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Redefining the MED13L syndrome.

Abidemi Adegbola1,2,3, Luciana Musante4, Bert Callewaert5

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Genetic variants in MED13L, a protein regulating gene expression, are linked to intellectual disability (ID). This study identifies a new MED13L-associated syndrome with ID, distinct from congenital heart defects, highlighting language and motor impairments.

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Area of Science:

  • Genetics
  • Neurodevelopmental disorders
  • Molecular biology

Background:

  • The mediator complex subunit 13-like protein (MED13L) is crucial for transcriptional regulation.
  • Heterozygous MED13L variants have been associated with congenital heart defects and intellectual disability (ID).

Purpose of the Study:

  • To define a novel MED13L-related neurodevelopmental syndrome.
  • To broaden the understanding of the clinical spectrum associated with MED13L variants.

Main Methods:

  • Clinical evaluation of eight patients with MED13L variants.
  • Genetic analysis to identify novel MED13L variants.

Main Results:

  • Patients presented with a syndromic form of ID, including facial dysmorphism, speech and motor delays, hypotonia, and behavioral issues.
  • Complex congenital heart malformations were notably absent in this cohort.
  • Profound language impairment and articulatory deficits were prominent neurocognitive features.

Conclusions:

  • A novel syndrome associated with MED13L variants is defined, characterized by ID and distinct clinical features.
  • The clinical spectrum of MED13L-related disorders is significantly expanded, differentiating from previously described cardiac-associated phenotypes.
  • MED13L variants represent a significant genetic cause of syndromic ID with a prominent language phenotype.