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Rare CNVs provide novel insights into the molecular basis of GH and IGF-1 insensitivity

Cottrell, E; Cabrera, CP; Ishida, M; Chatterjee, S; Greening, J; Wright, N; Bossowski, A; ... Storr, HL; + view all (2020) Rare CNVs provide novel insights into the molecular basis of GH and IGF-1 insensitivity. European Journal of Endocrinology , 183 (6) pp. 581-595. 10.1530/EJE-20-0474. Green open access

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Abstract

Objective: Copy number variation (CNV) has been associated with idiopathic short stature, small for gestational age and Silver-Russell syndrome (SRS). It has not been extensively investigated in growth hormone insensitivity (GHI; short stature, IGF-1 deficiency and normal/high GH) or previously in IGF-1 insensitivity (short stature, high/normal GH and IGF-1). Design and methods: Array comparative genomic hybridisation was performed with ~60 000 probe oligonucleotide array in GHI (n = 53) and IGF-1 insensitivity (n = 10) subjects. Published literature, mouse models, DECIPHER CNV tracks, growth associated GWAS loci and pathway enrichment analyses were used to identify key biological pathways/novel candidate growth genes within the CNV regions. Results: Both cohorts were enriched for class 3-5 CNVs (7/53 (13%) GHI and 3/10 (30%) IGF-1 insensitivity patients). Interestingly, 6/10 (60%) CNV subjects had diagnostic/associated clinical features of SRS. 5/10 subjects (50%) had CNVs previously reported in suspected SRS: 1q21 (n = 2), 12q14 (n = 1) deletions and Xp22 (n = 1), Xq26 (n = 1) duplications. A novel 15q11 deletion, previously associated with growth failure but not SRS/GHI was identified. Bioinformatic analysis identified 45 novel candidate growth genes, 15 being associated with growth in GWAS. The WNT canonical pathway was enriched in the GHI cohort and CLOCK was identified as an upstream regulator in the IGF-1 insensitivity cohorts. Conclusions: Our cohort was enriched for low frequency CNVs. Our study emphasises the importance of CNV testing in GHI and IGF-1 insensitivity patients, particularly GHI subjects with SRS features. Functional experimental evidence is now required to validate the novel candidate growth genes, interactions and biological pathways identified.

Type: Article
Title: Rare CNVs provide novel insights into the molecular basis of GH and IGF-1 insensitivity
Location: England
Open access status: An open access version is available from UCL Discovery
DOI: 10.1530/EJE-20-0474
Publisher version: http://dx.doi.org/10.1530/EJE-20-0474
Language: English
Additional information: © 2020 The authors. This work is licensed under a Creative Commons Attribution 4.0 International License
Keywords: Adolescent, Child, Child, Preschool, Cohort Studies, DNA Copy Number Variations, Female, Genetic Testing, Human Growth Hormone, Humans, Infant, Insulin-Like Growth Factor I, Male
UCL classification: UCL
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Population Health Sciences > UCL GOS Institute of Child Health
URI: https://discovery.ucl.ac.uk/id/eprint/10113733
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