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Targeting the GA binding protein beta1L isoform does not perturb lymphocyte development and function.

Hai-Hui Xue¹, Xuefang Jing, Julie Bollenbacher-Reilley

¹Department of Microbiology, University of Iowa, 51 Newton Road, BSB 3-710, Iowa City, IA 52246, USA. hai-hui-xue@uiowa.edu

Molecular and Cellular Biology

|April 23, 2008

Summary

The longer GABPbeta1L subunit is not essential for T and B cell development. The shorter GABPbeta1S isoform is critical for maintaining GABPalpha/beta complex transcriptional activity.

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Area of Science:

Immunology
Molecular Biology
Genetics

Background:

GA binding protein (GABP) is an Ets transcription factor with alpha and beta subunits.
GABPalpha binds DNA, while GABPbeta activates transcription.
Two GABPbeta splice variants, GABPbeta1L and GABPbeta1S, exist with differing functional properties.

Purpose of the Study:

To investigate the specific roles of GABPbeta1L and GABPbeta1S isoforms in T and B cell development.
To determine the function of GABPbeta1S in GABP complex transcriptional activity.

Main Methods:

Generation and analysis of GABPbeta1L-deficient mice.
Analysis of T and B cell development and function in knockout mice.
Assessment of GABP complex activity.

Main Results:

Mice lacking GABPbeta1L (GABPbeta1L-/-) exhibited normal T and B cell development and function.
Complete deficiency of both GABPbeta1L and GABPbeta1S led to early embryonic lethality.
GABPbeta1S, despite lacking homodimerization, is crucial for GABPalpha/beta complex transcriptional activity.

Conclusions:

GABPbeta1L is dispensable for adaptive immunity.
GABPbeta1S plays a vital role in maintaining the transcriptional function of the GABP complex.
The suspected dominant-negative role of GABPbeta1S is not supported by these findings.