Abstract
The X chromosome inactivation analysis of eight female relatives was performed to elucidate the X chromosome gene defect of six male hypogammaglobulinaemic individuals. The patients had diminished numbers of circulating B-cells and no relevant family history. The methylation status of three X-linked genes, phosphoglycerate kinase, hypoxanthine phosphoribosyl transferase and DXS255, was determined on DNA from Epstein-Barr virus-transformed B-cell lines established from the female relatives. The methylation pattern of at least one gene was informative in all eight females examined. While both alleles were equally methylated in four of eight females, the remaining four female relatives of three hypogammaglobulinaemia patients exhibited a non-random methylation pattern in their B-cells, suggesting that these three patients represented sporadic cases of X-linked agammaglobulinaemia (XLA). The clinical or immunological status of these three patients did not differ from the remaining two who had early onset hypogammaglobulinaemia and who were tentatively diagnosed as having common variable immunodeficiency. The sixth patient had recurrent infections after undergoing surgical removal of a brain tumour at 22 years of age, although his immunological features did not distinguish him from the other patients. X chromosome inactivation analysis can be useful in differentiating XLA from hypogammaglobulinaemia in male patients.
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Abbreviations
- BLC:
-
B-lymphoblastoid cells
- CVID:
-
common variable immunodeficiency
- EBV:
-
Epstein-Barr virus
- HPRT:
-
hypoxanthine phosphoribosyl transferase
- PBMC:
-
peripheral blood mononuclear cells
- PGK:
-
phosphoglycerate kinase
- XLA:
-
X-linked agammaglobulinaemia
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Tsuge, I., Matsuoka, H., Abe, T. et al. X chromosome inactivation analysis to distinguish sporadic cases of X-linked agammaglobulinaemia from common variable immunodeficiency. Eur J Pediatr 152, 900–904 (1993). https://doi.org/10.1007/BF01957526
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DOI: https://doi.org/10.1007/BF01957526