Cloning and Expression
Hariharan and Adams (1987) isolated cDNA clones that spanned the entire BCR coding region. The deduced 1,271-residue protein has a molecular mass of about 160 kD. The BCR gene is expressed as mRNAs of 4.5- and 6.7-kb, which apparently encode the same protein.
Stam et al. (1987) showed that the normal gene on chromosome 22 involved at the breakpoint cluster region in the translocation between chromosomes 9 and 22 encodes a 160,000-Da phosphoprotein with serine or threonine kinase activity.
Chissoe et al. (1995) sequenced the complete BCR gene and greater than 80% of the human ABL gene, which are both involved in the t(9;22) translocation (Philadelphia chromosome) associated with more than 90% of CML, 25 to 30% of adult and 2 to 10% of childhood acute lymphoblastic leukemia, and rare cases of acute myelogenous leukemia.