  We consider different supersymmetric mixed boundary conditions for scalar and
fermionic fields in $AdS_2$, searching for the dual description of a family of
interpolating Wilson Loops in ABJM theory. The family, which interpolates
between the bosonic 1/6 BPS loop and the 1/2 BPS loop, can be thought of as an
exact marginal deformation in a defect CFT$_1$. Confronting this property
against holographic correlators and vacuum energy corrections singles out a
particular boundary condition which we propose as dual to the interpolating
family of Wilson loops.
