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Meier-Gorlin syndrome: Growth and secondary sexual development of a microcephalic primordial dwarfism disorder

Lookup NU author(s): Dr Michael Wright

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Abstract

MeierGorlin syndrome (MGS) is a rare autosomal recessive disorder characterized by primordial dwarfism, microtia, and patellar aplasia/hypoplasia. Recently, mutations in the ORC1, ORC4, ORC6, CDT1, and CDC6 genes, encoding components of the pre-replication complex, have been identified. This complex is essential for DNA replication and therefore mutations are expected to impair cell proliferation and consequently could globally reduce growth. However, detailed growth characteristics of MGS patients have not been reported, and so this is addressed here through study of 45 MGS patients, the largest cohort worldwide. Here, we report that growth velocity (length) is impaired in MGS during pregnancy and first year of life, but, thereafter, height increases in paralleled normal reference centiles, resulting in a mean adult height of -4.5 standard deviations (SD). Height is dependent on ethnic background and underlying molecular cause, with ORC1 and ORC4 mutations causing more severe short stature and microcephaly. Growth hormone therapy (n?=?9) was generally ineffective, though in two patients with significantly reduced IGF1 levels, growth was substantially improved by GH treatment, with 2SD and 3.8 SD improvement in height. Growth parameters for monitoring growth in future MGS patients are provided and as well we highlight that growth is disproportionately affected in certain structures, with growth related minor genital abnormalities (42%) and mammary hypoplasia (100%) frequently present, in addition to established effects on ears and patellar growth. (c) 2012 Wiley Periodicals, Inc.

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Author(s): de Munnik SA, Otten BJ, Schoots J, Bicknell LS, Aftimos S, Al-Aama JY, van Bever Y, Bober MB, Borm GF, Clayton-Smith J, Deal CL, Edrees AY, Feingold M, Fryer A, van Hagen JM, Hennekam RC, Jansweijer MCE, Johnson D, Kant SG, Opitz JM, Ramadevi AR, Reardon W, Ross A, Sarda P, Schrander-Stumpel CTRM, Sluiter AE, Temple IK, Terhal PA, Toutain A, Wise CA, Wright M, Skidmore DL, Samuels ME, Hoefsloot LH, Knoers NVAM, Brunner HG, Jackson AP, Bongers EMHF

Publication type: Article

Publication status: Published

Journal: American Journal of Medical Genetics Part A

Year: 2012

Volume: 158A

Issue: 11

Pages: 2733-2742

Print publication date: 28/09/2012

ISSN (print): 1552-4825

ISSN (electronic): 1552-4833

Publisher: John Wiley & Sons, Inc.

DOI: 10.1002/ajmg.a.35681

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