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M9650296.TXT
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1996-03-09
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Document 0296
DOCN M9650296
TI Selenium and cellular immunity. Evidence that selenoproteins may be
encoded in the +1 reading frame overlapping the human CD4, CD8, and
HLA-DR genes.
DT 9605
AU Taylor EW; Computational Center for Molecular Structure and Design,;
University of Georgia, Athens 30602-2352, USA.
SO Biol Trace Elem Res. 1995 Aug-Sep;49(2-3):85-95. Unique Identifier :
AIDSLINE MED/96087332
AB Selenium deficiency can lead to impaired immune function and reduced
T-cell counts, as well as various specific disorders. Significantly, in
ARC and AIDS patients, a progressive decline in plasma Se, paralleling
T-cell loss, has been widely documented. Since evidence now suggests
that there is an extremely high turnover of CD4+ T-cells in AIDS
patients, with billions of new cells lost and replaced daily, any
exceptional requirement for Se in lymphocytes could contribute to this
progressive Se depletion. Thus, it may be significant that, overlapping
the known genes in the +1 reading frame, the mRNAs of several T-cell
associated genes (CD4, CD8, HLA-DR p33) have open reading frames (ORFs)
with as many as 10 in-frame UGA codons (CD4, p33), a clustering that is
highly improbable by chance alone, and reminiscent of selenoprotein P,
the predominant plasma form of Se. The presence of these ORFs, along
with potential stem-loop RNA structures displaying consensus
selenocysteine insertion sequences, AUG(N)mAAA(N)nUGR, suggests that
these mRNAs may encode selenoproteins, in addition to the known T-cell
glycoproteins. If so, the roles of Se in the immune system may be more
diverse than previously suspected.
DE Amino Acid Sequence Antigens, CD4/*GENETICS Antigens, CD8/*GENETICS
Base Sequence Codon/GENETICS Computer Simulation Human
HIV-1/GENETICS HLA-DR Antigens/GENETICS Immunity, Cellular Lymphocyte
Transformation Molecular Sequence Data *Open Reading Frames
Proteins/BIOSYNTHESIS/*GENETICS/PHYSIOLOGY RNA,
Messenger/*GENETICS/METABOLISM Selenium/BLOOD/*DEFICIENCY/IMMUNOLOGY
Support, U.S. Gov't, P.H.S. T-Lymphocytes/CYTOLOGY/METABOLISM JOURNAL
ARTICLE REVIEW REVIEW, TUTORIAL
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).