Contiguous arrangement of p45 NFE2, HnRNP A1, and HP1 alpha on mouse chromosome 15 and human chromosome 12: evidence for suppression of these genes due to retroviral integration within the Fli-2 locus.
Fli-2 is a common site of proviral integration in multistage erythroleukemia cells induced by Friend murine leukemia virus (F-MuLV) or the polycythemia strain of Friend leukemia virus (FV-P). Previously, we reported that integration of Friend virus into the Fli-2 locus in CB3, an erythroleukemia cell line that harbors a homozygous inactivation of the Fli-2 locus, results in the loss of expression of two genes encoding the 45-kDa subunit of the erythroid-specific nuclear factor p45 NFE2 and the splicing factor HnRNP A1. Here, we report the identification of a third gene, Heterochromatin protein 1 (HP1alpha, also known as CBX5), which is located downstream of HnRNP A1, and p45 NFE2. Northern blot analysis revealed that the expression of HP1alpha, along with p45 NFE2 and HnRNP A1, is either undetectable or substantially reduced in CB3 cells, suggesting that HP1alpha expression is also regulated by proviral insertion within the Fli-2 locus in CB3 cells. Because p45 NFE2 was previously mapped to mouse chromosome 15, our results demonstrate that HP1alpha and HnRNP A1 are also located on mouse chromosome 15 and that the p45 NFE2, HnRNP A1, and HP1alpha genes are arranged contiguously. Contiguous arrangement of these three genes was also detected in man; this consequently localizes HP1alpha to human chromosome band 12q13.
Li
Y J
YJ
Sunnybrook and Women's College Health Sciences Centre, Division of Cancer Biology Research, Toronto, Canada.
Pak
B J
BJ
Higgins
R R
RR
Lu
S J
SJ
Ben-David
Y
Y
D000818:Animals; D000090266:Chromobox Protein Homolog 5; D002868:Chromosomal Proteins, Non-Histone / Q000235:genetics*; D002881:Chromosomes, Human, Pair 12 / Q000235:genetics*; D004268:DNA-Binding Proteins / Q000235:genetics*; D050981:Erythroid-Specific DNA-Binding Factors; D023061:Gene Order / Q000235:genetics; D006570:Heterochromatin / Q000235:genetics*; D000076245:Heterogeneous Nuclear Ribonucleoprotein A1; D034481:Heterogeneous-Nuclear Ribonucleoprotein Group A-B; D034441:Heterogeneous-Nuclear Ribonucleoproteins; D006801:Humans; D008297:Male; D051379:Mice; D008969:Molecular Sequence Data; D050984:NF-E2 Transcription Factor, p45 Subunit; D051789:Proto-Oncogene Protein c-fli-1; D011518:Proto-Oncogene Proteins; D012332:RNA, Heterogeneous Nuclear / Q000235:genetics; D016601:RNA-Binding Proteins / Q000235:genetics; D015183:Restriction Mapping; D012261:Ribonucleoproteins / Q000235:genetics*; D013489:Suppression, Genetic; D015534:Trans-Activators / Q000235:genetics*; D014157:Transcription Factors / Q000235:genetics*
C000715594:CBX5 protein, human; C000715595:CBX5 protein, mouse; D002868:Chromosomal Proteins, Non-Histone; D004268:DNA-Binding Proteins; D050981:Erythroid-Specific DNA-Binding Factors; C497426:Fli1 protein, mouse; D006570:Heterochromatin; D000076245:Heterogeneous Nuclear Ribonucleoprotein A1; D034481:Heterogeneous-Nuclear Ribonucleoprotein Group A-B; D034441:Heterogeneous-Nuclear Ribonucleoproteins; D050984:NF-E2 Transcription Factor, p45 Subunit; C494692:NFE2 protein, human; C494693:Nfe2 protein, mouse; D051789:Proto-Oncogene Protein c-fli-1; D011518:Proto-Oncogene Proteins; D012332:RNA, Heterogeneous Nuclear; D016601:RNA-Binding Proteins; D012261:Ribonucleoproteins; D015534:Trans-Activators; D014157:Transcription Factors; D000090266:Chromobox Protein Homolog 5