title: Defects in DNA and globin messenger RNA in homozygotes for hemoglobin Lepore.
abstract: Globin messenger RNA (mRNA) isolated from three patients homozygous for hemoglobin Lepore is shown to have a marked reduction of the amount of beta-like globin mRNA (Lepore-globin mRNA sequences) compared with alpha-globin mRNA by molecular hybridization. The relative amounts of alpha- and Lepore mRNA are similar to the amounts of alpha- and Lepore globin synthesized in intact cells and by isolated mRNA in a cell-free system. It is also demonstrated that Lepore-globin mRNA can completely hybridize to full-length or nearly full-length beta-globin specific complementary DNA and protect it from nuclease digestion, indicating close homology between the delta-mRNA sequences present in Lepore mRNA and the beta-complementary-DNA probe. We have also quantitated the numbers of beta-like globin gene sequences in genomic Lepore DNA by molecular hybridization and demonstrated a reduction in their number consistent with the Lepore gene being a delta beta-gene fusion product.
mesh_terms: D000293:Adolescent; D002675:Child, Preschool; D004247:DNA / Q000378:metabolism; D005914:Globins / Q000096:biosynthesis*; D006455:Hemoglobins, Abnormal / Q000235:genetics*; D006720:Homozygote; D006801:Humans; D008297:Male; D009691:Nucleic Acid Denaturation; D009693:Nucleic Acid Hybridization; D014176:Protein Biosynthesis; D012333:RNA, Messenger / Q000378:metabolism; D014158:Transcription, Genetic
chemical_list: D006455:Hemoglobins, Abnormal; D012333:RNA, Messenger; D005914:Globins; D004247:DNA