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Lineage-specific compaction of Tcrb requires a chromatin barrier to protect the function of a long-range tethering element.

Publication ,  Journal Article
Majumder, K; Koues, OI; Chan, EAW; Kyle, KE; Horowitz, JE; Yang-Iott, K; Bassing, CH; Taniuchi, I; Krangel, MS; Oltz, EM
Published in: J Exp Med
January 12, 2015

Gene regulation relies on dynamic changes in three-dimensional chromatin conformation, which are shaped by composite regulatory and architectural elements. However, mechanisms that govern such conformational switches within chromosomal domains remain unknown. We identify a novel mechanism by which cis-elements promote long-range interactions, inducing conformational changes critical for diversification of the TCRβ antigen receptor locus (Tcrb). Association between distal Vβ gene segments and the highly expressed DβJβ clusters, termed the recombination center (RC), is independent of enhancer function and recruitment of V(D)J recombinase. Instead, we find that tissue-specific folding of Tcrb relies on two distinct architectural elements located upstream of the RC. The first, a CTCF-containing element, directly tethers distal portions of the Vβ array to the RC. The second element is a chromatin barrier that protects the tether from hyperactive RC chromatin. When the second element is removed, active RC chromatin spreads upstream, forcing the tether to serve as a new barrier. Acquisition of barrier function by the CTCF element disrupts contacts between distal Vβ gene segments and significantly alters Tcrb repertoires. Our findings reveal a separation of function for RC-flanking regions, in which anchors for long-range recombination must be cordoned off from hyperactive RC landscapes by chromatin barriers.

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Published In

J Exp Med

DOI

EISSN

1540-9538

Publication Date

January 12, 2015

Volume

212

Issue

1

Start / End Page

107 / 120

Location

United States

Related Subject Headings

  • VDJ Recombinases
  • V(D)J Recombination
  • Thymocytes
  • Reverse Transcriptase Polymerase Chain Reaction
  • Repressor Proteins
  • Receptors, Antigen, T-Cell, alpha-beta
  • Protein Binding
  • Promoter Regions, Genetic
  • Precursor Cells, B-Lymphoid
  • Mice, Knockout
 

Citation

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MLA
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Majumder, K., Koues, O. I., Chan, E. A. W., Kyle, K. E., Horowitz, J. E., Yang-Iott, K., … Oltz, E. M. (2015). Lineage-specific compaction of Tcrb requires a chromatin barrier to protect the function of a long-range tethering element. J Exp Med, 212(1), 107–120. https://doi.org/10.1084/jem.20141479
Majumder, Kinjal, Olivia I. Koues, Elizabeth A. W. Chan, Katherine E. Kyle, Julie E. Horowitz, Katherine Yang-Iott, Craig H. Bassing, Ichiro Taniuchi, Michael S. Krangel, and Eugene M. Oltz. “Lineage-specific compaction of Tcrb requires a chromatin barrier to protect the function of a long-range tethering element.J Exp Med 212, no. 1 (January 12, 2015): 107–20. https://doi.org/10.1084/jem.20141479.
Majumder K, Koues OI, Chan EAW, Kyle KE, Horowitz JE, Yang-Iott K, et al. Lineage-specific compaction of Tcrb requires a chromatin barrier to protect the function of a long-range tethering element. J Exp Med. 2015 Jan 12;212(1):107–20.
Majumder, Kinjal, et al. “Lineage-specific compaction of Tcrb requires a chromatin barrier to protect the function of a long-range tethering element.J Exp Med, vol. 212, no. 1, Jan. 2015, pp. 107–20. Pubmed, doi:10.1084/jem.20141479.
Majumder K, Koues OI, Chan EAW, Kyle KE, Horowitz JE, Yang-Iott K, Bassing CH, Taniuchi I, Krangel MS, Oltz EM. Lineage-specific compaction of Tcrb requires a chromatin barrier to protect the function of a long-range tethering element. J Exp Med. 2015 Jan 12;212(1):107–120.

Published In

J Exp Med

DOI

EISSN

1540-9538

Publication Date

January 12, 2015

Volume

212

Issue

1

Start / End Page

107 / 120

Location

United States

Related Subject Headings

  • VDJ Recombinases
  • V(D)J Recombination
  • Thymocytes
  • Reverse Transcriptase Polymerase Chain Reaction
  • Repressor Proteins
  • Receptors, Antigen, T-Cell, alpha-beta
  • Protein Binding
  • Promoter Regions, Genetic
  • Precursor Cells, B-Lymphoid
  • Mice, Knockout