The human genes for GM-CSF and IL 3 are closely linked in tandem on
chromosome 5
YC Yang, S Kovacic, R Kriz, S Wolf, SC Clark, TE Wellems, A Nienhuis and N Epstein
Genetics Institute, Cambridge, MA 02140.
As demonstrated by long-range mapping of restriction endonuclease
recognition sequences and genomic cloning, we found that the human genes
encoding interleukin 3 (IL 3) and granulocyte/macrophage colony-
stimulating factor (GM-CSF) are tandemly arrayed on the long arm of
chromosome 5, separated by 9 kilobases (kb) of DNA. This close physical
linkage of genes with similar structure and biologic function suggests that
these cytokines may have evolved from a common ancestral gene. This linkage
in evolution of two relatively divergent genes further implies that some of
the other lymphokine and cytokine genes that appear to share as much or
more sequence similarity than do IL 3 and GM- CSF may be distantly related
members of a cytokine gene family.
Volume 71,
Issue 4,
pp. 958-961,
04/01/1988
Copyright © 1988 by The American Society of Hematology