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It is stressed that within large N_c-expansion {\bf analytical calculations}of the $(\alpha_s/\pi)^2$ QCD contributions to the valence part of theGottfried sum rule for F_2 structure function of charged leptons-nucleondeep-inelastic scattering reveals the existence of the $O(1/N_c^2)$ {\bfnon-planar} corrections only and the disappearance of the {\bf planar} O(N_c^0)perturbative terms. The relation between Gottfried and Adler sum rule forneutino-nucleon DIS is established and the proposal that the differebce betweencorresponding QCD corrections to higher non-singlet moments in charged-leptonand neutrino DIS are {\bf suppressed by 1/N_c^2} is made. The possibleconsequence of the cancellation of {\bf perturbative planar} graphs in theconsidered perturbative series, namely the existence of light-quark flavourasymmetry $\bar{u}(x)<\bar{d}(x)$, is mentioned. The effect of the similarorigin, i.e. the relation of {\bf ``light-by-light-type''-type structure} inDIS characteristics at the $\alpha_s^3$-level to the generation of lightquark-antiquark asymmetry, is also commented.

Non-planar structure of analytical QCD predictions for the Gottfried sum rule