Haemoglobin F Jamaica (Alpha-2 gamma-2 61 Lys --> Glu; 136 Ala)

ABSTRACT

Two siblings of mixed Negro, East Indian and Causacian parentage showed an abnormal haemoglobin component in infancy which had electrophoretic characteristics similar to Hb F Roma (Silvestroni & Bianco, 1963). The amino-acid substitution responsible for the peculiar electrophoretic mobility was found to be in the gamma polypeptide chain (gamma-61(E5)Lys-->Glu). The finding of an alanyl residue at position of 136 of the gamma-chain of the abnormal component in the first born of these infants was repeated in the abnormal gamma-chain of the second infant. No functional abnormalities were found to be associated with this abnormal haemoglobin, which is designated Hb F Jamaica (Summary)