[en] Full text: The structure of the ΔI = 1 doublet bands in doubly odd nuclei from the A ∼ 130 mass region is investigated within the orthosymplectic extension [1] of the Interacting Vector Boson Model (IVBM). A new, purely collective interpretation of these bands is given on the basis of the obtained boson-fermion dynamical symmetry of the model. The model calculations are performed for three odd-odd nuclei, namely "1"2"6Pr, "1"3"4Pr and "1"3"2La [2]. The theoretical predictions for the energy levels of the doublet bands as well as the E2 and M1 transition probabilities between the states of the yrast and yrare bands are compared with experiment and the results of other theoretical approaches. The obtained results reveal the applicability of the used orthosymplectic dynamical symmetry of IVBM. References: [1] H. G. Ganev, J. Phys. G: Nucl. Part. Phys. 35, 125101 (2008). [2] H. G. Ganev, A. I. Georgieva, S. Brant, and A. Ventura, Phys. Rev. C 79, 044322 (2009). Rila. (author)