Abstract：
:Members of cutaneous melanoma (CM) families with dysplastic nevi (DN) are at high risk of developing CM. Using a shuttle vector plasmid, pSP189, cell lines from three patients with CM plus DN were previously found to have elevated post-UV plasmid mutability. To investigate familial occurrence of this cellular phenotype, we examined post-UV plasmid mutability in 31 lymphoblastoid cell lines from 6 familial CM kindreds. In comparison to 16 normal control lines, we found an abnormally elevated post-UV plasmid mutability in cell lines from 13 of 13 patients with CM plus DN (P = 1.5 x 10(-8)) and from 5 of 8 patients with DN only (P = 0.001). Elevated spontaneous plasmid mutation frequency (MF) was also present in cell lines from six of the CM plus DN patients (P = 0.002) and three of the DN-only patients (P = 0.028). However, cell lines from two patients with CM without DN had normal post-UV plasmid MF. Although not specific for CM patients, of 27 cell lines with elevated post-UV plasmid MF, only 8 were from donors who did not have CM + DN or DN (19 of 24 versus 8 of 28; P = 0.0003). This study indicates that post-UV plasmid hypermutability is a laboratory marker for members of melanoma-prone families and suggests that patients with familial CM have a defective mechanism for handling UV-induced DNA damage.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Moriwaki SI,Tarone RE,Tucker MA,Goldstein AM,Kraemer KHsubject
Has Abstractpub_date
1997-10-15 00:00:00pages
4637-41issue
20eissn
0008-5472issn
1538-7445journal_volume
57pub_type
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