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Diversity of functional T-cell receptor delta-chain transcripts from bone marrow cells of athymic nude mice


Diversity of functional T-cell receptor delta-chain transcripts from bone marrow cells of athymic nude mice



Immunology 78(2): 252-259



ISSN/ISBN: 0019-2805

PMID: 8473015

CD3+ cells are detectable in bone marrow of athymic mice homozygous for the nude mutation. As previously shown, cells expressing the gamma delta T-cell receptor (TcR) represent 30-40% of this T-cell population. Using V delta-specific, V alpha 4-specific, and C delta-specific primers, TcR delta-chain transcripts were reverse transcribed and polymerase chain reaction (PCR)-amplified from total RNA prepared from bone marrow cells (BMC) of 6-month-old NMRI nu/nu mice. Amplified TcR delta-chain cDNA was cloned, and 49 randomly selected clones derived from seven amplification reactions were sequenced. Sequence analyses showed: (1) more than 80% of the sequenced clones represented in-frame transcripts of the TcR delta-chain; (2) in-frame transcripts containing V delta 1-, V delta 2-, V delta 3-, V delta 4-, V delta 5-, V delta 6- and V alpha 4-gene segments were detectable in nude BMC; (3) V delta 2-, V delta 4- and V delta 5-containing transcripts were more abundant and more diverse than V delta 1- and V delta 3-containing transcripts; (4) extensive N-region diversity was present in the V delta-D delta 2 (N1), D delta 2-D delta 1 (N2) and D delta 1-J delta 1 (N3) junctional regions; (5) P nucleotide additions were present in many transcripts; and (6) unusual truncated, in-frame transcripts with deleted D- and J-region genes were detected. A large potential TcR delta-chain repertoire is thus present in nude BMC.

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Accession: 008495033

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