- Adenosine kinase deficiency is associated with developmental abnormalities and reduced transmethylation. Moffatt, B.A., Stevens, Y.Y., Allen, M.S., Snider, J.D., Pereira, L.A., Todorova, M.I., Summers, P.S., Weretilnyk, E.A., Martin-McCaffrey, L., Wagner, C. Plant Physiol. (2002)