Abstract:
:The terminal deoxynucleotidyl transferase gene (TdT) is expressed in mice only in early B and T lymphoid precursors a few days after birth. Transactivating factors have been shown to contribute to the lymphoid specific expression of TdT, but they do not account entirely for the restriction of its expression to early precursors. Since tissue-specific expression can be modulated by other mechanisms such as DNA methylation and DNA accessibility, we evaluated the methylation pattern of the TdT gene in various expressing and non-expressing tissues and cell lines. Lymphoid and non-lymphoid organs differed significantly in their methylation profiles. In the thymus nearly complete demethylation of a Hha I site in the promoter was associated with high levels of TdT transcription. There was similar, but weaker demethylation of the TdT promoter in bone marrow, possibly due to the presence of a few TdT expressing B cell precursors. The same methylation status was also associated with TdT expression in different B and T cell lines. Kinetic studies of TdT gene demethylation and TdT transcription during thymus development showed that changes in methylation status were also involved in the differential expression of TdT in fetal and adult life. Footprinting experiments revealed the existence of three regions specifically protected by nuclear extracts from TdT -expressing cells. Together, these results suggest that promoter demethylation is involved in the control of TdT expression and implicate new promoter regions in this regulation.
journal_name
J Mol Bioljournal_title
Journal of molecular biologyauthors
Nourrit F,Coquilleau I,D'Andon MF,Rougeon F,Doyen Ndoi
10.1006/jmbi.1999.3079keywords:
subject
Has Abstractpub_date
1999-09-17 00:00:00pages
217-27issue
2eissn
0022-2836issn
1089-8638pii
S0022-2836(99)93079-6journal_volume
292pub_type
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