- A G-->A substitution in an HNF I binding site in the human alpha-fetoprotein gene is associated with hereditary persistence of alpha-fetoprotein (HPAFP). McVey, J.H., Michaelides, K., Hansen, L.P., Ferguson-Smith, M., Tilghman, S., Krumlauf, R., Tuddenham, E.G. Hum. Mol. Genet. (1993)