Novel Gain of Function Mutations of the Calcium-sensing Receptor in Two Patients with PTH-deficient Hypocalcemia
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概要
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Among 15 patients with PTH-deficient idiopathic hypocalcemia, we found two novel missense mutations in the calcium-sensing receptor (CaSR). Patient 1, who developed severe hypocalcemia (5.0 mg/dL) and seizures after birth, had a heterozygous de novo missense mutation in the transmembrane domain (A844P). The patient is currently receiving a minimum dose of 1α-OHD3 (0.5 μg/day) to maintain the serum calcium level at 6 mg/dL and thus prevent seizures. Patient 2 had asymptomatic hypocalcemia (7.5 mg/dL) and also had a heterozygous missense mutation in the extracellular domain (E228G). These findings suggest that gene analysis of CaSR should be performed in patients with idiopathic hypocalcemia, particularly when it occurs in the neonatal period.
著者
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Takano Kazue
Department Of Endocrinology Clinical Institute Of Endocrinology Tokyo Women's Medical Universit
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Sato Kanji
Department Of Medicine Institute Of Clinical Endocrinology Tokyo Women's Medical College
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Yamazaki Kazuko
Department Of Infection And Host Defense Shinshu University Graduate School Of Medicine Shinshu Univ
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Nakajima Kishiko
Department Of Medicine Institute Of Clinical Endocrinology Tokyo Women's Medical University
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Kimura Hironari
Department Of Medicine Institute Of Clinical Endocrinology Tokyo Women's Medical University
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NAKAJIMA Kishiko
Department of Medicine, Institute of Clinical Endocrinology, Tokyo Women's Medical University
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Miyoshi Hitoshi
Miyoshi Clinic
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Yamazaki Kazuko
Department of Medicine, Institute of Clinical Endocrinology, Tokyo Women's Medical University
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