  In this paper we follow the lines of recent works to investigate systems of
two coupled real scalar fields defined by potentials that describe periodic
interactions between the scalar fields. We work with polymeric chains
containing periodic interactions between the coupled fields, and we investigate
the topological sectors to obtain explicit soliton solutions and their
corresponding energy. In particular, we offer an example that considers
deoxyribonucleic acid (DNA) as a system of coupled fields, and we present the
main steps to describe DNA as a polymeric chain belonging to the class of
systems of two coupled real scalar fields.
