Regional assignment of the human loci for uvomorulin (UVO) and chymotrypsinogen B (CTRB) with the help of two overlapping deletions on the long arm of chromosome 16.

Using cDNA probes for the human uvomorulin (UVO) and rat chymotrypsinogen B (CTRB) genes, we have analyzed two overlapping interstitial deletions on human chromosome 16q by Southern blot analysis. One deletion, with breakpoints at 16q22.1 and 16q22.3, results in loss of the UVO locus. The second deletion, whose breakpoints are at 16q22.1 and 16q23.2, leads to loss of the CTRB locus. Therefore, UVO resides between both proximal deletion breakpoints within band 16q22.1, whereas CTRB is located between both distal breakpoints at 16q22.3 and 16q23.2.