Central Precocious Puberty in a Girl and Early Puberty in Her Brother Caused by a Novel Mutation in the MKRN3 Gene (original) (raw)
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1Division of Endocrinology, Metabolism, and Diabetes, First Department of Pediatrics, Medical School, National and Kapodistrian University of Athens, “Aghia Sophia” Children's Hospital, GR-11527 Athens, Greece
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Catherine Dacou-Voutetakis
1Division of Endocrinology, Metabolism, and Diabetes, First Department of Pediatrics, Medical School, National and Kapodistrian University of Athens, “Aghia Sophia” Children's Hospital, GR-11527 Athens, Greece
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1Division of Endocrinology, Metabolism, and Diabetes, First Department of Pediatrics, Medical School, National and Kapodistrian University of Athens, “Aghia Sophia” Children's Hospital, GR-11527 Athens, Greece
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Christina Kanaka-Gantenbein
1Division of Endocrinology, Metabolism, and Diabetes, First Department of Pediatrics, Medical School, National and Kapodistrian University of Athens, “Aghia Sophia” Children's Hospital, GR-11527 Athens, Greece
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1Division of Endocrinology, Metabolism, and Diabetes, First Department of Pediatrics, Medical School, National and Kapodistrian University of Athens, “Aghia Sophia” Children's Hospital, GR-11527 Athens, Greece
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1Division of Endocrinology, Metabolism, and Diabetes, First Department of Pediatrics, Medical School, National and Kapodistrian University of Athens, “Aghia Sophia” Children's Hospital, GR-11527 Athens, Greece
*Address all correspondence and requests for reprints to: Dr Antonis Voutetakis, Division of Endocrinology, Metabolism, and Diabetes, First Department of Pediatrics, Medical School, National and Kapodistrian University of Athens, “Aghia Sophia” Children's Hospital, Thivon and Papadiamantopoulou Street, Goudi, GR-11527, Athens, Greece.
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Received:
12 November 2013
Accepted:
08 January 2014
Cite
Nikolaos Settas, Catherine Dacou-Voutetakis, Maria Karantza, Christina Kanaka-Gantenbein, George P. Chrousos, Antonis Voutetakis, Central Precocious Puberty in a Girl and Early Puberty in Her Brother Caused by a Novel Mutation in the MKRN3 Gene, The Journal of Clinical Endocrinology & Metabolism, Volume 99, Issue 4, 1 April 2014, Pages E647–E651, https://doi.org/10.1210/jc.2013-4084
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Context:
Central precocious puberty (CPP), defined as the development of secondary sex characteristics prior to age 8 years in girls and 9 years in boys, results from the premature activation of the hypothalamic-pituitary-gonadal axis. Mutations in the imprinted gene MKRN3 have been recently implicated in familial cases of CPP.
Objective:
The objective of the study was to uncover the genetic cause of CPP in a family with two affected siblings.
Design and participants:
The entire coding region of the paternally expressed MKRN3 gene was sequenced in two siblings, a girl with CPP and her brother with early puberty, their parents, and their grandparents.
Results:
A novel heterozygous missense variant in the MKRN3 gene (p.C340G) was detected in the two affected siblings, their unaffected father, and the paternal grandmother. As expected, the mutated allele followed an imprinted mode of inheritance within the affected family. In silico analysis predicts the mutation as possibly damaging in all five software packages used. Furthermore, structural alignment of the ab initio native and mutant MKRN3 models predicts that the p.C340G mutation leads to significant structural perturbations in the 3-dimensional structure of the C3HC4 really interesting new gene motif of the protein, further emphasizing the functional implications of the novel MKRN3 alteration.
Conclusions:
We report a novel MKRN3 mutation (p.C340G) in a girl with CPP and her brother with early puberty. MKRN3 alterations should be suspected in all cases with familial CPP or early puberty, especially if male patients are also involved or the precocious puberty trend does not follow the usually observed mother-to-daughter inheritance.
Copyright © 2014 by The Endocrine Society
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