Cited by 5Autism Spectrum Disorder ResearchGenetics and Neurodevelopmental DisordersGenomics and Rare Diseases

Exome study of single nucleotide variations in patients with syndromic and non-syndromic autism reveals potential candidate genes for diagnostics and novel single nucleotide variants

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Belenska-Todorova, Lyudmila, Zamfirov, Milen, Todorov, Tihomir, Atemin, Slavena, Sleptsova, Mila, Pavlova, Zornitsa, Kadiyska, Tanya, Maver, Ales +2 more·2025·Cells

Abstract

Autism spectrum disorder (ASD) is a neurodevelopmental impairment that occurs due to mutations related to the formation of the nervous system, combined with the impact of various epigenetic and environmental factors. This necessitates the identification of the genetic variations involved in ASD pathogenesis. We performed whole exome sequencing (WES) in a cohort of 22 Bulgarian male and female individuals showing ASD features alongside segregation analyses of their families. A targeted panel of genes was chosen and analyzed for each case, based on a detailed examination of clinical data. Gene analyses revealed that specific variants concern key neurobiological processes involving neuronal architecture, development, and function. These variants occur in a number of genes, including SHANK3, DLG3, NALCN, and PACS2 which are critical for synaptic signaling imbalance, CEP120 and BBS5 for ciliopathies, SPTAN1 for spectrins structure, SPATA5, TRAK1, and VPS13B for neuronal organelles trafficking and integrity, TAF6, SMARCB1, DDX3X, MECP2, and SETD1A for gene expression, CDK13 for cell cycle control, ALDH5A1, DPYD, FH, and PDHX for mitochondrial function, and PQBP1, HUWE1, and WDR45 for neuron homeostasis. Novel single nucleotide variants in the SPATA5, CEP120, BBS5, SETD1A, TRAK1, VPS13B, and DDX3X genes have been identified and proposed for use in ASD diagnostics. Our data contribute to a better understanding of the complex neurobiological features of autism and are applicable in the diagnosis and development of personalized therapeutic approaches.

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  • In non-syndromic ASD, SHANK3 mutations primarily manifest as direct disruptions to synaptic architecture and function without consistent extra-neurological anomalies.

    “In non-syndromic ASD, SHANK3 mutations primarily manifest as direct disruptions to synaptic architecture and function without consistent extra-neurological anomalies (Hamoudi et al., 2022; Belenska-Todorova et al., 2025).”

    From Biological hierarchy from genotype to phenotype in syndromic and non-syndromic autism spectrum disorder (2026) · cites this paper as Belenska-Todorova et al., 2025

    Discussion §4.1 reports a SHANK3 variant in a patient with ASD and says it may disrupt synaptic function; the Conclusions also link ASD-associated mutations to synaptic architecture. The paper does not establish that SHANK3 mutations primarily have this effect in non-syndromic ASD or that they lack consistent extra-neurological anomalies. Its SHANK3 case also carries a DLG3 variant. (LLM, conf=0.86)

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Research works printed but not linked: 2

  1. [45]Sergi C. Parayil Sankaran B. Succinic Semialdehyde Dehydrogenase Deficiency StatPearls Treasure Island, FL, USA 2024 32809559
  2. [89]Stancheva M.A. T. Todorov T. Atemin S. Pavlova Z. Turturikov I. Kadiyska T. Marinova E. Popova D. Alanay Y. Clinical Presentation and Genetic Correlations in Bulgarian Patients with SPATA5 Gene Mutations Rare Dis. Orphan Drugs 2021 11 19 23 10.36865/2020.v11i4.126 · DOI

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Authors
Belenska-Todorova, L., Zamfirov, M., Todorov, T., Atemin, S., Sleptsova, M., Pavlova, Z., Kadiyska, T., Maver, A., Peterlin, B., & Todorova, A.
Affiliations
  • Sofia University "St. Kliment Ohridski" (BG)
  • Genetic Medico-Diagnostic Laboratory Genica, 1000 Sofia, Bulgaria
  • Independent Medico-Diagnostic Laboratory Genome Center “Bulgaria”, 1000 Sofia, Bulgaria
  • Medical University of Sofia (BG)
  • Clinical Institute of Genomic Medicine, University Medical Centre Ljubljana, 1000 Ljubljana, Slovenia
  • Ljubljana University Medical Centre (SI)
Corresponding author
Belenska-Todorova, Lyudmila
Venue
Cells
Publisher
MDPI AG
Published
2025-06-17
Volume
14
Issue
12
Pages
915
ISSN
2073-4409 (ISSN-L)
OpenAlex
W4411367483
Cited by
5
References
93
Citations by year
2026: 5
FWCI
2.85
Type
journal article
Language
en
Open access
Locations
  • Cells (publishedVersion, cc-by)
  • Preprints.org (acceptedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
European Union-NextGenerationEU
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Autism Spectrum Disorder Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetics and Neurodevelopmental Disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genomics and Rare Diseases
Keywords
autism spectrum disorder, single nucleotide variants, syndromic autism, non-syndromic autism, candidate genes, novel variants, SHANK3, DLG3, NALCN, ciliopathies, BBS5, SPTAN1, spectrin, TRAK1, VPS13B, MeCP2, SETD1A, mitochondrial function, SMARCB1, DDX3X, CDK13, cell cycle regulation, segregation analysis
MeSH terms
Autism Spectrum Disorder, Exome Sequencing, Adolescent, Adult, Autistic Disorder, Child, Child, Preschool, Female, Humans, Male, Genetic Predisposition to Disease, Polymorphism, Single Nucleotide, Genetic Association Studies, Exome

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