Dioxygenase that specifically demethylates DNA methylated on the 6th position of adenine (N(6)-methyladenosine) DNA (PubMed:25936838, PubMed:30078725). N(6)-methyladenosine (m6A) DNA is present at a relatively high level at the very earliest embryonic stages but at low levels at the late embryonic stages and may act as a regulator of gene expression (PubMed:25936838). Promotes differentiation of early germ cells in ovary (PubMed:25936838). Contributes to neuronal morphology, development, and function in the brain (PubMed:30078725). By interacting with histone modifier wds, binds to a specific set of genes, modulates intragenic (N(6)-methyladenosine) DNA levels and thereby maintains transcriptional activation (PubMed:30078725). 2-oxoglutarate + an N(6)-methyl-2'-deoxyadenosine in DNA + O2 = a 2'-deoxyadenosine in DNA + CO2 + formaldehyde + succinate Binds 1 Fe(2+) ion per subunit. Binds 3 zinc ions per subunit. The zinc ions have a structural role. Interacts (via C-terminus) with wds (via WD repeats). Expressed in brain (at protein level). Weakly expressed during early embryonic stages but is highly expressed during the later embryonic stages. Lethality at the pupa stage. A small population of mutant animals are however able to pass through the pupa stage but die within 3 days post-eclosion. Strong developmental defects and significantly increases the abundance of N(6)-methyladenosine (m6A) modification in DNA. RNAi-mediated knockdown results in mushroom bodies abnormalities, including beta-lobes which erroneously cross the midline, missing or misdirected alpha- and beta-lobes, as well as truncated or overbranched lobes (PubMed:30078725). RNAi-mediated knockdown in neurons results in mushroom body abnormalities in adult flies (PubMed:30078725). Simultaneous RNAi-mediated knockdown of Tet and wds results in enhanced mushroom body alpha lobe development defects compared to the single Tet knockdown (PubMed:30078725). Belongs to the TET family. Truncated N-terminus. Truncated N-terminus.