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조은경,Kumaki Satoru,Du Wei,Tsuchiya Shigeru,Kanegane Hirokazu,송창화,Noh Ha Young,Kim Young Ok,Kim So Yeon,Chung Hae Yul,김윤하,국훈 대한의학회 2004 Journal of Korean medical science Vol.19 No.1
X-linked severe combined immunodeficiency (X-SCID) is a rare, life-threatening immune disorder, caused by mutations in the c chain gene, which encodes an essen-tial component of the cytokine receptors for interleukin-2 (IL-2), IL-4, IL-7, IL-9, IL-15, and IL-21. A 13-month-old boy with recurrent infections who had reduced serum immunoglobulin levels and decreased numbers of CD3, CD16/56 cells was evalu-ated for c chain gene mutation and protein expression. The patient had a C-to-T point mutation at nucleotide position 690, one of the hot spots, resulting in a single amino acid substitution of cysteine for arginine (R226C), as determined by direct sequencing and PCR-RFLP. The patient’s mother was a heterozygous carrier. Per-cutaneous umbilical cord blood sampling was performed at the 6-month of gesta-tion in a subsequent pregnancy. As the immunophenotype of the fetus showed an identical pattern, the pregnancy was terminated and genetic analysis of the abortus confirmed recurrence. This is the first report of the molecular diagnosis of X-SCID in Korea. Genetic analysis of the c chain gene is useful for definite diagnosis and genetic counseling for X-SCID.