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Comparative gene assignments of 18 markers, based on analyses of somatic cell hybrids and previous data in the literature, indicated that human (HSA) syntenic groups 3, 12, 14, and 15 are dissociated in the spider monkey species Ateles paniscus chamek (APC). Markers present in HSA 3p were allocated to APC 3 and APC 9. The HSA 12 cluster was split into two syntenic groups, one mainly including HSA 12p markers in APC 16 and the other, including HSA 12q markers, in APC 2p. The HSA 14q cluster split into three syntenic groups, corresponding to APC 2q, APC 6, and APC 12. Finally, the HSA 15 cluster split into two syntenic groups, APC 2q and APC 3. Comparisons with previous gene assignments and human SROs led to the tentative postulation of rearrangements having occurred during the evolutionary divergence of man and A. paniscus chamek. Chromosome painting data in the congeneric species A. geoffroyi, other New World and Old World primates, and several representative non-primate animals were compared in an attempt to delineate the ancestral and derived conditions underlying the evolutionary rearrangement of syntenic groups in mammals., (Copyright 2000 S. Karger AG, Basel)

Comparative mapping of Ateles paniscus chamek and man indicated that four human 3p markers are syntenic in this karyotypically rearranged neotropical primate. The evolutionary conservation of this gene cluster includes three adjacent human shortest regions of overlap (SROs): 3p21.1 (ACY1), 3p21.3-->p21.2 (CACNA1D), and 3p21.3 (ZNF64). A fourth syntenic marker (ATP2B2), at a more distal human SRO (3p26-->p25), indicated that human 3pter-->p14 is evolutionarily conserved in Ateles chromosome 3 (APC 3). Conversely, allocations of two human 3q markers (AGTR1 and IL12A) clearly excluded APC 3. Finally, allocation of the major histocompatibility complex class I genes further confirmed human 6p-6q dissociations in Ateles.