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Título

Genomic mosaicism confirms the complex hybrid origin of unisexuality in Calligrapha (Coleoptera: Chrysomelidae)

AutorMontelongo, Tinguaro CSIC; Gómez-Zurita, Jesús CSIC ORCID
Fecha de publicaciónfeb-2013
Citación2nd BioSyst.EU (2013)
ResumenIt is well established that unisexuality has a polyphyletic origin and that it may arise following dif- ferent mechanisms, whereby interspecific hybridization is the most common in animals. Calligrapha (Coleoptera: Chrysomelidae) includes six known tetraploid unisexual species hypothesized to be the result of independent interspecific hybridization events between two bisexual species, based on the observed incongruence between nuclear and mitochondrial phylogenies. However, as this type of incongruence can arise due to other evolutionary processes, this mechanism must be confirmed. If unisexuality in Calligrapha is related to hybrid origins, the expectation is that these species will exhibit high nuclear heterozygosity due to genomic coexistence of alleles from their respective divergent parental species. Moreover, these alleles will be phylogenetically divergent among them and closer to their respective original genetic stock. To assert this point, we have studied genetic diversity for two single-copy nuclear genes (HtS and Wg) via cloning in 15 individuals of four unisexual ( C. apicalis, C. suturella, C. vicina and C. virginea ) and 22 individuals of six bisexual species of Calligrapha . For each individual an average of 16 clones were sequenced. As expected, the highest nuclear heterozygosities were found in unisexual species and phylogenetic analyses showed these divergent alleles to be related to different bisexual spe- cies, unambiguously identified as the parental species. These results confirmed the original hypothesis about hybridization associated to the origins of unisexuality in Calligrapha , but they also contributed an unexpected twist to this hypothesis. In most cases, the nuclear stocks for these divergent alleles are dif- ferent from the one supplying with the mtDNA of every unisexual lineage, implying that at least three bisexual species were involved in the evolutionary path leading to C. suturella and C. virginea and possi- bly four in the case of C. apicalis (with three divergent sources of nuclear alleles, different from the donor of mtDNA). The origin of unisexuality in Calligrapha appears thus as a complex process where a series of successive hybridization events and involving different bisexual species may have taken place.
DescripciónTrabajo presentado en el 2nd BioSyst.EU (BioSyst.EU 2013 Global systematics!), celebrado en Viena del 18 al 22 de febrero de 2013.
URIhttp://hdl.handle.net/10261/154012
Aparece en las colecciones: (IBE) Comunicaciones congresos




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