Human glucocorticoid receptor 1A promoter and splice variants
A new sequence, hGR 1Ap/e, has been isolated from human DNA upstream from the previously known 2.7 kbp human GR promoter region. This new sequence was found to contain a new promoter (the 1A GR promoter) and a new untranslated exon sequence (GR exon 1A) for the human glucocorticoid receptor protein (Hgr). Alternative splicing produces three different hGR 1A-containing transcripts, 1A1, 1A2, and 1A3. Exon 1A3-containing GR transcripts appear to be restricted to blood cell cancers and to the human brain. Glucocorticoid hormone treatment caused an up-regulation of exon 1A3-containing GR transcripts in T-lymphoblast cells, and a down-regulation of exon 1A3-containing transcripts in B-lymphoblast cells. Thus detection of exon 1A3-containing transcripts can be used for the diagnosis of patients with blood cell cancers, including T-cell acute lymphoblastic leukemia (ALL), and to identify patients that would benefit from glucocorticoid hormone treatment.
1. An isolated hGR 1Ap/e polynucleotide fragment of the human glucocorticoid receptor promoter 1A and exon 1A comprising at least 2056 bases of SEQ ID NO: 1.
2. A hGR 1Ap/e polynucleotide fragment as in claim 1 , wherein the receptor promoter 1A comprises the region from 1 to 1075 bases as numbered in SEQ ID NO: 1.
3. A hGR 1Ap/e polynucleotide fragment as in claim 1 , wherein the exon 1A comprises the region from 1076 to 2056 bases as numbered in SEQ ID NO: 1.
4. An isolated human glucocorticoid receptor exon 1A region as in claim 3 , wherein transcription of the exon region results in a mRNA transcript.
5. An isolated mRNA transcript of human glucocorticoid receptor exon 1A region as in claim 4 , wherein the transcript results from transcription of the region from 1076 to 2056 bases as numbered in SEQ ID NO: 1.