12 results on '"Auffray, J. - C."'
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2. Spontaneous occurrence of a Robertsonian fusion involving chromosome 19 by single whole-arm reciprocal translocation (WART) in wild-derived house mice
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Catalan, J., Auffray, J.-C., Pellestor, F., and Britton-Davidian, J.
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- 2000
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3. Abstracts of papers presented at
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Or, R., Fishler, G., Kehat, M., Chen, CH., Klein, Z., Dunkelblum, E., Gothilf, S., Muszkat, LEA, Melamed-madjar, VENEZIA, Yathom, SHOSHANA, Halperin, J., Mendel, Z., Bonneh, O., Saphir, NITZA, Golan, Y., Madar, Z., Moore, I., Snir, R., Harpaz, I., Mazor, MICHAL, Becker, D., Kimmel, T., Cyjon, R., Cosse, A., Wysoki, M., Hefetz, A., Graur, D., La-france, DALIA, Shani, A., Ravid, U., Ideses, RUT, Soroker, VICTORIA, Rafaeli, ADA, Nevo, E., Heth, G., Beiles, A., and Auffray, J. C. more...
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- 1987
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4. Adaptation and plasticity in insular evolution of the house mouse mandible.
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Renaud, S. and Auffray, J.-C.
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RODENTS , *PHENOTYPIC plasticity , *MAMMALS , *MURIDAE , *GENOTYPE-environment interaction - Abstract
Morphometric methods allow the quantification of directions of phenotypic changes and their statistical comparison in a morphometric space. We applied this approach to investigate several candidate factors to explain changes in mandible shape occurring in house mice ( Mus musculus domesticus, Mammalia, Rodentia) in Corsica and a nearby islet. The role of niche widening and of the concomitant change in diet was evaluated by comparing the micro-evolutionary insular change to the macro-evolutionary difference between omnivorous and herbivorous rodents. Phenotypic plasticity, which may contribute to rapid insular evolution, was assessed by breeding laboratory mice on hard versus soft food. The related change in mandible shape was compared with differences between continental and insular populations. The role of allometry was evaluated by assessing shape change related to size within the continental population and comparing this direction of change with differences on islands. Finally, evolution may be facilitated along the direction of the greatest phenotypic variance. This hypothesis was tested by computing in wild populations vectors corresponding to this direction and by comparing these vectors with those corresponding to estimates of shape changes related to plasticity, micro- and macro-evolutionary processes. In Corsica, the congruence in directions of macro- and micro-evolutionary phenotypic vectors (Corsican/continental mice versus omnivorous/herbivorous rodents) supports the hypothesis of adaptation in mandible shape evolution. By contrast, on the islet, phenotypic divergence follows directions of plastic response to food consistency as well as within-population allometry. Thus, results suggest differences in the relative importance of processes which may influence rodent mandibular shape depending on the size of the islands they colonized. Faster evolution and plasticity may be more evident in small and often ephemeral populations living on small islands, whereas micro-evolutionary processes may have enough time and genetic variability to progressively ‘align’ with macro-evolutionary trends in large populations from big islands. [ABSTRACT FROM AUTHOR] more...
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- 2010
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5. Patterns of genic diversity and structure in a species undergoing rapid chromosomal radiation: an allozyme analysis of house mice from the Madeira archipelago.
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Britton-Davidian, J., Catalan, J., Lopez, J., Ganem, G., Nunes, A. C., Ramalhinho, M. G., Auffray, J. C., Searle, J. B., and Mathias, M. L.
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BIODIVERSITY ,ISOENZYMES ,GENETICS ,CHROMOSOMES ,MICE - Abstract
The chromosomal radiation of the house mouse in the island of Madeira most likely involved a human-mediated colonization event followed by within-island geographical isolation and recurrent episodes of genetic drift. The genetic signature of such processes was assessed by an allozyme analysis of the chromosomal races from Madeira. No trace of a decrease in diversity was observed suggesting the possibility of large founder or bottleneck sizes, multiple introductions and/or a high post-colonization expansion rate. The Madeira populations were more closely related to those of Portugal than to other continental regions, in agreement with the documented human colonization of the island. Such a Portuguese origin contrasts with a study indicating a north European source of the mitochondrial haplotypes present in the Madeira mice. This apparent discrepancy may be resolved if not one but two colonization events took place, an initial north European introduction followed by a later one from Portugal. Asymmetrical reproduction between these mice would have resulted in a maternal north European signature with a nuclear Portuguese genome. The extensive chromosomal divergence of the races in Madeira is expected to contribute to their genic divergence. However, there was no significant correlation between chromosomal and allozyme distances. This low apparent chromosomal impact on genic differentiation may be related to the short time since the onset of karyotypic divergence, as the strength of the chromosomal barrier will become significant only at later stages.Heredity (2007) 99, 432–442; doi:10.1038/sj.hdy.6801021; published online 4 July 2007 [ABSTRACT FROM AUTHOR] more...
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- 2007
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6. Species delimitation in the Acomys cahirinus– dimidiatus complex (Rodentia, Muridae) inferred from chromosomal and morphological analyses.
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VOLOBOUEV, V., AUFFRAY, J. C., DEBAT, V., DENYS, C., GAUTUN, J. C., and TRANIER, M.
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MURIDAE , *CHROMOSOME analysis , *CHROMOSOMES , *ANIMAL morphology , *ANIMAL classification , *RODENTS - Abstract
Our earlier chromosome banding studies of Acomys cahirinus and Acomys dimidiatus (the latter long considered to be a subspecies of the former) revealed that, despite very close diploid numbers (36 vs. 38), these taxa possess sharply different karyotypes and undoubtedly belong to different species. In this context, the taxonomic status and the relationship between the two chromosomal forms in Sinai (2 n = 36) and Israel (2 n = 38), chromosomally homozygous across a vast range except for a very narrow hybrid zone, remain poorly documented. Neither of these forms have previously been studied by chromosome banding; thus, the exact nature of chromosomal differences as well as the species to which these forms should be assigned remain unknown. Here, we present the data on comparative G-banding analysis and morphometrics of Acomys from Israel, Sinai, and Saudi Arabia, and a hybrid obtained in laboratory crosses between latter two. The analysis revealed that karyotype of Acomys from Israel is identical to that of Acomys from Saudi Arabia and both are different from that of Acomys from Sinai by one Robertsonian fusion. Therefore, karyotypically, all three are very different from A. cahirinus. It follows from the study that Sinai and probably Arabian peninsula and Minor Asia must be excluded from geographical distribution of A. cahirinus, which is limited from West Sahara to Egypt along Nile river (except Sinai). Furthermore, the synthesis of chromosomal and recent molecular data suggests a phylogeographical scenario explaining the modern distribution of Acomys in the Sinai and Arabian peninsulas and permits the update of the taxonomic status of these populations. © 2007 The Linnean Society of London, Biological Journal of the Linnean Society, 2007, 91, 203–214. [ABSTRACT FROM AUTHOR] more...
- Published
- 2007
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7. Effects of climate on oxygen consumption and energy intake of chromosomally divergent populations of the House Mouse ( Mus musculus domesticus) from the island of Madeira (North Atlantic, Portugal).
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Mathias, M. L., Nunes, A. C., Marques, C. C., Auffray, J.-C., Britton-Davidian, J., Ganem, G., Gündüz, I., Ramalhinho, M. G., Searle, J. B., and Speakman, J. R.
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MICE ,OXYGEN ,CLIMATOLOGY ,METABOLISM ,INGESTION ,BODY weight ,TEMPERATURE ,CLIMATE & biogeography - Abstract
1. We explored the effects of climatic variables (mean altitude, mean daily winter temperature, mean daily summer temperature, mean annual precipitation and days of precipitation per year) on energetic parameters (food intake and resting oxygen consumption) in six Robertsonian chromosomal races and hybrid populations of House Mice (Mus musculus domesticus) collected throughout the island of Madeira in the North Atlantic. 2. Food energy intake and resting metabolism (oxygen consumption) were measured, in 59 non-reproducing adult males trapped in April–September 1998 and June 1999 and maintained in captivity for at least 3 weeks prior to measurements. 3. Mean daily energy intake of Robertsonian mice varied between 25·3 kJ day
−1 in race S. Vicente (2 n = 25–27) and 34·6 kJ day−1 in race Achadas da Cruz (2 n = 24–27), while in hybrids (2 n = 22 × 2 n = 40) it was 23·0 kJ day−1 . All races exhibited low resting rates of oxygen consumption compared with the predicted basal metabolic rates expected for Muridae, between 49·2% and 66·5% of the expected values. 4. The main factor influencing both food energy intake and oxygen consumption was body mass, explaining 41% of the variation in food energy intake and 39% of the variation in resting oxygen consumption. Body mass was significantly related to the mean summer temperature at the sites where the mice were captured, but was unaffected by the chromosomal race or other biogeographical and climatic variables. There were no additional effects of these factors on resting oxygen consumption beyond the effect of body mass. 5. Once the effects of body mass were removed, food energy intake was significantly correlated with the chromosomal race. The different environmental conditions experienced by the races may have favoured the physiological adaptation of mice to different habitats. [ABSTRACT FROM AUTHOR] more...- Published
- 2006
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8. Two deeply divergent mitochondrial clades in the wild mouse Mus macedonicus reveal multiple glacial refuges south of Caucasus.
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Orth, A., Auffray, J.-C., and Bonhomme, F.
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MICE , *ANIMAL genetics - Abstract
A survey of 77 individuals covering the range of Mus macedonicus from Georgia in the East to Greece and Bulgaria in the West and Israel in the South has shown the existence of two deeply divergent mitochondrial clades. The southern clade was until now undetected and characterises mice from Israel. Nuclear genes also show some amount of regional differentiation tending to separate the southern M. macedonicus from the northern ones. These results point towards the fact that the eastern Mediterranean short-tailed mouse, which was seen as a fairly homogeneous monotypic species, has in fact a more complex phylogeographic history than has been suspected, and that it warrants the existence of two subspecies. The reasons for this non-uniformity probably ought to be looked for in the history of faunal movements linked to glacial periods, underlining the possible existence of at least two refugia south of the Caucasus. [ABSTRACT FROM AUTHOR] more...
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- 2002
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9. Molecular studies on the colonization of the Madeiran archipelago by house mice.
- Author
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GÜndüz, İ., Auffray, J.-C., Britton-Davidian, J., Catalan, J., Ganem, G., Ramalhinho, M. G., Mathias, M. L., and Searle, J. B.
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MICE , *MITOCHONDRIA , *COLONIZATION - Abstract
Abstract To study the colonization history of the house mouse (Mus musculus domesticus) on the Madeiran archipelago, complete mitochondrial D-loop sequences were obtained for 44 individuals from Madeira, Porto Santo and Ilhas Desertas. Altogether, 19 D-loop haplotypes were identified which formed part of a single clade in a phylogeny incorporating haplotypes from elsewhere in the range of M. m. domesticus, indicating that the Madeiras were colonized from a single source. Similarities between the sequences found in the Madeiras and those in Scandinavia and northern Germany suggest that northern Europe was the source area, and there is the intriguing possibility that the Vikings may have accidentally brought house mice to the archipelago. However, there is no record of Vikings visiting the Madeiras; on historical grounds, Portugal is the most likely source area for Madeiran mice and further molecular data from Portugal are needed to rule out that possibility. [ABSTRACT FROM AUTHOR] more...
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- 2001
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10. Developmental Stability in House Mice Heterozygous for Single Robertsonian Fusions.
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Auffray, J.-C. and Fontanillas, P.
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MICE , *CHROMOSOMAL translocation , *GENETICS - Abstract
Assesses the developmental stability in parental homozygous races as well as in hybrids of the house mouse and the extent of disruption induced by a single balanced translocation. Results of the Levene's test on fluctuating asymmetry; Significance of the contrasting results of heterozygosity for one versus many Robertsonian fusions; Difference in hybrid developmental stability between the Belgian and Tunisian chromosomal races. more...
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- 2001
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11. THE EVOLUTION OF HOUSE MICE.
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Boursot, P., Auffray, J.-C., Britton-Davidian, J., and Bonhomme, F.
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PHYLOGENY , *GENETICS , *PALEONTOLOGY , *COMMENSALISM , *CHROMOSOMES - Abstract
In the light of available paleontological, genetic, and ecological data, we attempt to reconstruct the natural history of the house mouse (Mus musculus) and to justify a systematics. The house mouse is the most recent phylogenetic offshoot of the genus Mus. Its present components result from a radiation that took place most probably in the north of the Indian subcontinent about 0.5 MYA. The different colonization paths into the rest of Eurasia led to the present day subspecies: M. m. domesticus in western Erurope and the Mediterranean basin, M. m. musculus from central Europe to northern China, and M. m. castaneus in southeast Asia. The central populations remain very polymorphic and are not attributable to any of these subspecies; the status of M. m. bactrianus is unclear. This radiation led to a mosaic evolution of the different parts of the genome in these subspecies. The expansion to the periphery of the Eurasian range, and more recently to the rest of the world, is related to human activity. In the case of M. m. domesticus commensalisms apparently started with human sedentism in the Fertile Crescent, but its extension to the western Meditteranean basin occurred only after Neolithic times. The recent expansion has produced zones of secondary contact at the periphery of the continent. For instance, in Europe M. m. domesticus and M. m. musculus have formed a narrow hybrid zone where selection prevents the introgression of sex chromosomes. M. m. musculus and M. m. castaneus have extensively mixed in the Japanese archipelago, and intergrade in central China. The house mouse thus offers a series of replicates of the process of geographic speciation. Commensalism with humans has modified the population structure mainly through fragmentation of populations and high local densities. Possibly in relation to this way of life, M. m. domesticus has evolved many populations with various combinations of Robertsonian translocations, a choice model to study stasipatric speciation. Finally its commensalisms has led to its domestication in the form of laboratory strains, which have a polyphyletic origin. [ABSTRACT FROM AUTHOR] more...
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- 1993
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12. The Evolution of House Mice.
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Boursot, P, Auffray, J C, Britton-Davidian, J, and Bonhomme, F
- Published
- 1993
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