We previously identified 18q21.33-q23 as a candidate region in one BP family and constructed a yeast artificial chromosome (YAC) contig map. Here, we mapped eight known CAG/CTG repeats relative to 18q21.33-q23. We also isolated four CAG/CTG repeats from within the region using CAG/CTG YAC fragmentation, one of which is located in the 5' untranslated region of the CAP2 gene coding for a brain-expressed serine proteinase inhibitor. The triplet repeats located in the 18q21.33-q23 BP candidate region showed no expanded alleles in the linked BP family nor in a BP case-control sample. Moreover, only the CAP2 triplet repeat was polymorphic but no genetic association with BP disorder was observed.
Goossens, Dirk ; Villafuerte, Sandra ; Tissir, Fadel ; Van Gestel, Sofie ; Claes, Stephan ; et. al. No evidence for the involvement of CAG/CTG repeats from within 18q21.33-q23 in bipolar disorder.. In: European Journal of Human Genetics, Vol. 8, no.5, p. 385-8 (2000)