Isolation, Introgression and Genetic Variation in Rock-Wallabies

Briscoe, David A.; Calaby, J. H.; Close, Robert; Maynes, GM; Murtagh, Carolyn E.; Sharman, G. B.

doi:10.1007/978-3-642-68522-4_6

Cited by 39 publications

(48 citation statements)

References 11 publications

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“…Three Thylogale species were examined (this paper and Metcalfe et al, 1998). Three Petrogale chromosomal groups are recognised (Briscoe et al, 1982;Eldridge and Close, 1993), the lateralis/penicillata group (14 taxa), xanthopus group (three species) and brachyotis group (three species). All taxa of the lateralis/ penicillata and xanthopus groups were examined (this paper and Metcalfe et al, 1997Metcalfe et al, , 2002.…”

Section: Discussionmentioning

confidence: 99%

Mapping the distribution of the telomeric sequence (T2AG3)n in the Macropodoidea (Marsupialia) by fluorescence in situ hybridization. II. The ancestral 2n = 22 macropodid karyotype

Metcalfe

Eldridge

Johnston

2007

Cytogenet Genome Res

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In marsupial karyotypes with little heterochromatin, the telomeric sequence (T₂AG₃)_n, is involved in chromosome rearrangements. Here we compare the distribution of the (T₂AG₃)_n sequence in chromosomes recently derived by fusions and other rearrangements (7–0.5 MYBP) with its distribution in chromosomes derived earlier (24–9 MYBP). We have previously shown that the (T₂AG₃)_n sequence is consistently retained during chromosome rearrangements that are recent (7–0.5 MYBP). We suggest that in less recent rearrangements (24–9 MYBP) the pattern observed is initial retention followed by loss or amplification. We also suggest that the presence of interstitial (T₂AG₃)_n sequence is related to the evolutionary status of single chromosomes rather than entire karyotypes.

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Section: Discussionmentioning

confidence: 99%

Mapping the distribution of the telomeric sequence (T2AG3)n in the Macropodoidea (Marsupialia) by fluorescence in situ hybridization. II. The ancestral 2n = 22 macropodid karyotype

Metcalfe

Eldridge

Johnston

2007

Cytogenet Genome Res

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“…Within Petrogale there are three major chromosomal groups (Briscoe et al, 1982;Sharman et al, 1990;Eldridge and Close, 1997), the largest and most widespread being the lateralis/penicillata group. This group contains two complexes, an eastern penicillata complex (eight taxa), and a central/western lateralis complex (six taxa) (Eldridge and Close, 1997).…”

confidence: 99%

Mapping the distribution of the telomeric sequence (T2AG3)n in rock wallabies, Petrogale (Marsupialia: Macropodidae), by fluorescence in situ hybridization

Metcalfe¹,

Eldridge²,

Johnston³

2002

Cytogenet Genome Res

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The distribution of the conserved vertebrate telomeric sequence (T₂AG₃)_n was examined by fluorescence in situ hybridization in the six Petrogale (rock wallabies) taxa of the lateralis complex. As expected, the (T₂AG₃)_n sequence was located at the termini of all chromosomes in all taxa. However, the sequence was also present at several nontelomeric (viz., interstitial and centromeric) sites. The signals identified were associated with either ancient rearrangements involved with the formation of the 2n = 22 plesiomorphic macropodine karyotype or more recent rearrangements associated with karyotypes derived from the 2n = 22 karyotype. Interstitial (T₂AG₃)_n signals identified on chromosomes 3 and 4 in all six species of the lateralis complex and a large centromeric signal identified on chromosome 7 in the five subspecies/races of P. lateralis appear to be related to the more ancient rearrangements. Subsequent chromosome evolution has seen these signals retained, lost, or amplified in different Petrogale lineages. Within the lateralis complex, in two submetacentric chromosome derived by recent centric fusions, the telomeric sequence was identified at or near the centromere, indicating its retention during the fusion process. In the two taxa where chromosome 3 was rearranged via a recent centromeric transposition to become an acrocentric chromosome, the telomeric signal was located interstitially.

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“…Although initially considered rare and usually deleterious among mammals, hybridization has been identified, to varying degrees, in various wild eutherian mammal taxa including cetaceans (Willis et al, 2004), seals (Lancaster et al, 2006;Kingston and Gwilliam, 2007), canids (Vila et al, 2003;Verardi et al, 2006), felids (Pierpaoli et al, 2003;Lecis et al, 2006), leporids (Thulin et al, 2006;MeloFerreira et al, 2007), martens (Kyle et al, 2003) and squirrels (Ermakov et al, 2006;Spiridonova et al, 2006). However, despite many macropodid marsupial species readily hybridizing in captivity (Close and Lowry, 1990), relatively few instances of natural hybridization have been reported in marsupials, with the exception of several parapatric rock-wallaby species (Briscoe et al, 1982;Eldridge et al, 1991;Eldridge and Close, 1992;Bee and Close, 1993). Therefore, increasing our understanding of the occurrence and frequency of hybridization across various mammalian taxa will provide greater insights into its evolutionary and ecological importance.…”

Section: Introductionmentioning

confidence: 99%

Molecular detection of hybridization between sympatric kangaroo species in south-eastern Australia

et al. 2009

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Introgressive hybridization has traditionally been regarded as rare in many vertebrate groups, including mammals. Despite a propensity to hybridize in captivity, introgression has rarely been reported between wild sympatric macropodid marsupials. Here we investigate sympatric populations of western (Macropus fuliginosus) and eastern (Macropus giganteus) grey kangaroos through 12 autosomal microsatellite loci and 626 bp of the hypervariable mitochondrial DNA (mtDNA) control region. M. fuliginosus and M. giganteus within the region of sympatry corresponded, both genetically and morphologically, to their respective species elsewhere in their distributions. Of the 223 grey kangaroos examined, 7.6% displayed evidence of introgression, although no F1 hybrids were detected. In contrast to captive studies, there was no evidence for unidirectional hybridization in sympatric grey kangaroos. However, a higher portion of M. giganteus backcrosses existed within the sample compared with M. fuliginosus. Hybridization in grey kangaroos is reflective of occasional breakdowns in species boundaries, occurring throughout the region and potentially associated with variable conditions and dramatic reductions in densities. Such rare hybridization events allow populations to incorporate novel diversity while still retaining species integrity.

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Isolation, Introgression and Genetic Variation in Rock-Wallabies

Cited by 39 publications

References 11 publications

Mapping the distribution of the telomeric sequence (T<sub>2</sub>AG<sub>3</sub>)<sub>n</sub> in the Macropodoidea (Marsupialia) by fluorescence in situ hybridization. II. The ancestral 2n = 22 macropodid karyotype

Mapping the distribution of the telomeric sequence (T<sub>2</sub>AG<sub>3</sub>)<sub>n</sub> in the Macropodoidea (Marsupialia) by fluorescence in situ hybridization. II. The ancestral 2n = 22 macropodid karyotype

Mapping the distribution of the telomeric sequence (T<sub>2</sub>AG<sub>3</sub>)<sub>n</sub> in rock wallabies, <i>Petrogale</i> (Marsupialia: Macropodidae), by fluorescence in situ hybridization

Molecular detection of hybridization between sympatric kangaroo species in south-eastern Australia

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