Dhaliwal M K, Pathak S, Shirley L R, Flanagan J P
Department of Cell Biology, University of Texas, M. D. Anderson Cancer Center, Houston 77030.
Cytobios. 1988;56(224):29-38.
Silver staining of cells in metaphase and interphase nuclei of both sexes of the Bennett wallaby, Macropus rufogriseus, has shown that (1) the nucleolus organizer region (NOR) is located only on the X chromosome (single Ag-NOR); (2) both X chromosomes in the female cells stain with silver; (3) the amounts of silver staining of metaphase chromosomes and interphase nuclei of both sexes are very similar; (4) the single X chromosome is hyperactive in male cells to equalize the expression of rRNA genes in the female cells with two X chromosomes; and (5) the mechanism of dosage compensation for rRNA genes in this species is similar to that reported for Drosophila salivary gland cells.
对赤褐袋鼠（Macropus rufogriseus）两性中期和间期细胞核中的细胞进行银染显示：（1）核仁组织区（NOR）仅位于X染色体上（单个Ag-NOR）；（2）雌性细胞中的两条X染色体均被银染；（3）两性中期染色体和间期细胞核的银染量非常相似；（4）雄性细胞中的单条X染色体高度活跃，以使具有两条X染色体的雌性细胞中rRNA基因的表达达到平衡；（5）该物种rRNA基因的剂量补偿机制与果蝇唾液腺细胞中报道的机制相似。
