SNX2 and cancer: PIGU was reported to be mostly related to diseases and cancers and also affects metabolism and endocrine of body [47, 48], which may be the reason of Shaziling pigs’ better disease resistance; MAP1LC3A may be related to the size and reproductive capacity of pigs [49], while it was reported that SNX24 and SNX2 may be associated with the content of trace elements in muscle [50].