Functional studies of BCL11A: characterization of the conserved BCL11A-XL splice variant and its interaction with BCL6 in nuclear paraspeckles of germinal center B cells.

Abstract:

BACKGROUND:Chromosomal aberrations of BCL11A at 2p16.1 have been reported in a variety of B-cell malignancies and its deficiency in mice leads to a profound block in B-cell development. RESULTS:Alternative pre-mRNA splicing of BCL11A produces multiple isoforms sharing a common N-terminus. The most abundant isoform we have identified in human lymphoid samples is BCL11A-XL, the longest transcript produced at this locus, and here we report the conservation of this major isoform and its functional characterization. We show that BCL11A-XL is a DNA-sequence-specific transcriptional repressor that associates with itself and with other BCL11A isoforms, as well as with the BCL6 proto-oncogene. Western blot data for BCL11A-XL expression coupled with data previously published for BCL6 indicates that these genes are expressed abundantly in germinal-center-derived B cells but that expression is extinguished upon terminal differentiation to the plasma cell stage. Although BCL11A-XL/BCL6 interaction can modulate BCL6 DNA binding in vitro, their heteromeric association does not alter the homomeric transcriptional properties of either on model reporter activity. BCL11A-XL partitions into the nuclear matrix and colocalizes with BCL6 in nuclear paraspeckles. CONCLUSION:We propose that the conserved N-terminus of BCL11A defines a superfamily of C2HC zinc-finger transcription factors involved in hematopoietic malignancies.

journal_name

Mol Cancer

journal_title

Molecular cancer

authors

Liu H,Ippolito GC,Wall JK,Niu T,Probst L,Lee BS,Pulford K,Banham AH,Stockwin L,Shaffer AL,Staudt LM,Das C,Dyer MJ,Tucker PW

doi

10.1186/1476-4598-5-18

subject

Has Abstract

pub_date

2006-05-16 00:00:00

pages

18

issn

1476-4598

pii

1476-4598-5-18

journal_volume

5

pub_type

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