Role for rearranged variable gene segments in directing secondary T cell receptor alpha recombination.

Journal Article (Journal Article)

During the recombination of variable (V) and joining (J) gene segments at the T cell receptor alpha locus, a ValphaJalpha joint resulting from primary rearrangement can be replaced by subsequent rounds of secondary rearrangement that use progressively more 5' Valpha segments and progressively more 3' Jalpha segments. To understand the mechanisms that target secondary T cell receptor alpha recombination, we studied the behavior of a T cell receptor alpha allele (HYalpha) engineered to mimic a natural primary rearrangement of TRAV17 to Jalpha57. The introduced ValphaJalpha segment was shown to provide chromatin accessibility to Jalpha segments situated within several kilobases downstream and to suppress germ-line Jalpha promoter activity and accessibility at greater distances. As a consequence, the ValphaJalpha segment directed secondary recombination events to a subset of Jalpha segments immediately downstream from the primary rearrangement. The data provide the mechanistic basis for a model of primary and secondary T cell receptor alpha recombination in which recombination events progress in multiple small steps down the Jalpha array.

Full Text

Duke Authors

Cited Authors

  • Hawwari, A; Krangel, MS

Published Date

  • January 16, 2007

Published In

Volume / Issue

  • 104 / 3

Start / End Page

  • 903 - 907

PubMed ID

  • 17210914

Pubmed Central ID

  • PMC1783412

International Standard Serial Number (ISSN)

  • 0027-8424

Digital Object Identifier (DOI)

  • 10.1073/pnas.0608248104


  • eng

Conference Location

  • United States