M. Bahuau et al., EXCLUSION OF ALLELISM OF NOONAN-SYNDROME AND NEUROFIBROMATOSIS-TYPE-1IN A LARGE FAMILY WITH NOONAN-SYNDROME NEUROFIBROMATOSIS ASSOCIATION, American journal of medical genetics, 66(3), 1996, pp. 347-355
A large four-generation family with Noonan syndrome (NS) and neurofibr
omatosis-type 1 (NF1) was studied for clinical association between the
two diseases and for linkage analysis with polymorphic DNA markers of
the NF1 region in 17q11.2. Nonrandom segregation between NS and NF1 p
henotypes was observed. Neurofibromatosis was tightly linked to NF1 ma
rkers, whereas Noonan syndrome was found not be allelic to NF1. These
results suggest that two mutations at two independent but closely link
ed loci are the cause of neurofibromatosis-Noonan syndrome (NF-NS) ass
ociation in this family. (C) 1996 Wiley-Liss, Inc.