Abstract
Gelsolin is a plasma and cytoskeletal protein that severs actin filaments and is regulated by both Ca+2 and polyphosphoinositides. The two forms of gelsolin are encoded by a single gene and derived through alternative message splicing. By Southern blot analysis of somatic cell hybrids and in situ chromosomal localization, we demonstrate that the gelsolin gene is present on human chromosome 9 in bands q32-q34. In situ hybridization of gelsolin to cells containing a Philadelphia chromosome [(9;22)(q34;q11)], as well as Southern blot analysis of K562 cell DNA, indicates that gelsolin is centromeric to the ABL locus in 9q34. Southern blot analysis of NotI-digested, pulsed-field gel electrophoresis-separated DNA indicates the gelsolin gene is greater than or equal to 40 kb centromeric to ABL. These studies and standard Southern blot analysis of digested DNA also indicate that the NotI restriction site contained in the gelsolin gene is uncleavable in DNA from white blood cells and hematopoietic cell lines.
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