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Related Concept Videos

Comparing Copy Number Variations and SNPs02:26

Comparing Copy Number Variations and SNPs

Sequencing of the human genome has opened up several best-kept secrets of the genome. Scientists have identified thousands of genome variations that exist within a population. These variations can be a single nucleotide or a larger chromosomal variation.
Copy number variations or CNVs are the structural variations that cover more than 1kb of DNA sequence. The single nucleotide polymorphism (SNP), on the other hand, is a single nucleotide change or a point mutation that is found in more than 1%...
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Intellectual Disability01:29

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Intellectual disability (ID) is a neurodevelopmental condition characterized by deficits in intellectual and adaptive functioning that manifest during the developmental period. This condition encompasses challenges in reasoning, memory, problem-solving, and learning, accompanied by impairments in everyday life skills, such as communication, self-care, and social interactions. Intellectual disability affects approximately 1% of the population in the United States, impacting an estimated 5...
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In animals, gender is determined by the number and type of sex chromosome. For example, human females have two X chromosomes, and males have one X and one Y chromosome, whereas C.elegans with one X chromosome is a male, and the one with two X chromosomes is a hermaphrodite.
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Searching for Copy Number Changes in Nonsyndromic X-Linked Intellectual Disability.

G E Utine1, P Ö Kiper, Y Alanay

  • 1Clinical Genetics Unit, Hacettepe University Faculty of Medicine, Ankara, Turkey.

Molecular Syndromology
|April 19, 2012
PubMed
Summary
This summary is machine-generated.

Multiplex ligation-dependent probe amplification (MLPA) identified gene duplications in patients with intellectual disability (ID). This method is efficient for diagnosing X-linked ID (XLID) when other tests are unavailable.

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Area of Science:

  • Genetics
  • Neuroscience
  • Molecular Biology

Background:

  • Intellectual disability (ID) affects 2-3% of the population, with heterogeneous genetic and environmental causes.
  • The etiology of ID remains unknown in a significant proportion of affected individuals, particularly those with mild ID.
  • X-linked intellectual disability (XLID) accounts for approximately 12% of all ID cases, highlighting the importance of X chromosome gene analysis.

Purpose of the Study:

  • To investigate the utility of multiplex ligation-dependent probe amplification (MLPA) for copy number analysis of known X-linked intellectual disability (XLID) genes.
  • To identify genetic causes of ID in 100 nonsyndromic patients through targeted gene analysis.
  • To evaluate MLPA as a potential diagnostic tool for intellectual disability.

Main Methods:

  • Copy number analysis of selected XLID genes was performed using multiplex ligation-dependent probe amplification (MLPA) in 100 nonsyndromic patients.
  • Whole-genome SNP microarray analysis (Affymetrix® 6.0) was utilized to confirm identified copy number variations.
  • Genetic analysis focused on identifying duplications within specific genes associated with X-linked intellectual disability.

Main Results:

  • MLPA detected a duplication in all exons of the MECP2 gene in one patient.
  • A duplication in the fifth exon of the TM4SF2/TSPAN7 gene was identified in another patient.
  • Microarray analysis confirmed MECP2 duplication and revealed duplication of exons 2-7 in TM4SF2/TSPAN7, corroborating MLPA findings.

Conclusions:

  • MECP2 duplication is a recognized cause of syndromic X-linked intellectual disability (XLID) in males.
  • Duplications in TM4SF2/TSPAN7 require further investigation to determine their role in XLID.
  • MLPA is an efficient, cost-effective, and clinically useful method for copy number analysis in the diagnostic workup of ID, especially when microarrays are not the primary approach.