Female monozygotic twins discordant for hemophilia A due to nonrandom X-chromosome inactivation
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作者:
Bennett, Carolyn M.
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Childrens Hosp, Div Hematol, Div Hematol Oncol, Boston, MA 02115 USA
Dana Farber Canc Inst, Div Pediat Hematol Oncol, Boston, MA 02115 USA
Harvard Univ, Sch Med, Dept Pediat, Boston, MA 02115 USAChildrens Hosp, Div Hematol, Div Hematol Oncol, Boston, MA 02115 USA
Bennett, Carolyn M.
[1
,2
,3
]
Boye, Eileen
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Harvard Univ, Sch Dent Med, Dept Dev Biol, Boston, MA 02115 USAChildrens Hosp, Div Hematol, Div Hematol Oncol, Boston, MA 02115 USA
Boye, Eileen
[4
]
Neufeld, Ellis J.
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机构:
Childrens Hosp, Div Hematol, Div Hematol Oncol, Boston, MA 02115 USA
Dana Farber Canc Inst, Div Pediat Hematol Oncol, Boston, MA 02115 USA
Harvard Univ, Sch Med, Dept Pediat, Boston, MA 02115 USAChildrens Hosp, Div Hematol, Div Hematol Oncol, Boston, MA 02115 USA
Neufeld, Ellis J.
[1
,2
,3
]
机构:
[1] Childrens Hosp, Div Hematol, Div Hematol Oncol, Boston, MA 02115 USA
[2] Dana Farber Canc Inst, Div Pediat Hematol Oncol, Boston, MA 02115 USA
[3] Harvard Univ, Sch Med, Dept Pediat, Boston, MA 02115 USA
[4] Harvard Univ, Sch Dent Med, Dept Dev Biol, Boston, MA 02115 USA
We describe monozygotic female twins discordant for hemophilia A, born to a carrier mother and normal father. Affected twin A presented at age 1 year with excessive bruising and factor VIII procoagulant activity (FVIII:C) of less than 1% of normal. Twin B is an asymptomatic carrier with FVIII:C level of 42%. Peripheral blood DNA was tested for X-chromosome inactivation (methylation) patterns of the X-linked human androgen receptor gene, comparing the twins' patterns to parental. Twin A showed nonrandom inactivation skewed toward the paternal X, whereas twin B showed random X-inactivation. This is the first reported case of discordance for hemophilia A between female monozygotic twins.