M.S. Grewal

Quinacrine fluorescent karyotypes of human diploid and heteroploid cell lines

Quinacrine-fluorescence karyotypes were prepared on a series of human cell lines. WI-38 karyotypes were indistinguishable from those obtained from cultured XX blood leukocytes. WI-L2 lymphoblastoid ce

The quinacrine fluorescence karyotype of Mus musculus and demonstration of strain differences in secondary constrictions

In the mouse, virtually every autosome pair, and the X and Y, was identified by its distinctive fluorescent banding pattern after staining with quinacrine mustard. The karyotype was characterized further by measurement of orcein-stained chromosomes and autoradiographic analysis of terminal DNA replication. The autoradiographic identification of the X and Y chromosomes was confirmed by this technique. Fluorescent karyotype analysis of inbred strains and a series of Fx hybrids involving C57BL/6J revealed a polymorphism, the presence or absence of a prominent secondary constriction on any of four different chromosomes, which was probably inherited in a simple Mendelian fashion.

Assignment of linkage groups VIII and X to chromosomes in Mus musculus and identification of the centromeric end of linkage group I

The mitotic chromosomes in primary embryonic cultured cells of eight translocation stocks of Mus musculus were identified by their distinctive fluorescent banding patterns after staining with quinacrine mustard. By correlation of cytologic and genetic information, linkage group (LG) X was assigned to chromosome 7 and LG VIII to chromosome 5. Several earlier assignments were confirmed: LG I to chromosome 8, LG V to chromosome 2, LG XII to chromosome 19, LG XIII to chromosome 1, and LG XVIII to chromosome 9. In addition, chromosomes 4, 17, and 18 were identified in translocations, but the available genetic data did not permit linkage-group assignments. The centromere of chromosome 8 was located at the nv (Nijmegen waltzer) end of LG I by the two-breakpoint method. The position of the centromere of chromosome 1 at the fz (fuzzy) end of LG XIII and that of chromosome 9 at the nr (nervous) end of LG XVIII were confirmed by the same method.