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. 1987 Mar;79(3):1010–1015. doi: 10.1172/JCI112868

Leukocytes from four patients with complete or partial Leu-CAM deficiency contain the common beta-subunit precursor and beta-subunit messenger RNA.

N Dana, L K Clayton, D G Tennen, M W Pierce, P J Lachmann, S A Law, M A Arnaout
PMCID: PMC424264  PMID: 2880869

Abstract

Deficiency of a family of three leukocyte adhesion molecules (Leu-CAM) is associated with recurrent and life-threatening bacterial infections in man. Each of the three antigens, Mo1, LFA-1, and Leu M5 has a distinct alpha subunit noncovalently associated with a common beta subunit that appears to be required for the expression of these antigens on the cell surface. To investigate the molecular basis of Leu-CAM deficiency, we studied leukocytes from four unrelated patients suffering from complete or partial Leu-CAM deficiency using immunoprecipitation of metabolically labeled proteins, RNA extraction, and Northern blot analysis. We found that B cells from all four patients synthesized a normal sized beta subunit precursor that either failed to "mature" or matured only partially to the membrane expressed form. B cells from all four patients also had a single normal sized beta subunit mRNA of approximately 3.4 kb. Leu-CAM deficiency, in these unrelated patients, is not due to the absence of the beta chain gene or to aberrant splicing of its mRNA and are consistent with a defective beta subunit gene resulting in abnormal posttranslational processing of the synthesized molecule.

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