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The human prohibitin (PHB) gene family and its somatic mutations in human tumors.

Five cosmid clones, isolated by procedures to screen genomic libraries for homologous variants of the human prohibitin gene (PHB), were analyzed to determine their genomic structures. Four of these (PHBP1-4) were found to be processed pseudogenes, each located on a different chromosome from their counterparts on chromosome 17q21. The DNA sequence of one clone (PHBP1, on chromosome 6q25) shared a 91.3% identity at the nucleotide level with the cDNA of functional prohibitin. A large number of human tumors of the breast, ovary, liver, and lung were examined for somatic mutations in the PHB gene. Although mutations were observed in a few sporadic breast cancers, none were identified in any of the other cancers.