Pediatric Rare Diseases: Genetics and Diagnosis

A special issue of Genes (ISSN 2073-4425). This special issue belongs to the section "Molecular Genetics and Genomics".

Deadline for manuscript submissions: 15 September 2025 | Viewed by 1127

Special Issue Editor


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Guest Editor
Department of Medical Genetics, Sant Joan de Deu Children's Hospital and Institut de Recerca Sant Joan de Deu, Barcelona, Spain
Interests: dysmorphology; clinical genetics; epigenetics; rare diseases; pediatrics

Special Issue Information

Dear Colleagues,

Genetic factors are fundamental in the diagnosis of many pediatric rare diseases, as approximately 70% of these conditions present in childhood. Recent advances in genomic sequencing technologies have significantly improved the ability to diagnose many of these rare diseases, but approximately 50% of pediatric cases remain undiagnosed. This highlights the continued challenges in the field and the urgent need for more effective diagnostic tools, as well as the integration of genomics with various omics technologies in order to obtain more accurate diagnoses. The correct referral of patients to specialized medical genetics units, along with comprehensive phenotyping, is still essential for early interventions. In addition, the incorporation of artificial intelligence (AI), equitable access to advanced genetic studies, and collaborative international networks are playing an increasingly important role in improving diagnostic precision.

A correct diagnosis not only provides crucial information for affected patients and families but also offers valuable counseling, preventive strategies, and access to targeted therapies. In the era of precision medicine, a deeper understanding of genotype–phenotype correlations can enhance individualized therapeutic approaches, improving clinical outcomes for pediatric patients with rare diseases.

This Special Issue, titled “Pediatric Rare Diseases: Genetics and Diagnosis”, aims to offer an updated perspective on the genetic bases and diagnostic strategies for pediatric rare diseases, welcoming contributions that explore the latest advancements, challenges, and opportunities in this rapidly evolving field.

Dr. Antonio F. Martínez‐Monseny
Guest Editor

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Keywords

  • rare diseases
  • genetics
  • pediatrics
  • dysmorphology
  • molecular diagnosis
  • genetic syndromes
  • genome
  • precision medicine
  • phenotype

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Published Papers (2 papers)

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Research

7 pages, 906 KB  
Article
CRELD1-Associated Neurodevelopmental Disorder: Three New Individuals from Unrelated Families
by Jessica Archer, Shuxiang Goh, Christina Miteff, Sheridan O’Donnell, Kristen Park and Himanshu Goel
Genes 2025, 16(8), 972; https://doi.org/10.3390/genes16080972 - 18 Aug 2025
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Abstract
Background: CRELD1 encodes a cell adhesion molecule initially implicated in atrioventricular septal defects (AVSDs). More recently, biallelic CRELD1 variants have been associated with syndromic and non-syndromic neurodevelopmental disorders (NDDs). Methods: We describe three individuals from unrelated families with compound heterozygous CRELD1 variants, [...] Read more.
Background: CRELD1 encodes a cell adhesion molecule initially implicated in atrioventricular septal defects (AVSDs). More recently, biallelic CRELD1 variants have been associated with syndromic and non-syndromic neurodevelopmental disorders (NDDs). Methods: We describe three individuals from unrelated families with compound heterozygous CRELD1 variants, identified through exome sequencing. Clinical and genetic data were reviewed to delineate shared and divergent features. Results: All three patients presented with developmental delay, intellectual disability, seizures, hypotonia, and dysmorphic facial features. Patient 1 and patient 2 carried a recurrent variant combination previously reported in five individuals, while Patient 3 harboured the recurrent frameshift p.(Gln320Argfs*25) variant in trans with a novel missense variant. The milder clinical course of patient 3 highlights phenotypic heterogeneity. Notably, none of the patients had cardiac anomalies or immunological abnormalities, further expanding the clinical spectrum associated with CRELD1. Conclusion: Our findings reinforce genotype–phenotype correlations and provide additional evidence that biallelic CRELD1 variants underlie a distinct autosomal recessive neurodevelopmental disorder, broadening both the phenotypic and genetic spectrum of this emerging syndrome. Full article
(This article belongs to the Special Issue Pediatric Rare Diseases: Genetics and Diagnosis)
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14 pages, 1096 KB  
Article
Unveiling the Spectrum: Clinical and Molecular Insights from a Spanish Pediatric Cohort with Hypermobility Disorders and Ehlers-Danlos Syndrome
by David Foz Felipe, Dídac Casas-Alba, Sara H. Sadok, Marina Toral Fernández, Lourdes Vega-Hanna, Laura Plaza, Asunción Vicente Villa, Judith Armstrong, Encarna Guillén-Navarro and Antonio F. Martínez-Monseny
Genes 2025, 16(8), 925; https://doi.org/10.3390/genes16080925 - 31 Jul 2025
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Abstract
Diagnosing hypermobility disorders and Ehlers-Danlos syndrome (EDS) in children is challenging due to overlapping features with generalized joint hypermobility (GJH) and the lack of biomarkers. Background/Objectives: This study aims to describe the clinical and genetic features of pediatric EDS patients and identify [...] Read more.
Diagnosing hypermobility disorders and Ehlers-Danlos syndrome (EDS) in children is challenging due to overlapping features with generalized joint hypermobility (GJH) and the lack of biomarkers. Background/Objectives: This study aims to describe the clinical and genetic features of pediatric EDS patients and identify key comorbidities and correlations. Methods: This is a single-center observational study of patients under 18 diagnosed with suspicion of EDS (2018–2024) at a tertiary pediatric hospital. Diagnoses were made using 2017 criteria. Results: Forty-one patients (46% female; mean age 11.1 ± 2.8 years) were included. Based on 2017 criteria, 61% had hypermobile EDS (hEDS)/hypermobility spectrum disorder (HSD), 22% classical EDS, 7.3% vascular, and 9.7% other subtypes. Musculoskeletal (90.2%), cutaneous (68.3%), and psychiatric (56.1%) symptoms were most frequent. Significant associations included older age with psychiatric symptoms (p = 0.029), Beighton score with dislocations (p = 0.026), and less atrophic scarring in hEDS (p < 0.008). Genetic testing (73% performed) confirmed pathogenic variants (11 novel) in EDS with a known molecular cause. Conclusions: This study proposes a clinically guided approach and diagnostic algorithm for youth hypermobility, emphasizing precision medicine principles, while highlighting the urgent need for further research to identify hEDS biomarkers. Full article
(This article belongs to the Special Issue Pediatric Rare Diseases: Genetics and Diagnosis)
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