Severe mandibuloacral dysplasia caused by novel compound heterozygous ZMPSTE24 mutations in two Japanese siblings

Y. Miyoshi, M. Akagi, A. K. Agarwal, N. Namba, K. Kato-Nishimura, I. Mohri, M. Yamagata, S. Nakajima, S. Mushiake, M. Shima, R. J. Auchus, M. Taniike, A. Garg, K. Ozono

Research output: Contribution to journalArticle

30 Scopus citations

Abstract

Mandibuloacral dysplasia (MAD) is a rare autosomal recessive progeroid syndrome, characterized by mandibular hypoplasia, acroosteolysis affecting distal phalanges and clavicles, delayed closure of the cranial sutures, atrophic skin, and lipodystrophy. Recently, mutations in lamin A/C (LMNA) and zinc metalloprotease (ZMPSTE24), involved in post-translational processing of prelamin A to mature lamin A, have been identified in MAD kindreds. We now report novel compound heterozygous mutations in exon 1 (c.121C>T; p.Q41X) and exon 6 (c.743C>T; p.P248L) in ZMPSTE24 in two Japanese sisters, 7- and 3-year old, with severe MAD and characteristic facies and atrophic skin. The older sister had lipodystrophy affecting the chest and thighs but sparing abdomen. Their parents and a brother, who were healthy, had heterozygous mutations. The missense mutation, P248L, was not found in 100 normal subjects of Japanese origin. The mutant Q41X was inactive in a yeast halo assay; however, the mutant P248L retained near normal ZMPSTE24 activity. Immunoblots demonstrated accumulation of prelamin A in the patients'cell lysates from lymphoblasts. The lymphoblasts from the patients also revealed less intense staining for lamin A/C on immunofluorescence. We conclude that ZMPSTE24 deficiency results in accumulation of farnesylated prelamin A, which may be responsible for cellular toxicity and the MAD phenotype.

Original languageEnglish (US)
Pages (from-to)535-544
Number of pages10
JournalClinical Genetics
Volume73
Issue number6
DOIs
StatePublished - Jun 1 2008

Keywords

  • Lamin A
  • Lipodystrophy
  • Mandibuloacral dysplasia
  • Progeroid syndrome
  • ZMPSTE24

ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)

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    Miyoshi, Y., Akagi, M., Agarwal, A. K., Namba, N., Kato-Nishimura, K., Mohri, I., Yamagata, M., Nakajima, S., Mushiake, S., Shima, M., Auchus, R. J., Taniike, M., Garg, A., & Ozono, K. (2008). Severe mandibuloacral dysplasia caused by novel compound heterozygous ZMPSTE24 mutations in two Japanese siblings. Clinical Genetics, 73(6), 535-544. https://doi.org/10.1111/j.1399-0004.2008.00992.x