Three of the following four letter-clusters are alike in a certain way and one is different. Pick the odd one out.

UVZ MNP XYA QRT

UVZ

UVZ ⇒ U →(+1)→ V →(+4) → Z (ODD) XYA ⇒ X →(+1)→ Y→(-2) → A  MNP ⇒ M →(+1)→ N →(+2) → P QRT ⇒ Q →(+1)→ R→(+2) → T