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Molecular and cytogenetic analyses on Brazilian youths with pervasive developmental disorders
MarcosRobertoHigino Estécio1, Agnes Cristina Fett-Conte, Marileila Varella-Garcia
1Laboratório de Citogenética e Biologia Molecular, Instituto de Bio ciências, Letras e Ciências Exatas-UNESP Campus de São José do Rio Preto, SP, Brazil.
Insights
Genetic factors are linked to Pervasive Developmental Disorders (PDDs). This study found chromosomal abnormalities in youths with autism and PDDs, suggesting genetic testing is crucial for diagnosis.
Area of Science:
- Genetics
- Neurodevelopmental Disorders
- Cytogenetics
Background:
- Pervasive Developmental Disorders (PDDs) are neurodevelopmental conditions characterized by impaired communication and cognitive development.
- Genetic factors are increasingly recognized as contributors to PDDs, particularly in autism spectrum disorders.
Purpose of the Study:
- To evaluate cytogenetic and molecular parameters in a cohort of 30 youths diagnosed with autism or other PDDs.
- To investigate the association between chromosomal abnormalities and PDDs.
Main Methods:
- Cytogenetic analysis was performed on 30 youths with PDDs.
- Molecular testing was utilized to identify specific genetic abnormalities.
Main Results:
- Fragile X syndrome was the most frequent genetic abnormality identified.
- Tetrasomy for the 15q11-q13 region was detected in one patient with PDD-NOS.
- Mosaicism or a coincidental finding of inv(7)(p35q36) was observed in one patient with autism.
Conclusions:
- The high frequency of detected chromosomopathies supports the hypothesis that chromosomal abnormalities contribute to the development of PDDs.
- Routine cytogenetic and molecular assessment is recommended for all patients with PDDs to aid in diagnosis.
Abstract:
The Pervasive Developmental Disorders (PDDs) constitute a group of behavioral and neurobiological impairment conditions whose main features are delayed communicative and cognitive development. Genetic factors are reportedly associated with PDDs and particular genetic abnormalities are frequently found in specific diagnostic subgroups such as the autism spectrum disorders. This study evaluated cytogenetic and molecular parameters in 30 youths with autism or other PDDs. The fragile X syndrome was the most common genetic abnormality detected, presented by 1 patient with autism and 1 patient with PPD not-otherwise specified (PPD-NOS). One girl with PDD-NOS was found to have tetrasomy for the 15q11-q13 region, and one patient with autism exhibited in 2/100 metaphases an inv(7)(p35q36), thus suggesting a mosaicism 46,XX/46,XX,inv(7)(p15q36) or representing a coincidental finding. The high frequency of chromosomopathies support the hypothesis that PDDs may develop as a consequence to chromosomal abnormalities and justify the cytogenetic and molecular assessment in all patients with PDDs for establishment of diagnosis.