A beta zero-thalassemic beta-globin RNA that is labile in bone marrow cells is relatively stable in HeLa cells.
We have shown previously that a beta-globin RNA-deficient beta zero-thalassemia is caused by a single base-pair deletion in codon 44 of the human beta-globin gene1. The lack of beta-globin RNA in erythroid cells of these affected individuals is due to extreme beta-globin RNA instability (t 1/2 = 30 min)2. We have further investigated the mechanism of this extreme lability by transiently expressing the beta zero-thalassemic allele in HeLa cells and assaying the stability of the beta-globin RNA that is produced. Surprisingly, the beta zero-thalassemic RNA is much more stable in HeLa cells than in bone marrow cells. Apparently, developing erythroid cells have a mechanism for turning over this thalassemic RNA while cervical carcinoma cells do not. We also have assayed the stability of RNA derived from in vitro-mutagenized beta-globin genes. In HeLa cells, beta-globin RNAs harboring deletions in and around the translation initiation codon accumulate to steady-state levels that are similar to the level of normal beta-globin RNA.
Maquat
L E
LE
Kinniburgh
A J
AJ
D000483:Alleles; D000818:Animals; D001483:Base Sequence; D001853:Bone Marrow / Q000032:analysis; D005914:Globins / Q000235:genetics*; D006207:Half-Life; D006367:HeLa Cells / Q000032:analysis; D006801:Humans; D051379:Mice; D012313:RNA / Q000032:analysis*; D013789:Thalassemia / Q000235:genetics*
D012313:RNA; D005914:Globins