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Summary

Excerpted from the GeneReview: MN1 C-Terminal Truncation Syndrome
Individuals with MN1 C-terminal truncation (MCTT) syndrome have mild-to-moderate intellectual disability, severe expressive language delay, dysmorphic facial features (midface hypoplasia, downslanting palpebral fissures, hypertelorism, exophthalmia, short upturned nose, and small low-set ears), and distinctive findings on brain imaging (including perisylvian polymicrogyria and atypical rhombencephalosynapsis). Mild-to-moderate prelingual hearing loss (usually bilateral, conductive, and/or sensorineural) is common. Generalized seizures (observed in the minority of individuals) are responsive to anti-seizure medication. There is an increased risk for craniosynostosis and, thus, increased intracranial pressure. To date, 25 individuals with MCTT syndrome have been identified.

Genes See tests for all associated and related genes

  • Also known as: CEBALID, MGCR, MGCR1, MGCR1-PEN, dJ353E16.2, MN1
    Summary: MN1 proto-oncogene, transcriptional regulator

  • Also known as: ACN, BANF, SCH, SWNV, merlin-1, NF2
    Summary: NF2, moesin-ezrin-radixin like (MERLIN) tumor suppressor

  • Also known as: IBGC5, PDGF-2, PDGF2, SIS, SSV, c-sis, PDGFB
    Summary: platelet derived growth factor subunit B

  • Also known as: 10q23del, BZS, CWS1, DEC, GLM2, MHAM, MMAC1, PTEN1, PTENbeta, TEP1, PTEN
    Summary: phosphatase and tensin homolog

  • Also known as: BAF57, CSS5, SMARCE1
    Summary: SWI/SNF related, matrix associated, actin dependent regulator of chromatin, subfamily e, member 1

  • Also known as: BCNS2, JBTS32, PRO1280, SUFUH, SUFUXL, SUFU
    Summary: SUFU negative regulator of hedgehog signaling

Clinical features

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