A search for linkage in families with fragile sites.

Linkage relationships to unassigned and provisionally assigned genetic markers were examined from 53 families segregating for various fragile sites. Fragile sites were at Xq27, 2q13, 6p23, 9p21, 9p32, 10q23, 10q25, 11q13, 11q23, 12q13 and 16p12. No new assignments were made but extensive exclusion data are presented for the markers F13A, F13B, CHE2, K, TF, GPT, C3 and Lu arising from linkage comparisons with fragile sites and other genetic markers. Exclusions of at least 10 cM involving fragile site markers were made for F13A (6p23, 9q32, 10q25), F13B (10q23, 10q25, 16p12), CHE2 (16p12), K (10q23), TF (10q23, 10q25, 11q13), GPT (10q23, 10q25, 11q13), C3 (10q23, 10q25) and Lu (10q25, 11q13).