Constant ISSUE_DEPENDED_ON_BY 

pub const ISSUE_DEPENDED_ON_BY: &str = "query($id:ID!,$first:Int!,$after:String){node(id:$id){__typename\n      ... on Issue{\n        blocking(first:$first,after:$after){nodes{...Related}pageInfo{hasNextPage endCursor}}\n      }}} fragment Related on Issue{id title body parent{id} subIssuesSummary{total}}";

What depends on one issue: ISSUE_DEPENDENCIES with its blocking alone. No body: the reverse of a recorded edge is derived from the far end, never written down here.