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1996-02-26
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Document 0173
DOCN M9620173
TI Mutation of Jak3 in a patient with SCID: essential role of Jak3 in
lymphoid development.
DT 9602
AU Russell SM; Tayebi N; Nakajima H; Riedy MC; Roberts JL; Aman MJ; Migone
TS; Noguchi M; Markert ML; Buckley RH; et al; Laboratory of Molecular
Immunology, National Heart, Lung, and; Blood Institute (NHLBI), National
Institutes of Health (NIH),; Bethesda, MD 20892, USA.
SO Science. 1995 Nov 3;270(5237):797-800. Unique Identifier : AIDSLINE
MED/96055115
AB Males with X-linked severe combined immunodeficiency (XSCID) have
defects in the common cytokine receptor gamma chain (gamma c) gene that
encodes a shared, essential component of the receptors of interleukin-2
(IL-2), IL-4, IL-7, IL-9, and IL-15. The Janus family tyrosine kinase
Jak3 is the only signaling molecule known to be associated with gamma c,
so it was hypothesized that defects in Jak3 might cause an XSCID-like
phenotype. A girl with immunological features indistinguishable from
those of XSCID was therefore selected for analysis. An Epstein-Barr
virus (EBV)-transformed cell line derived from her lymphocytes had
normal gamma c expression but lacked Jak3 protein and had greatly
diminished Jak3 messenger RNA. Sequencing revealed a different mutation
on each allele: a single nucleotide insertion resulting in a frame shift
and premature termination in the Jak3 JH4 domain and a nonsense mutation
in the Jak3 JH2 domain. The lack of Jak3 expression correlated with
impaired B cell signaling, as demonstrated by the inability of IL-4 to
activate Stat6 in the EBV-transformed cell line from the patient. These
observations indicate that the functions of gamma c are dependent on
Jak3 and that Jak3 is essential for lymphoid development and signaling.
DE Amino Acid Sequence Animal B-Lymphocytes/*IMMUNOLOGY Base Sequence
Case Report Cell Line, Transformed Female Frameshift Mutation Human
Infant Interleukin-4/PHARMACOLOGY Linkage (Genetics) Molecular
Sequence Data Phenotype Point Mutation Protein-Tyrosine
Kinase/DEFICIENCY/GENETICS/*PHYSIOLOGY Receptors,
Interleukin/PHYSIOLOGY RNA, Messenger/GENETICS/METABOLISM Severe
Combined Immunodeficiency/*ENZYMOLOGY/GENETICS/IMMUNOLOGY Signal
Transduction Support, U.S. Gov't, P.H.S. T-Lymphocytes/*IMMUNOLOGY
Trans-Activators/METABOLISM X Chromosome JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).