Involved in autophagy. May play a role in a late step of autophagy, such as clearance of autophagosomal cargo. Plays a key role in innate and adaptive immune response triggered by unmethylated cytidine-phosphate-guanosine (CpG) dinucleotides from pathogens, and mediated by the nucleotide-sensing receptor TLR9. It is necessary for the translocation of CpG dinucleotides from early endosomes to late endosomes and lysosomes, where TLR9 is located (PubMed:29130391). Interacts with RAN. The disease is caused by variants affecting the gene represented in this entry. Affected individuals show homozygosity or compound heterozygosity for truncating mutations, aberrant splicing and/or missense mutations. Parental studies suggest recessive inheritance with no carrier manifestation (PubMed:23222957). Belongs to the EPG5 family. Extended N-terminus. Truncated C-terminus.