Nucleic Acids Research, 1988, Vol. 16, No. 22 10635-10642
© 1988
MOLECULAR BIOLOGY |
Distal CCAAT box deletion in the A
globin gene of two black adolescents with elevated fetal A
globin
Department of Cell and Molecular Biology, Medical College of Georgia Augusta, GA 30912-2100 1Department of Pediatrics, Geisinger Medical Center Danville, PA 17822, USA
*To whom correspondence should be addressed
Received July 25, 1988. Revised October 18, 1988. Accepted October 18, 1988.
Point mutations in G
and A
globin gene promoters areassociated with increased production of G
and A
globin, respectively. To determine whether an upstream promoter mutation could account for elevated A
in a Black adolescent with A
-ß+-HPFH and sickle cell trait, we cloned the 13 kb Bglll fragment containing both
genes into phage lambda vector EMBL3. For one clone, the A
upstream promoter showed no hybridization to a 19 bp oligonucleotide whose sequence centered at 117. AY promoter sequence data for this mutant clone revealed a 13 bp deletion which eliminated the AY distal CCAAT box. Amplified AY genomic DNA of this and a similar case showed hybridization to both deletion-mutant and normal oligonucleotide probes. We propose that this 13 bp deletion removes part of the binding site for a repressor protein which is abundant in adult erythroid cells.
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