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Updated: Jun 2, 2026
Chromosome Preparation From Cultured Cells
Published on: January 28, 2014
[Use of MLPA test in the detection of subtelomeric rearrangements--case report]
Cristina Rusu1, Elena Neagu, Cristina Skrypnyk
1Facultatea de Medicină, Disciplina de Genetică Medicală, Universitatea de Medicină si Farmacie Gr.T. Popa Iaşi.
Abstract:
Genetic causes of mental retardation (MR) are heterogeneous, but subtelomeric rearrangements are an important one. MLPA technique provides the best results in case detection. We have used MLPA to identify subtelomeric rearrangements in children with idiopatic MR. The protocol included: clinical selection; karyotype; antiFMRP test; MLPA. We have selected cases using de Vries diagnostic score. Patient data were recorded in a database. The group was formed of 142 MR children. In 24 (16.9%) the karyotype was abnormal. 16 cases (11.3%) presented speech delay/autism, but antiFMRP test was normal. 60 MLPA tests were done: 46 cases (76.7% were normal, 6 (10%) abnormal, 4 (6.7%) had polymorphism and 4 (6.7%) could not be interpreted. Clinical features of the cases identified are illustrated. In conclusion, the diagnostic score is useful in case selection for further testing and MLPA proves to be efficient in diagnosing subtelomeric rearrangements as a possible cause of idiopatic MR.
Insights
Subtelomeric rearrangements are a key genetic cause of idiopathic intellectual disability (ID). Multiplex Ligation-dependent Probe Amplification (MLPA) effectively identifies these rearrangements in children with ID.
Area of Science:
- Genetics
- Neurodevelopmental Disorders
Background:
- Intellectual disability (ID) has diverse genetic origins, with subtelomeric chromosomal rearrangements being a significant factor.
- Multiplex Ligation-dependent Probe Amplification (MLPA) is a sensitive technique for detecting these specific genetic alterations.
Observation:
- A study involving 142 children with idiopathic ID utilized clinical selection, karyotyping, anti-FMRP testing, and MLPA.
- Karyotype analysis revealed abnormalities in 16.9% of cases, while 11.3% showed speech delay/autism with normal anti-FMRP results.
- MLPA testing was performed on 60 cases, identifying subtelomeric rearrangements in 10%.
Findings:
- The de Vries diagnostic score proved useful for selecting appropriate cases for genetic testing.
- MLPA demonstrated high efficiency in diagnosing subtelomeric rearrangements as a cause of idiopathic ID.
- Subtelomeric rearrangements were identified as a notable cause of idiopathic intellectual disability in the studied cohort.
Implications:
- This study highlights the utility of MLPA in diagnosing subtelomeric rearrangements contributing to idiopathic ID.
- The findings support the integration of MLPA into the diagnostic workup for children with unexplained intellectual disability.
- Improved diagnostic yield for genetic causes of ID can facilitate earlier intervention and genetic counseling.
