J Korean Child Neurol Soc.  2017 Dec;25(4):266-270. 10.26815/jkcns.2017.25.4.266.

FOXP3 Mutation in a Patient with Proportional Microcephaly and Developmental Delay

Affiliations
  • 1Department of Pediatrics, Chonnam National University Medical School, Gwangju, Korea. ik052@jnu.ac.kr
  • 2School of Biological Sciences and Technology, Chonnam National University, Gwangju, Korea.
  • 3Department of Neurology, Chonnam National University Medical School, Gwangju, Korea.
  • 4Department of Laboratory Medicine, Chonnam National University Medical School, Gwangju, Korea.

Abstract

Most cases of microcephaly with growth failure and developmental delay have a genetic or metabolic etiology. Whole-exome sequencing (WES) has uncovered many causative genes and has also broadened their phenotypic spectrum. The present study applied WES to a boy with microcephaly, growth failure, developmental delay, seizures and atopic dermatitis, which reveal an unexpected frame-shift mutation (c.1248_1253delinsCT, NM_014009.3; p.Lys416Asnfs, NP_054728.2) in the forkhead box P3 gene (FOXP3). Mutations of this gene are known to result in immune dysregulation, polyendocrinopathy, enteropathy, X-linked (IPEX) syndrome. Mutation of FOXP3 was reverified by Sanger sequencing in the proband and his carrier mother. Flow-cytometry expression study of FOXP3 in peripheral white blood cells showed that the mean fluorescence intensity of FOXP3 was lower in the proband than in a normal control. We report a mild form of IPEX syndrome without chronic protracted diarrhea or major infections, instead presenting with proportional microcephaly, growth failure, developmental delay, seizures and atopic dermatitis.

Keyword

Microcephaly; Failure to thrive; Growth and development; Gene; Seizures; Atopic dermatitis

MeSH Terms

Dermatitis, Atopic
Diarrhea
Failure to Thrive
Fluorescence
Growth and Development
Humans
Leukocytes
Male
Microcephaly*
Mothers
Seizures
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