Nagamachi C Y, Pieczarka J C, Barros R M
Departamento de Genética, Universidade Federal do Pará, Brasil.
Genetica. 1992;85(3):249-57. doi: 10.1007/BF00132277.
The karyotype of Cebuella pygmaea (2n = 44) obtained by G-, C-banding, and NOR-staining is described. This species presents a heteromorphic C band in the intersticial region of the short arm of chromosome 2. The data obtained were compared with those previously described for the karyotypes of Callithrix jacchus and Callithrix emiliae. The three species differ in the amount and distribution of non-centromeric constitutive heterochromatin. The importance of the variation in constitutive heterochromatin for the phylogeny of the group is discussed. Comparison of the karyotypes in terms of G-banding patterns showed that C. pygmaea and C. emiliae differ from C. jacchus by a Robertsonian translocation and a paracentric inversion, whereas C. pygmaea and C. emiliae differ from each other by a reciprocal translocation between an acrocentric autosome and the short arm of the submetacentric chromosomes that distinguishes their karyotypes from that of C. jacchus. The possible evolutionary paths followed by the karyotypes of the three species are discussed.
描述了通过G带、C带和核仁组织区（NOR）染色获得的侏狨（2n = 44）的核型。该物种在2号染色体短臂的间质区域呈现出异形C带。将获得的数据与先前描述的狨猴和艾氏狨的核型数据进行了比较。这三个物种在非着丝粒组成型异染色质的数量和分布上存在差异。讨论了组成型异染色质变异对该类群系统发育的重要性。根据G带模式对核型进行比较表明，侏狨和艾氏狨与狨猴的区别在于罗伯逊易位和臂内倒位，而侏狨和艾氏狨彼此的区别在于一个近端着丝粒常染色体与亚中着丝粒染色体短臂之间的相互易位，这使得它们的核型与狨猴的核型不同。讨论了这三个物种核型可能遵循的进化路径。
