SFEBES2007 Poster Presentations Growth and development (10 abstracts)
An intronic growth hormone receptor mutation causing activation of a pseudoexon is associated with a broad spectrum of growth hormone insensitivity phenotypes
Alessia David 1 , Cecilia Camacho-Hubner 1 , Amrit Bhangoo 2 , Stephen Rose 3 , Farideh Miraki-Moud 1 , Scott Akker 1 , Gary Butler 4 , Svetlana Ten 2 , Peter Clayton 5 , Adrian Clark 1 , Martin Savage 1 & Lou Metherell 1
1Centre for Endocrinology, WHRI, Barts and the London, Queen Mary University, London, United Kingdom; 2Peadiatric Endocrinology Division, Infant’s and Children’s Hospital of Brooklyn at Maimonides, Brooklyn, New York, United States; 3Department of Paediatrics, Heartlands Hospital, Birmingham, United Kingdom; 4Department of Paediatrics, Leeds General Infirmary, Leeds, United Kingdom; 5Department of Paediatric Endocrinology, Royal Manchester Children’s Hospital, Manchester, United Kingdom.
Inherited growth hormone insensitivity (GHI) is usually caused by mutations in the GH receptor (GHR). Patients present with short stature associated with a mid-facial hypoplasia (Laron facial features) or with normal facial appearance. We previously described an intronic mutation in the GHR gene (A−1 to G−1 substitution in intron 6) resulting in the activation of a pseudoexon (6Ψ) in four related GHI patients with normal facial features. The mutant GHR has 36 additional amino acids resulting in impaired cell surface trafficking. We have now found seven more GHI patients with the pseudoexon mutation and in the present study we analyze the clinical and genetic characteristics of this cohort and assess the genotype-phenotype relationship.
Auxological, biochemical, genetic and haplotype data were collected.
One patient belongs to the same extended family previously reported. Her height is −5 SDS and she has normal facial features. Her IGF-I levels are in the low-normal range for age like the other family members. The six unrelated patients, four of whom have typical LS facial features, have heights ranging from −3.4 to −6.0 SDS and IGF-I levels that vary from normal to undetectable. All seven patients have normal GHBP levels and low ALS levels. We hypothesize that the marked difference in biochemical and clinical phenotypes might be due to variations in the splicing efficiency of the pseudoexon.
In conclusion, activation of the pseudoexon in the GHR gene can lead to a variety of GHI phenotypes. Therefore, screening for the presence of this mutation should be carried out in all patients without mutations in the GHR coding exons.
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Endocrine Abstracts
ISSN 1470-3947 (print) | ISSN 1479-6848 (online)
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