Abstract: Objective To screen and analyze genes differentially expressed within dermal papillae cells(DPC)with aggregative behavior.Methods Total RNA was extracted from DPC with and without aggregative behavior,and double-stranded cDNA were synthesized by using SMART cDNA synthesis.The cD-NA fragments of differentially expressed genes in dermal papillae cells with aggregative behavior were isolated by suppression subtractive hybridization,sequencing,and then subtracted library was set up.Positive clones were screened by PCR method and verified by cDNA dot blot and then analyzed through homologous retrieving.Results A subtractive cDNA library of DPC with aggregative behavior was successfully constructed.The results of screening and cloning of the library showed that DPC with aggregative behavior could express genes related to homologous aggregation,regnlation of growth,differentiation and development,and signal transduction proliferation and cycle control,which included known genes(capping protein,paladin,vas-cular endothelial growth factor),hematopoietic stem/progenitor cells(HSPC)related genes(HSPC011and HSPC016)and a new gene.Conclusions The construction of subtractive library of DPC lays solid founda-tion for screening and cloning new and specific genes related to aggregative behavior of DPC.Several genes may cooperatively involve in homologous aggregation,and regnlation of growth of DPC.Among these genes,capping protein and palladin may be closely related to aggregative behavior of DPC,and VEGF and HSPC related clones may be responsible for the status of higher proliferation of DPC.

Key words: Hair follicle, Gene library, Suppression subtractive hybridization