Chromogranin A, chromogranin B, and secretogranin II, members of the chromogranin/secretogranin secretory protein family, are overexpressed in some human hereditary maladies and may have arisen, in part, from common ancestor genes. To understand better the mammalian chromosomal dispersion of this gene family and to facilitate studies of these genes in human illnesses and their animal models, we positioned the locus of each member in the rat, mouse, and human genomes. Our results indicate that each locus lies in a region of locally syntenic chromosomal homology across the three species.
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