TY - JOUR
T1 - Skewed X-inactivation in a manifesting carrier of X-linked myotubular myopathy and in her non-manifesting carrier mother
AU - Tanner, S. M.
AU - ØRstavik, K. H.
AU - Kristiansen, M.
AU - Lev, D.
AU - Lerman-Sagie, T.
AU - Sadeh, M.
AU - Liechti-Gallati, S.
N1 - Funding Information:
Acknowledgements Our collaboration was supported by the International Consortium on Myotubular Myopathy of the European Neuromuscular Centre (ENMC, Baarn, The Netherlands). This work was supported by the Swiss National Science Foundation (grant no. 32-043631.95), the Anders Jahre’s Foundation for Promotion of Science, the Fridtjof Nansen Foundation, the Research Council of Norway, and the Ullevål University Hospital Research Forum.
PY - 1999
Y1 - 1999
N2 - X-linked recessive myotubular myopathy (XLMTM) is a muscle disorder usually affecting newborn males. In the majority of cases, muscle weakness and hypotonia lead to a rapid demise at neonatal age. The responsible MTM1 gene is located in proximal Xq28. Heterozygous carriers are described as being asymptomatic but, in a few cases, mild facial weakness has been reported. We report a family in which a 39-year old female showed severe progressive muscle weakness. XLMTM was initially diagnosed in the male offspring of one of the patient's sisters. The patient, one of her sisters, and their mother were heterozygous carriers for a common MTM1 gene mutation. We found an extremely skewed X-inactivation pattern in the patient and, in the opposite direction, in her non-manifesting carrier mother, thus explaining her normal phenotype and indicating a possible inheritance of skewed X-inactivation. Linkage analysis excluded a possible involvement of the XIST locus at Xq13.
AB - X-linked recessive myotubular myopathy (XLMTM) is a muscle disorder usually affecting newborn males. In the majority of cases, muscle weakness and hypotonia lead to a rapid demise at neonatal age. The responsible MTM1 gene is located in proximal Xq28. Heterozygous carriers are described as being asymptomatic but, in a few cases, mild facial weakness has been reported. We report a family in which a 39-year old female showed severe progressive muscle weakness. XLMTM was initially diagnosed in the male offspring of one of the patient's sisters. The patient, one of her sisters, and their mother were heterozygous carriers for a common MTM1 gene mutation. We found an extremely skewed X-inactivation pattern in the patient and, in the opposite direction, in her non-manifesting carrier mother, thus explaining her normal phenotype and indicating a possible inheritance of skewed X-inactivation. Linkage analysis excluded a possible involvement of the XIST locus at Xq13.
UR - http://www.scopus.com/inward/record.url?scp=0032908834&partnerID=8YFLogxK
U2 - 10.1007/s004390050943
DO - 10.1007/s004390050943
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AN - SCOPUS:0032908834
SN - 0340-6717
VL - 104
SP - 249
EP - 253
JO - Human Genetics
JF - Human Genetics
IS - 3
ER -