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J Clin Endocrinol Metab DOI:10.1210/jc.2013-3106

A novel deletion of IGF1 in a patient with idiopathic short stature provides insight Into IGF1 haploinsufficiency.

Publication TypeJournal Article
Year of Publication2014
AuthorsBatey, L, Moon, JE, Yu, Y, Wu, B, Hirschhorn, JN, Shen, Y, Dauber, A
JournalJ Clin Endocrinol Metab
Volume99
Issue1
PagesE153-9
Date Published2014 Jan
ISSN1945-7197
KeywordsChild, DNA Copy Number Variations, Dwarfism, Gene Deletion, Growth Charts, Haploinsufficiency, Humans, Insulin-Like Growth Factor I, Male
Abstract

CONTEXT: Short stature is a common reason for referral to pediatric endocrinology centers. Frequently, the underlying etiology of short stature is unknown, resulting in a diagnosis of idiopathic short stature. Rare genetic defects in the GH/IGF-1 axis have been found to cause short stature.

OBJECTIVE: The objective of this study was to identify the genetic etiology of short stature in a patient with Idiopathic Short Stature and to review the clinical presentation of patients with genetic defects in IGF1, and specifically IGF-1 haploinsufficiency.

DESIGN/SETTING/PARTICIPANTS: The index patient was evaluated at an academic medical center, and DNA was obtained from the proband and both parents.

INTERVENTION: Genome-wide copy number analysis was performed in the proband with confirmatory quantitative PCR in the proband and his parents.

MAIN OUTCOME MEASURE: We measured novel copy number variants (CNVs) thought to explain the patient's short stature.

RESULTS: CNV analysis revealed that the proband carried a paternally inherited heterozygous IGF1 gene deletion. His phenotypic features are consistent with those found in previous case reports of IGF-1 deficiency.

CONCLUSIONS: This study, as the first case of a complete heterozygous 1GF1 deletion, provides insight into the effects of true IGF-1 haploinsufficiency. Given the similarities in phenotype between the present proband and those previously described, it is highly likely that his IGF1 deletion is the cause for his short stature. Broadly, this study emphasizes how CNV analysis and other genetic sequencing techniques are evolving as an important tool to identify genetic causes underlying human disease, allowing for improved diagnosis and targeted treatment.

URLhttp://press.endocrine.org/doi/abs/10.1210/jc.2013-3106?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub%3dpubmed
DOI10.1210/jc.2013-3106
Pubmed

http://www.ncbi.nlm.nih.gov/pubmed/24243634?dopt=Abstract

Alternate JournalJ. Clin. Endocrinol. Metab.
PubMed ID24243634
PubMed Central IDPMC3879666
Grant ListK23 HD073351 / HD / NICHD NIH HHS / United States
UL1 RR025758 / RR / NCRR NIH HHS / United States
K23HD073351 / HD / NICHD NIH HHS / United States
UL1 RR 025758 / RR / NCRR NIH HHS / United States