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Updated: Aug 19, 2026

Combined DNA-RNA Fluorescent In situ Hybridization (FISH) to Study X Chromosome Inactivation in Differentiated Female Mouse Embryonic Stem Cells
Published on: June 14, 2014
Rps4 maps near the inactivation center on the mouse X chromosome
1Department of Biochemistry and Molecular Genetics, St. Mary's Hospital Medical School, London, United Kingdom.
Abstract:
RPS4Y, a Y-linked gene in humans, appears to encode an isoform of ribosomal protein S4. A homologous locus on the human X chromosome, RPS4X, lies close to the X-inactivation center but fails to undergo X-inactivation. We have isolated a genomic clone from the mouse Rps4 locus, the homolog of human RPS4X. We derived an intron probe that hybridizes to the functional Rps4 locus but does not cross-hybridize to related sequences elsewhere in the mouse genome. Genetic mapping utilizing interspecific mouse backcrosses and the intron-specific probe demonstrates that Rps4 maps close to the Phka locus on the mouse X chromosome and in the vicinity of the X-inactivation center. The gene order Ccg-1-Rps4/Phka-Xist-Pgk-1 is conserved between mouse and human.
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