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8 Results Found

  • Review
  • Open Access
1 Citations
1,908 Views
17 Pages

29 May 2025

Kleefstra syndrome (KS) is a rare neurodevelopmental disorder associated with disruptions in the EHMT1 gene, often leading to intellectual disability, autism spectrum behaviors and epilepsy. The electroencephalogram (EEG) serves as a non-invasive too...

  • Case Report
  • Open Access
19 Citations
6,196 Views
9 Pages

De Novo Mutation in KMT2C Manifesting as Kleefstra Syndrome 2: Case Report and Literature Review

  • Maria Anna Siano,
  • Ilaria De Maggio,
  • Roberta Petillo,
  • Dario Cocciadiferro,
  • Emanuele Agolini,
  • Massimo Majolo,
  • Antonio Novelli,
  • Matteo Della Monica and
  • Carmelo Piscopo

11 March 2022

Diagnosis of pediatric intellectual disability (ID) can be difficult because it is due to a vast number of established and novel causes. Here, we described a full-term female infant affected by Kleefstra syndrome-2 presenting with neurodevelopmental...

  • Review
  • Open Access
2,188 Views
9 Pages

A Novel Frameshift Variant and a Partial EHMT1 Microdeletion in Kleefstra Syndrome 1 Patients Resulting in Variable Phenotypic Severity and Literature Review

  • Maria Tzetis,
  • Anastasios Mitrakos,
  • Ioanna Papathanasiou,
  • Vasiliki Koute,
  • Konstantina Kosma,
  • Roser Pons,
  • Aspasia Michoula,
  • Ioanna Grivea and
  • Aspasia Tsezou

29 April 2025

Background: Kleefstra syndrome 1(KLEFS1, OMIM#610253) is a rare neurodevelopmental disorder (NDD) instigated by heterozygous variants or microdeletions occurring in the 9q34.4 genomic region of the euchromatic histone methyltransferase-1 (EHMT1) gene...

  • Article
  • Open Access
8 Citations
4,059 Views
12 Pages

Success and Pitfalls of Genetic Testing in Undiagnosed Diseases: Whole Exome Sequencing and Beyond

  • Valeria Barili,
  • Enrico Ambrosini,
  • Vera Uliana,
  • Melissa Bellini,
  • Giulia Vitetta,
  • Davide Martorana,
  • Ilenia Rita Cannizzaro,
  • Antonietta Taiani,
  • Erika De Sensi and
  • Antonio Percesepe
  • + 3 authors

10 June 2023

Novel approaches to uncover the molecular etiology of neurodevelopmental disorders (NDD) are highly needed. Even using a powerful tool such as whole exome sequencing (WES), the diagnostic process may still prove long and arduous due to the high clini...

  • Article
  • Open Access
36 Citations
11,780 Views
17 Pages

7 April 2015

Roughly 20% of autism spectrum disorders (ASD) are syndromic with a well-established genetic cause. Studying the genes involved can provide insight into the molecular and cellular mechanisms of ASD. 2q23.1 deletion syndrome (causative gene, MBD5) is...

  • Review
  • Open Access
22 Citations
9,071 Views
18 Pages

Histone 4 Lysine 20 Methylation: A Case for Neurodevelopmental Disease

  • Rochelle N. Wickramasekara and
  • Holly A. F. Stessman

3 March 2019

Neurogenesis is an elegantly coordinated developmental process that must maintain a careful balance of proliferation and differentiation programs to be compatible with life. Due to the fine-tuning required for these processes, epigenetic mechanisms (...

  • Article
  • Open Access
9 Citations
3,764 Views
8 Pages

25 November 2021

Schizophrenia is a complex genetic disorder involving many common variants with modest effects and rare mutations with high penetrance. Rare mutations associated with schizophrenia are highly heterogeneous and private for affected individuals and fam...

  • Article
  • Open Access
762 Views
14 Pages

4 November 2025

KMT2C (histone lysine N-methyltransferase 2C, also known as MML3, myeloid/lymphoid or mixed-lineage leukemia 3) is a causal gene for Kleefstra syndrome 2, a rare neurodevelopmental disorder. Recent human genetic studies have identified it as a high-r...