Gene map of the new world Bolivian owl monkey, Aotus.

Somatic cell hybrids between rodent cells and owl monkey cells preferentially segregating primate chromosomes were selected for mapping owl monkey genes. Concordant segregation of phenotype and chromosome in 35 independent hybrid clones and 105 subclones with different reduced owl monkey complements provided evidence for the assignment of 17 gene loci to 9 chromosomes of the Bolivian owl monkey with a karyotype VI (2n = 49 male, 50 female). The assignments include: MDH1 to chromosome 2, MDH2 to chromosome 4, FH to chromosome 6, LDHB to chromosome 10, NP-MPI-PKM2-SORD to chromosome 11, PGM1-PGD-AK2-ENO1 to chromosome 12, LDHA to chromosome 19, GPI to chromosome 25 and PGK-G6PD-GLA to the X chromosome.

Banding patterns of the chromosomes of two new karyotypes of the owl monkey, Aotus, captured in Panama.

Two new chromosome complements of Aotus trivirgatus griseimembra are described making a total of five different karyotypes observed in this subspecies inhabiting Panama and the northwestern part of Colombia, South America. Detailed comparisons of the G-banded chromosomes of these five karyotypes suggest that the polymorphism of chromosome numbers 56 and 55 in Panamanian Aotus and 54, 53, and 52 in Colombian Aotus stems primarily from a Robertsonian translocation mechanism involving pairs B13 and B14 (or A1). A second Robertsonian translocation mechanism involving pairs B28 and B29 (or A2) constitutes the karyotypic differences between the two chromosomal races.

Translocation of Y chromosome to an autosome in the Bolivian owl monkey, Aotus.

Karyotypic study of a population sample of twenty-one owl monkeys, Aotus, originating from Bolivia, revealed two sex-specific somatic diploid chromosome numbers: 49 for males and 50 for females. The presence of a trivalent in male meiotic figures and the identification of chromosomes by band pattern analysis confirmed the interpretation of a Y-autosome translocation in the males.