HYBRIDIZATION, NATURAL SELECTION, AND EVOLUTION OF REPRODUCTIVE ISOLATION: A 25-YEARS SURVEY OF AN ARTIFICIAL SYMPATRIC AREA BETWEEN TWO MOSQUITO SIBLING SPECIES OF THE<i>Aedes mariae</i>COMPLEX

Urbanelli, Sandra; Porretta, Daniele; Mastrantonio, Valentina; Bellini, Romeo; Pieraccini, Giuseppe; Romoli, Riccardo; Crasta, Graziano; Nascetti, Giuseppe

doi:10.1111/evo.12490

Cited by 20 publications

(25 citation statements)

References 56 publications

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“…Although F1 hybrid males are sterile, F1 hybrid females (from both ♂ mariae × ♀ zammitii and ♂ zammitii × ♀ mariae crosses) are vigorous, fertile, and able to backcross with both parental species, allowing gene introgression between the two species. Our preliminary data using nuclear allozyme markers showed the occurrence of admixed individuals in both species, which supports that backcrosses and introgression actually occur in nature 26 28 29 30 . Third, individuals of Ae.…”

supporting

confidence: 78%

“…zammitii ( Fig. 1 ) 29 . Several features make this study system suitable for analyzing mtDNA introgression across time during a range expansion.…”

mentioning

confidence: 99%

“…mariae is distributed along the western Mediterranean coasts, while Ae. zammitii inhabits the central and eastern coasts 26 27 28 29 . In June 1986, an artificial sympatric area between the two species was originated along the Adriatic Sea coasts by translocating individuals of Ae.…”

mentioning

confidence: 99%

“…mariae and Ae. zammitii is not complete, and persistent hybridization has been observed in the sympatric area across the years 29 . Although F1 hybrid males are sterile, F1 hybrid females (from both ♂ mariae × ♀ zammitii and ♂ zammitii × ♀ mariae crosses) are vigorous, fertile, and able to backcross with both parental species, allowing gene introgression between the two species.…”

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confidence: 99%

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Dynamics of mtDNA introgression during species range expansion: insights from an experimental longitudinal study

Mastrantonio

Porretta

Urbanelli

et al. 2016

Sci Rep

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Introgressive hybridization represents one of the long-lasting debated genetic consequences of species range expansion. Mitochondrial DNA has been shown to heavily introgress between interbreeding animal species that meet in new sympatric areas and, often, asymmetric introgression from local to the colonizing populations has been observed. Disentangling among the evolutionary and ecological processes that might shape this pattern remains difficult, because they continuously act across time and space. In this context, long-term studies can be of paramount importance. Here, we investigated the dynamics of mitochondrial introgression between two mosquito species (Aedes mariae and Ae. zammitii ) during a colonization event that started in 1986 after a translocation experiment. By analyzing 1,659 individuals across 25 years, we showed that introgression occurred earlier and at a higher frequency in the introduced than in the local species, showing a pattern of asymmetric introgression. Throughout time, introgression increased slowly in the local species, becoming reciprocal at most sites. The rare opportunity to investigate the pattern of introgression across time during a range expansion along with the characteristics of our study-system allowed us to support a role of demographic dynamics in determining the observed introgression pattern.

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supporting

confidence: 78%

“…zammitii ( Fig. 1 ) 29 . Several features make this study system suitable for analyzing mtDNA introgression across time during a range expansion.…”

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Dynamics of mtDNA introgression during species range expansion: insights from an experimental longitudinal study

Mastrantonio

Porretta

Urbanelli

et al. 2016

Sci Rep

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“…Hybridization is defined as a successful mating strategy for two species with one or more heritable traits, and is often used in artificial breeding to obtain potentially desirable traits in their offsprings [ 5 , 6 ]. In grouper species, hybridization was firstly achieved between white-spotted green grouper ( E. amblycephalus ) and red grouper ( E. akaara ) [ 7 ].…”

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confidence: 99%

Transcriptome analysis reveals the molecular mechanisms underlying growth superiority in a novel grouper hybrid (Epinephelus fuscogutatus♀ × E. lanceolatus♂)

Sun¹,

Guo²,

Wang³

et al. 2016

BMC Genet

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BackgroundGroupers (Epinephelus spp.) have been widely cultivated in China and South-East Asian countries. As a novel hybrid offspring crossed between E. fuscogutatus♀ and E. lanceolatus♂, Hulong grouper exhibits significant growth superiority over its female parent, which made it a promising farmed species in grouper aquaculture industry in China. Hulong grouper present a good combination of beneficial traits from both parent species, but the molecular mechanisms of its heterosis still remain poorly understood.ResultsBased on RNA sequencing and gene expression profiling, we conducted comparative transcriptome analyses between Hulong grouper and its parents E. fuscoguttatus & E. lanceolatus. Six hundred sixty-two and 5239 differentially expressed genes (DEGs) were identified in the brains and livers, respectively. GO enrichment analysis of these DEGs revealed that metabolic process and catalytic activity were the most enriched GO terms. Further analysis showed the expressions of GnRH1and GnRH3 in the brain, and GH/IGF axis related genes such as IGF-1, IGF-2b, IGFBP-1, IGFBP-2, IGFBP-4 and IGFBP-5a in the liver of the hybrid F1 were significantly up-regulated, which is in accordance with the growth superiority of hybrid grouper. Meanwhile, expressions of genes related to the protein and glycogen synthesis pathway, such as PI3KC, PI3KR, Raptor, EIF4E3, and PP1 were up-regulated, while PYG expression was down-regulated. These changes might contribute to increased protein and glycogen synthesis in the hybrid grouper.ConclusionsWe identified a number of differentially expressed genes such as GnRH1 and GnRH3, and genes involved in GH/IGF axis and its downstream signaling pathways for protein and glycogen synthesis in Hulong Grouper. These findings provided molecular basis underlying growth superiority of hybrid grouper, and comprehensive insights into better understanding the molecular mechanisms and regulative pathways regulating heterosis in fish.Electronic supplementary materialThe online version of this article (doi:10.1186/s12863-016-0328-y) contains supplementary material, which is available to authorized users.

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Morning glory species co-occurrence is associated with asymmetrically decreased and cascading reproductive isolation

et al. 2021

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Hybridization between species can affect the strength of the reproductive barriers that separate those species. Two extensions of this effect are (1) the expectation that asymmetric hybridization or gene flow will have asymmetric effects on reproductive barrier strength and (2) the expectation that local hybridization will affect only local reproductive barrier strength and could therefore alter within‐species compatibility. We tested these hypotheses in a pair of morning glory species that exhibit asymmetric gene flow from highly selfing Ipomoea lacunosa into mixed‐mating Ipomoea cordatotriloba in regions where they co‐occur. Because of the direction of this gene flow, we predicted that reproductive barrier strength would be more strongly affected in I. cordatotriloba than I. lacunosa. We also predicted that changes to reproductive barriers in sympatric I. cordatotriloba populations would affect compatibility with allopatric populations of that species. We tested these predictions by measuring the strength of a reproductive barrier to seed set across the species’ ranges. Consistent with our first prediction, we found that sympatric and allopatric I. lacunosa produce the same number of seeds in crosses with I. cordatotriloba, whereas crosses between sympatric I. cordatotriloba and I. lacunosa are more successful than crosses between allopatric I. cordatotriloba and I. lacunosa. This difference in compatibility appears to reflect an asymmetric decrease in the strength of the barrier to seed set in sympatric I. cordatotriloba, which could be caused by I. lacunosa alleles that have introgressed into I. cordatotriloba. We further demonstrated that changes to sympatric I. cordatotriloba have decreased its ability to produce seeds with allopatric populations of the same species, in line with our second prediction. Thus, in a manner analogous to cascade reinforcement, we suggest that introgression associated with hybridization not only influences between‐species isolation but can also contribute to isolation within a species.

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HYBRIDIZATION, NATURAL SELECTION, AND EVOLUTION OF REPRODUCTIVE ISOLATION: A 25-YEARS SURVEY OF AN ARTIFICIAL SYMPATRIC AREA BETWEEN TWO MOSQUITO SIBLING SPECIES OF THEAedes mariaeCOMPLEX

Cited by 20 publications

References 56 publications

Dynamics of mtDNA introgression during species range expansion: insights from an experimental longitudinal study

Dynamics of mtDNA introgression during species range expansion: insights from an experimental longitudinal study

Transcriptome analysis reveals the molecular mechanisms underlying growth superiority in a novel grouper hybrid (Epinephelus fuscogutatus♀ × E. lanceolatus♂)

Morning glory species co-occurrence is associated with asymmetrically decreased and cascading reproductive isolation

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