  We present a correspondence between two-dimensional $\mathcal{N} = (2,2)$
supersymmetric gauge theories and rational integrable $\mathfrak{gl}(m|n)$ spin
chains with spin variables taking values in Verma modules. To explain this
correspondence, we realize the gauge theories as configurations of branes in
string theory and map them by dualities to brane configurations that realize
line defects in four-dimensional Chern-Simons theory with gauge group
$\mathrm{GL}(m|n)$. The latter configurations embed the superspin chains into
superstring theory. We also provide a string theory derivation of a similar
correspondence, proposed by Nekrasov, for rational $\mathfrak{gl}(m|n)$ spin
chains with spins valued in finite-dimensional representations.
