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Genomic compatibility between two phyllotine rodent species evaluated through their hybrids

Authordc.contributor.authorWalker Bozzo, Laura 
Authordc.contributor.authorRojas, Mariana es_CL
Authordc.contributor.authorFlores Carrasco, Sergio es_CL
Authordc.contributor.authorSpotorno Oyarzún, Ángel es_CL
Authordc.contributor.authorManríquez Soto, Germán Raúl es_CL
Cita de ítemdc.identifier.citationHereditas, Nº 131, 1999. pp. 227-238en_US
Identifierdc.identifier.otherDOI: 10.1111/j.1601-5223.1999.00227.x
General notedc.descriptionArtículo de publicación ISI
Abstractdc.description.abstractIn order to investigate the genomic compatibility between allopatric rodent species, Phyllotis durivini and Pliyllotis mugister, we have studied several cytogenetic and reproductive features of their laboratory hybrids. Of thirty-one pairings between species, only five were successful, producing eleven newborns. Like parents, hybrids had 38 metacentric chromosomes, except for the subtelocentric Y chromosome inherited from P. mugisteu. There was almost total C and G band correspondence between homeologous autosomes. However, parental sex chromosomes had different morphology, C and G bands. Ag-NOR bands appeared as small telomeric Ag+ regions, distributed in four chromosomal pairs of durwini, three of mugister and four homeologous chromosomes of the hybrids. The three forms had similar indexes of NOR activity per cell, in spite of the variability in NOR expression which was always detected. Usually, only one member of parental homologous chromosomes showed AgNOR + ; nevertheless, both homeologous chromosomes were active in many hybrid cells. The frequencies of cells that expressed their ribosomal genes in the two homologous or homeologous NOR chromosomes were similar in parental and hybrid cells. These results strongly suggest that ribosomal genes of both parental genomes would function codominantly in the hybrids. The gonad histological and morphometric analyses showed that hybrids conformed to Haldane's rule, since females were fertile and males were infertile. Our results indicate that P. durwini and P. mugister genomes can function in relative harmony and compatibility when they are placed together in their laboratory generated hybrids, suggesting that these species have few genetic differences, probably because they have recently diverged.en_US
Type of licensedc.rightsAttribution-NonCommercial-NoDerivs 3.0 Chile*
Link to Licensedc.rights.uri*
Keywordsdc.subjectAnimales e insectosen_US
Títulodc.titleGenomic compatibility between two phyllotine rodent species evaluated through their hybridsen_US
Document typedc.typeArtículo de revistaen_US

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Except where otherwise noted, this item's license is described as Attribution-NonCommercial-NoDerivs 3.0 Chile