Evolution of Alu repeats surrounding the human ferredoxin gene.

Ferredoxin is an iron-sulfur protein that serves as an electron carrier for the mitochondrial oxidation/reduction system. During the characterization of the human ferredoxin gene, we have identified three Alu sequences surrounding it. When these Alu sequences were compared with others, all three of them are more related to the consensus Alu than the 7SL gene, the progenitor of the Alu family. It suggests that they are members of the modern Alu family. Their sequences differ from the Alu consensus sequence by about 5%, indicating that they were inserted into the chromosome about 35 million years ago.