| IDENTIFICATION OF SPECIES OF ORIGIN |
Species of Origin Confirmed by Nucleoside Phosphorylase, Glucose-6-Phosphate Dehydrogenase, and Lactate Dehydrogenase Isoenzyme Electrophoresis and by Chromosome Analysis |
| |
| Gene |
APOE |
| Chromosomal Location |
19q13.2 |
| Allelic Variant 1 |
107741.0015; APOE3 ISOFORM |
| Identified Mutation |
CYS112 AND ARG158; Weisgraber et al. [J. Biol. Chem. 256: 9077-9083 (1981)] and Rall et al. [Proc. Nat. Acad. Sci. 79: 4696-4700 (1982)] identified one of the 3 major apolipoprotein E isoforms, apolipoprotein E3. The variant has Cys112 and Arg158. This is the most common variant, with frequencies of 40% to 90% in various populations. |
| |
| Gene |
APOE |
| Chromosomal Location |
19q13.2 |
| Allelic Variant 2 |
107741.0016; APOE4 ISOFORM |
| Identified Mutation |
CYS112ARG; Weisgraber et al. [J. Biol. Chem. 256: 9077-9083 (1981)], Das et al. [J. Biol. Chem. 260: 6240-6247 (1985)] and Paik et al. [Proc. Nat. Acad. Sci. 82: 3445-3449 (1985)] identified the apolipoprotein E4 isoform in which there is a Cys112-to-Arg substitution. This variant is found in 6% to 37% of individuals from different populations. |