Exploring evolution in Ceboidea (Platyrrhini, primates) by Williams-Beuren probe (HSA 7q11.23) chromosome mapping.
The ancestral platyrrhine karyotype was characterised by a syntenic association of human 5 and a small segment of human 7 orthologues. This large syntenic association has undergone numerous rearrangements in various phylogenetic lines. We used a locus-specific molecular cytogenetic approach to study the chromosomal evolution of the human 7q11.23 orthologous sequences (William-Beuren syndrome, WS) in various Ceboidea (Platyrrhini) species. The fluorescent in situ hybridisation of the WS probe revealed a two-way pattern of chromosomal organisation that suggests various evolutionary scenarios. The first pattern (seen in Callimico and Saimiri) includes a fairly simple disruption of the 7/5 syntenic association by a chromosome fission. The second pattern (seen in Atelinae, Alouattinae and in Callicebus) is characterised by an increasing complexity in the 7/5 association as a consequence of a series of inversions and translocations resulting in different syntenic associations. These data support recent proposals for phylogenomic groupings of New World monkeys. The study also illustrates how single-locus probe hybridisations can reveal intrachromosomal rearrangements.
Picone
Barbara
B
Dipartimento di Biologia animale G Reverberi, Università degli Studi di Palermo, Palermo, Italia.
Dumas
Francesca
F
Stanyon
Roscoe
R
Lannino
Antonella
A
Bigoni
Francesca
F
Privitera
Orsola
O
Sineo
Luca
L
D000818:Animals; D005075:Biological Evolution; D002427:Cebidae / Q000145:classification / Q000235:genetics*; D002874:Chromosome Mapping