Isolation of novel human fetal brain cDNAs mapped to human chromosome bands, 1q25 and 8q24.1

We isolated chromosome band-specific human fetal brain cDNAs by the microdissection mediated cDNA capture method, and localized these cDNA using in situ hybridization histochemistry with developing rat brain sections, Uni-Amp cDNAs were prepared fi om an 18-week old human fetal bl ain, and hybridized to human metaphase chromosomes, Eight Uni-Amp cDNAs, hybridized to chromosome band 1q25 or 8q24.1, were recovered by microdissection and PCR amplification with Uni-Amp primers, Among these cDNAs, two novel genes (FB113 of 8q24.1 and FB134 of 1q25) showed a temporospatially interesting expression pattern in the developing rat brains, The expression of FB113 was under dynamic regulation in the developing granule cells of cerebellum and dentate gyrus, FB134 showed a nervous tissue specific expression pattern and an exclusively prominent expression in the developing presubiculum and parasubiculum, By the fluorescence in situ hybridization using human genomic DNAs, FB113 and FB134 were mapped back to the human chromosome bands 8q24.1 and 1q25, respectively. These results indicate that combined application of the microdissection mediated cDNA capture method and irt situ hybridization histochemistry can be used for the isolation of chromosomal band-specific genes related to brain development or human genetic diseases.s