Chromosome evolution in marsupials

Rofe, Ruth; Sharp, P. J.

doi:10.1007/978-94-010-9166-4_9

Cited by 12 publications

(10 citation statements)

References 13 publications

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“…Chromosome evolution in marsupials has been shown by G-banding to involve little repatterning other than that of chromosome fusion, fission and inversion. The same G-banding elements and chromosome morphology are shared by Austrailan and American species (Hayman et al, 1987;Rofe and Hayman, 1985). The evidence supports an hypothesis of a basic 2n = 14 XX/XY complement for the group as a whole.…”

Section: Discussionsupporting

confidence: 74%

Further evidence of novel sex differences in chiasma distribution in marsupials

Moore

Evans²

1988

Heredity

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Section: Discussionsupporting

confidence: 74%

Further evidence of novel sex differences in chiasma distribution in marsupials

Moore

Evans²

1988

Heredity

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“…The involvement of the centromere in chromosomal rearrangements giving rise to the karyotypic diversification within Macropodidae is evident when the phylogenetic history of conserved syntenic segments is mapped across this group of mammals (Hayman et al, 1987;O'Neill et al, 2004). KERV was originally identified in the centromeres of M. rufogriseus and has been localized as part of this study to the centromeres of every chromosome in the karyotype of M. eugenii.…”

Section: Discussionmentioning

confidence: 97%

A centromere-specific retroviral element associated with breaks of synteny in macropodine marsupials

Ferreri

Marzelli

Rens

et al. 2004

Cytogenet Genome Res

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Studies of chromosome evolution have focused heavily on the evolution of conserved syntenic, gene-rich domains. It is obvious, however, that the centromere plays an equally important role in chromosome evolution, through its involvement in fissions, centric fusions, translocations, inversions and centric shifts. It is unclear how the centromere, either as a functioning unit of the chromosome or as a DNA sequence motif, has been involved in these processes. Marsupials of the family Macropodidae (kangaroos, wallabies, rat kangaroos and potoroos) offer unique insights into current theories expositing centromere emergence during karyotypic diversification and speciation. Tracing the genomic distribution of centromeric sequences in a model macropodine (subfamily Macropodinae: kangaroos and wallabies) species, Macropus eugenii (tammar wallaby), indicates these sequences have played an important role in chromosome evolution through possible segmental duplications associated with phylogenetically conserved breaks of synteny, pericentromeric and subtelomeric regions. Hybrids between different kangaroo species provide evidence that the centromere is unstable within this group of mammals and is involved in a large number of chromosome aberrations. A better understanding of the genetic and epigenetic factors that define centromeres and how centromeres may mediate changes in chromosome architecture are critical not only to our understanding of basic cellular functioning but also to our understanding of the process of speciation.

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“…Comparative chromosome evolution has been well studied in Australian marsupial species and considerable detail is known about the mitotic complements (Rofe and Hayman, 1985;Hayman et a!., 1987). As an extension of these studies meiosis has been examined in some 33 species.…”

Section: Introductionmentioning

confidence: 99%

An examination of the role of chiasma frequency in the genetic system of marsupials

Sharp

1988

Heredity

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Chiasma frequencies have been collected from males of 33 species of marsupial, varying widely with respect to size, reproduction and development. Correlation analyses show that species with lower levels of recombination are smaller, have larger litters and develop more quickly. Two indices of recombination level were considered: Darlington's Recombination Index, and the Excess Chiasma frequency (chiasmata above one per bivalent). The EC is in general more strongly correlated than RI with aspects of life history. It is suggested that EC levels have evolved due to the effects of EC on recombination, but that chromosome number has evolved independently.

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Chromosome evolution in marsupials

Cited by 12 publications

References 13 publications

Further evidence of novel sex differences in chiasma distribution in marsupials

Further evidence of novel sex differences in chiasma distribution in marsupials

A centromere-specific retroviral element associated with breaks of synteny in macropodine marsupials

An examination of the role of chiasma frequency in the genetic system of marsupials

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