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2 Gene in the Murine T Cell Receptor
Locus Cooperates with the 3' Enhancer to Act as a Locus Control Region
Correspondence to: David H. Raulet, 485 LSA, University of California at Berkeley, Berkeley, CA 94720-3200. Tel:510-642-9521 Fax:510-642-1443 E-mail:raulet{at}uclink4.berkeley.edu.
Transgenic expression constructs were employed to identify a cis-acting transcription element in the T cell receptor (TCR)-
locus, called HsA, between the V
5 and V
2 genes. In constructs lacking the previously defined enhancer (3'EC
1), HsA supports transcription in mature but not immature T cells in a largely position-independent fashion. 3'EC
1, without HsA, supports transcription in immature and mature T cells but is subject to severe position effects. Together, the two elements support expression in immature and mature T cells in a copy numberdependent, position-independent fashion. Furthermore, HsA was necessary for consistent rearrangement of transgenic recombination substrates. These data suggest that HsA provides chromatin-opening activity and, together with 3'EC
1, constitutes a T cellspecific locus control region for the TCR-
locus.
Key Words:
T cell receptor
, locus control region, V(D)J recombination, transcription, enhancer
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