Research: Extracranial midline defects in a patient with craniofrontonasal syndrome with a novel EFNB1 mutation.

Am J Med Genet A. 2020 Feb 5. doi: 10.1002/ajmg.a.61506. [Epub ahead of print]

Extracranial midline defects in a patient with craniofrontonasal syndrome with a novel EFNB1 mutation.

Acosta-Fernández E1Zenteno JC2,3Chacón-Camacho OF2,4Peña-Padilla C1Bobadilla-Morales L1,5Corona-Rivera A1,5Romo-Huerta CO6Zepeda-Romero LC7López-Marure E8Acosta-León J9García-Cruz D5Maciel-Cruz EJ5Corona-Rivera JR1,5.

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We report a female patient with craniofrontonasal syndrome (CFNS) who in addition showed other cranial and extracranial midline defects including partial corpus callosum agenesis, ocular melanocytosis, pigmentary glaucoma, duplex collecting system, uterus didelphys, and septate vagina. She was found to have a novel pathogenic variant in exon 5 of EFNB1, c.646G>T (p.Glu216*) predicted to cause premature protein truncation. From our review, we found at least 39 published CFNS patients with extracranial midline defects, comprising congenital diaphragmatic herniacongenital heart defects, umbilical hernia, hypospadias, and less frequently, sacrococcygeal teratomas, and internal genital anomalies in females. These findings support that the EFNB1 mutations have systemic consequences disrupting morphogenetic events at the extracranial midline. Though these are not rigorously included as midline defects, we found at least 10 CFNS patients with congenital anomalies of the kidney and urinary tract, all females. Additionally, uterus didelphys and ocular melanocytosis observed in our patient are proposed also as a previously unreported EFNB1-related midline defects. In addition, this case may be useful for considering the intentional search for genitourinary anomalies in future patients with CFNS, which will be helpful to define their frequency in this entity.

© 2020 Wiley Periodicals, Inc.


EFNB1; uterus didelphys; duplex collecting system; glaucoma; ocular melanocytosis; septate vaginaPMID: 32022998 DOI: 10.1002/ajmg.a.61506

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