IGF1R Gene Alterations in Children Born Small for Gestitional Age (SGA)
DOI:
https://doi.org/10.3889/oamjms.2018.416Keywords:
Small for gestational age (SGA), IGF1 receptor (IGF1R), IGF1R gene, Multiplex Ligation-dependent Probe Amplification (MLPA), direct sequencingAbstract
BACKGROUND: Small for gestational age (SGA)-born children are a heterogeneous group with few genetic causes reported. Genetic alterations in the IGF1 receptor (IGF1R) are found in some SGA children.
AIM: To investigate whether alterations in IGF1R gene are present in SGA born children.
PATIENTS AND METHODS: We analysed 64 children born SGA who stayed short (mean -3.25 ± 0.9 SDS) within the first 4 years of age, and 36 SGA children who caught up growth (0.20 ± 1.1 SDS). PCR products of all coding IGF1R exons were screened by dHPLC followed by direct sequencing of conspicuous fragments to identify small nucleotide variants. The presence of IGF1R gene copy number alterations was determined by Multiplex Ligation-dependent Probe Amplification (MLPA).
RESULTS: The cohort of short SGA born children revealed a heterozygous, synonymous variant c.3453C > T in one patient and a novel heterozygous 3 bp in-frame deletion (c.3234_3236delCAT) resulting in one amino acid deletion (p.Ile1078del) in another patient. The first patient had normal serum levels of IGF1. The second patient had unusually low IGF1 serum concentrations (-1.57 SD), which contrasts previously published data where IGF1 levels rarely are found below the age-adjusted mean.
CONCLUSIONS: IGF1R gene alterations were present in 2 of 64 short SGA children. The patients did not have any dysmorphic features or developmental delay. It is remarkable that one of them had significantly decreased serum concentrations of IGF1. Growth response to GH treatment in one of the patients was favourable, while the second one discontinued the treatment, but with catch-up growth.
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Copyright (c) 2018 Aleksandra Janchevska, Marina Krstevska-Konstantinova, Heike Pfäffle, Marina Schlicke, Nevenka Laban, Velibor Tasic, Zoran Gucev, Kristina Mironska, Aleksandar Dimovski, Jürgen Kratzsch, Jürgen Klammt, Roland Pfäffle
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