scholarly journals Pure species discriminate against hybrids in the Drosophila melanogaster species subgroup

Evolution ◽  
2021 ◽  
Author(s):  
Antonio Serrato‐Capuchina ◽  
Timothy D. Schwochert ◽  
Stephania Zhang ◽  
Baylee Roy ◽  
David Peede ◽  
...  
Keyword(s):  
Drosophila Melanogaster ◽  
Pure Species ◽  
Drosophila Melanogaster Species Subgroup

scholarly journals Pure species discriminate against hybrids in the Drosophila melanogaster species subgroup

2020 ◽  
Author(s):  
Antonio Serrato-Capuchina ◽  
Timothy D. Schwochert ◽  
Stephania Zhang ◽  
Baylee Roy ◽  
David Peede ◽  
...  
Keyword(s):  
Drosophila Melanogaster ◽  
Gene Flow ◽  
Parental Species ◽  
Cuticular Hydrocarbon ◽  
F1 Hybrids ◽  
Sexual Attractiveness ◽  
Pure Species ◽  
Species Pairs ◽  
Fertile Hybrids ◽  
Drosophila Melanogaster Species Subgroup

ABSTRACTIntrogression, the exchange of alleles between species, is a common event in nature. This transfer of alleles between species must happen through fertile hybrids. Characterizing the traits that cause defects in hybrids illuminate how and when gene flow is expected to occur. Inviability and sterility are extreme examples of fitness reductions but are not the only type of defects in hybrids. Some traits specific to hybrids are more subtle but are important to determine their fitness. In this report, we study whether F1 hybrids between two species pairs of Drosophila are as attractive as the parental species. We find that in both species pairs, the sexual attractiveness of the F1 hybrids is reduced and that pure species discriminate strongly against them. We also find that the cuticular hydrocarbon (CHC) profile of the hybrids is intermediate between the parental species. Perfuming experiments show that modifying the CHC profile of the hybrids to resemble pure species improves their chances of mating. Our results show that behavioral discrimination against hybrids might be an important component of the persistence of species that can hybridize.

scholarly journals Genetic Screens for Factors Involved in the Notum Bristle Loss of Interspecific Hybrids Between Drosophila melanogaster and D. simulans

Genetics ◽  
2000 ◽  
Vol 156 (1) ◽  
pp. 269-282
Author(s):  
Toshiyuki Takano-Shimizu
Keyword(s):  
Drosophila Melanogaster ◽  
Interspecific Cross ◽  
Species Variation ◽  
Genetic Screens ◽  
Pure Species ◽  
Epistatic Interactions ◽  
X Chromosomes ◽  
Powerful Means ◽  
Different Populations ◽  
Deficiency Screening

Abstract Interspecific cross is a powerful means to uncover hidden within- and between-species variation in populations. One example is a bristle loss phenotype of hybrids between Drosophila melanogaster and D. simulans, although both the pure species have exactly the same pattern of bristle formation on the notum. There exists a large amount of genetic variability in the simulans populations with respect to the number of missing bristles in hybrids, and the variation is largely attributable to simulans X chromosomes. Using nine molecular markers, I screened the simulans X chromosome for genetic factors that were responsible for the differences between a pair of simulans lines with high (H) and low (L) missing bristle numbers. Together with duplication-rescue experiments, a single major quantitative locus was mapped to a 13F–14F region. Importantly, this region accounted for most of the differences between H and L lines in three other independent pairs, suggesting segregation of H and L alleles at the single locus in different populations. Moreover, a deficiency screening uncovered several regions with factors that potentially cause the hybrid bristle loss due to epistatic interactions with the other factors.

scholarly journals Correction: Evolution of Eye Morphology and Rhodopsin Expression in the Drosophila melanogaster Species Subgroup

PLoS ONE ◽  
2012 ◽  
Vol 7 (7) ◽  
Author(s):  
Nico Posnien ◽  
Corinna Hopfen ◽  
Maarten Hilbrant ◽  
Margarita Ramos-Womack ◽  
Sophie Murat ◽  
...  
Keyword(s):  
Drosophila Melanogaster ◽  
Eye Morphology ◽  
Drosophila Melanogaster Species Subgroup

scholarly journals Gap genes are involved in inviability in hybrids between Drosophila melanogaster and D. santomea

2021 ◽  
Author(s):  
Wenhan Chang ◽  
Martin Kreitman ◽  
Daniel R. Matute
Keyword(s):  
Drosophila Melanogaster ◽  
Gene Network ◽  
Developmental Process ◽  
Coding Region ◽  
Pure Species ◽  
Closely Related Species ◽  
Hybrid Inviability ◽  
Gap Gene ◽  
Gap Genes ◽  
Anterior Posterior

ABSTRACTEvolved changes within species lead to the inevitable loss of viability in hybrids. Inviability is also a convenient phenotype to genetically map and validate functionally divergent genes and pathways differentiating closely related species. Here we identify the Drosophila melanogaster form of the highly conserved essential gap gene giant (gt) as a key genetic determinant of hybrid inviability in crosses with D. santomea. We show that the coding region of this allele in D. melanogaster/D. santomea hybrids is sufficient to cause embryonic inviability not seen in either pure species. Further genetic analysis indicates that tailless (tll), another gap gene, is also involved in the hybrid defects. giant and tll are both members of the gap gene network of transcription factors that participate in establishing anterior-posterior specification of the dipteran embryo, a highly conserved developmental process. Genes whose outputs in this process are functionally conserved nevertheless evolve over short timescales to cause inviability in hybrids.

scholarly journals Molecular evolution of the duplicated Amy locus in the Drosophila melanogaster species subgroup: concerted evolution only in the coding region and an excess of nonsynonymous substitutions in speciation.

Genetics ◽  
1995 ◽  
Vol 141 (1) ◽  
pp. 223-236
Author(s):  
H Shibata ◽  
T Yamazaki
Keyword(s):  
Drosophila Melanogaster ◽  
Concerted Evolution ◽  
Sequence Data ◽  
Coding Region ◽  
Nucleotide Sequence Data ◽  
Nonsynonymous Substitutions ◽  
Specialist Species ◽  
Duplicated Loci ◽  
Flanking Regions ◽  
Drosophila Melanogaster Species Subgroup

Abstract From the analysis of restriction maps of the Amy region in eight sibling species belonging to the Drosophila melanogaster species subgroup, we herein show that the patterns of duplication of the Amy gene are almost the same in all species. This indicates that duplication occurred before speciation within this species subgroup. From the nucleotide sequence data, we show a strong within-species similarity between the duplicated loci in the Amy coding region. This is in contrast to a strong similarity in the 5' and 3' flanking regions within each locus (proximal or distal) throughout the species subgroup. This means that concerted evolution occurred only in the Amy coding region and that differentiated evolution between the duplication occurred in the flanking regions. Moreover, when comparing the species, we also found a significant excess of nonsynonymous substitutions. In particular, all the fixed substitutions specific to D. erecta were found to be nonsynonymous. We thus conclude that adaptive protein evolution occurred in the lineage of D. erecta that is a "specialist" species for host plants and probably also occurs in the process of speciation in general.

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