes.

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GENETIC DISTANCE IN THE SIBLING SPECIES DROSOPHILA MELANOGASTER, DROSOPHILA SIMULANS AND DROSOPHILA MAURITIANA

Evolution ◽

10.1111/j.1558-5646.1982.tb05071.x ◽

1982 ◽

Vol 36 (3) ◽

pp. 517-522 ◽

Cited By ~ 30

Author(s):

A. M. González ◽

V. M. Cabrera ◽

J. M. Larruga ◽

A. Gullón

Keyword(s):

Drosophila Melanogaster ◽

Genetic Distance ◽

Sibling Species ◽

Drosophila Simulans ◽

Drosophila Mauritiana

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Sequence analysis of active mariner elements in natural populations of Drosophila simulans.

Genetics ◽

10.1093/genetics/130.3.499 ◽

1992 ◽

Vol 130 (3) ◽

pp. 499-506 ◽

Cited By ~ 1

Author(s):

P Capy ◽

A Koga ◽

J R David ◽

D L Hartl

Keyword(s):

Sibling Species ◽

Natural Populations ◽

Drosophila Simulans ◽

Position Effects ◽

Nucleotide Variability ◽

Active Elements ◽

Dosage Effects ◽

Drosophila Mauritiana ◽

Laboratory Populations ◽

Regulatory Effects

Abstract Active and inactive mariner elements from natural and laboratory populations of Drosophila simulans were isolated and sequenced in order to assess their nucleotide variability and to compare them with previously isolated mariner elements from the sibling species Drosophila mauritiana and Drosophila sechellia. The active elements of D. simulans are very similar among themselves (average 99.7% nucleotide identity), suggesting that the level of mariner expression in different natural populations is largely determined by position effects, dosage effects and perhaps other factors. Furthermore, the D. simulans elements exhibit nucleotide identities of 98% or greater when compared with mariner elements from the sibling species. Parsimony analysis of mariner elements places active elements from the three species into separate groups and suggests that D. simulans is the species from which mariner elements in D. mauritiana and D. sechellia are most likely derived. This result strongly suggests that the ancestral form of mariner among these species was an active element. The two inactive mariner elements sequenced from D. simulans are very similar to the inactive peach element from D. mauritiana. The similarity may result from introgression between D. simulans and D. mauritiana or from selective constraints imposed by regulatory effects of inactive elements.

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Genetic Distance in the Sibling Species Drosophila melanogaster, Drosophila simulans and Drosophila mauritiana

Evolution ◽

10.2307/2408097 ◽

1982 ◽

Vol 36 (3) ◽

pp. 517 ◽

Cited By ~ 16

Author(s):

A. M. Gonzalez ◽

V. M. Cabrera ◽

J. M. Larruga ◽

A. Gullon

Keyword(s):

Drosophila Melanogaster ◽

Genetic Distance ◽

Sibling Species ◽

Drosophila Simulans ◽

Drosophila Mauritiana

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A Quantitative Genetic Analysis of Male Sexual Traits Distinguishing the Sibling Species Drosophila simulans and D. sechellia

Genetics ◽

10.1093/genetics/153.4.1683 ◽

1999 ◽

Vol 153 (4) ◽

pp. 1683-1699 ◽

Cited By ~ 11

Author(s):

Stuart J Macdonald ◽

David B Goldstein

Keyword(s):

Genetic Analysis ◽

Sibling Species ◽

Reproductive Traits ◽

Drosophila Simulans ◽

Directional Selection ◽

Posterior Lobe ◽

Sex Comb ◽

Tooth Number ◽

Comb Tooth ◽

Shape And Size

Abstract A quantitative trait locus (QTL) genetic analysis of morphological and reproductive traits distinguishing the sibling species Drosophila simulans and D. sechellia was carried out in a backcross design, using 38 markers with an average spacing of 8.4 cM. The direction of QTL effects for the size of the posterior lobe was consistent across the identified QTL, indicating directional selection for this trait. Directional selection also appears to have acted on testis length, indicating that sexual selection may have influenced many reproductive traits, although other forms of directional selection cannot be ruled out. Sex comb tooth number exhibited high levels of variation both within and among isofemale lines and showed no evidence for directional selection and, therefore, may not have been involved in the early speciation process. A database search for genes associated with significant QTL revealed a set of candidate loci for posterior lobe shape and size, sex comb tooth number, testis length, tibia length, and hybrid male fertility. In particular, decapentaplegic (dpp), a gene known to influence the genital arch, was found to be associated with the largest LOD peak for posterior lobe shape and size.

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