Abstract
Athelia is a very rare entity that is defined by the absence of the nipple–areola complex. It can affect either sex and is mostly part of syndromes including other congenital or ectodermal anomalies, such as limb-mammary syndrome, scalp–ear–nipple syndrome, or ectodermal dysplasias. Here, we report on three children from two branches of an extended consanguineous Israeli Arab family, a girl and two boys, who presented with a spectrum of nipple anomalies ranging from unilateral hypothelia to bilateral athelia but no other consistently associated anomalies except a characteristic eyebrow shape. Using homozygosity mapping after single nucleotide polymorphism (SNP) array genotyping and candidate gene sequencing we identified a homozygous frameshift mutation in PTPRF as the likely cause of nipple anomalies in this family. PTPRF encodes a receptor-type protein phosphatase that localizes to adherens junctions and may be involved in the regulation of epithelial cell–cell contacts, peptide growth factor signaling, and the canonical Wnt pathway. Together with previous reports on female mutant Ptprf mice, which have a lactation defect, and disruption of one allele of PTPRF by a balanced translocation in a woman with amastia, our results indicate a key role for PTPRF in the development of the nipple–areola region.
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G. Borck and L. de Vries contributed equally.
C. Kubisch and L. Basel-Vanagaite jointly supervised this work.
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Supplementary Fig. 1. Eyebrow shape in a patient with intellectual disability, normal nipples, and no PTPRF mutation.
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Borck, G., de Vries, L., Wu, HJ. et al. Homozygous truncating PTPRF mutation causes athelia. Hum Genet 133, 1041–1047 (2014). https://doi.org/10.1007/s00439-014-1445-1
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DOI: https://doi.org/10.1007/s00439-014-1445-1