Coexistence of Two Distinct Copies of Naphthalene Degradation Genes in Pseudomonas Strains Isolated from the Western Mediterranean Region

We analyzed the occurrence of the naphthalene degradation upper-pathway (nah) genes in the western Mediterranean region. The amplification, restriction, and sequence analysis of internal fragments for several nah genes (nahAc, nahB, nahC, and nahE) from naphthalene-degrading strains isolated from this geographical area proved the coexistence of two distinct sets of nah genes.