A Case of Pseudohypoparathyroidism Type Ib Caused by Aberrant Methylation in the GNAS Complex Locus
Laboratory Medicine Online
; : 83-87, 2017.
Article
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| WPRIM
| ID: wpr-169860
Biblioteca responsable:
WPRO
ABSTRACT
Pseudohypoparathyroidism (PHP) is a rare disorder caused by genetic and epigenetic aberrations in the GNAS complex locus resulting in impaired expression of stimulatory G protein (Gsα). PHP type Ib (PHP-Ib) is characterized by hypocalcemia and hyperphosphatemia due to renal resistance to the parathyroid hormone, and is distinguished from PHP-Ia by the absence of osteodystrophic features. An 11-yr-old boy presented with poor oral intake and cramping lower limb pain after physical activity. Laboratory studies revealed hypocalcemia, hyperphosphatemia, and increased parathyroid hormone levels. The GNAS complex locus was evaluated using the methylation-specific multiplex ligation-dependent probe amplification (MS-MLPA) assay. Gain of methylation in the NESP55 domain and loss of methylation in the antisense (AS) transcript, XL, and A/B domains in the maternal allele were observed. Consequently, we present a case of PHP-Ib diagnosed using MS-MLPA.
Palabras clave
Texto completo:
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Índice:
WPRIM
Asunto principal:
Hormona Paratiroidea
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Seudohipoparatiroidismo
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Proteínas de Unión al GTP
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Extremidad Inferior
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Alelos
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Hiperfosfatemia
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Epigenómica
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Reacción en Cadena de la Polimerasa Multiplex
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Hipocalcemia
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Metilación
Límite:
Humans
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Male
Idioma:
En
Revista:
Laboratory Medicine Online
Año:
2017
Tipo del documento:
Article