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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 1882, Flemming observed lampbrush chromosomes (LBC) in salamander eggs. Later in 1892, Rückert observed LBCs in shark egg cells and coined the term "lampbrush chromosomes" because they looked like brushes used to clean kerosene lamps.
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Chromosomal microarray analysis in developmental delay and intellectual disability with comorbid conditions.

Yanjie Fan1, Yanming Wu1,2, Lili Wang1

  • 1Department of Pediatric Endocrinology/Genetics, Xinhua Hospital affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai Institute for Pediatric Research, 1665 Kongjiang Road, Shanghai, 200092, China.

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Summary

Chromosomal microarray analysis (CMA) yields vary in developmental delay (DD) and intellectual disability (ID) patients. Specific co-occurring conditions like heart defects significantly increase diagnostic yield, aiding clinical decisions.

Keywords:
Chromosomal microarrayComorbid conditionsDevelopmental delayIntellectual disabilityPathogenic copy number variations

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Area of Science:

  • Genetics
  • Clinical Diagnostics
  • Developmental Biology

Background:

  • Developmental delay (DD) and intellectual disability (ID) often present with diverse phenotypes.
  • Chromosomal microarray analysis (CMA) is a primary diagnostic tool for DD/ID.
  • The diagnostic success of CMA varies based on associated comorbid conditions.

Purpose of the Study:

  • To explore genotype-phenotype correlations in DD/ID.
  • To analyze characteristics of pathogenic copy number variations (pCNVs).
  • To compare diagnostic yields across patient subgroups with different comorbidities.

Main Methods:

  • Retrospective review of CMA data from 710 Chinese patients with DD/ID.
  • Identification and characterization of pathogenic copy number variations (pCNVs).
  • Comparison of diagnostic yields in patient subgroups stratified by co-occurring conditions.

Main Results:

  • 28% diagnostic yield (247 pCNVs in 201 patients).
  • Higher yields observed with congenital heart defects (55%), facial dysmorphism (39%), microcephaly (34%), and hypotonia (35%).
  • Yields were not significantly altered by skeletal malformations, brain malformations, or epilepsy; a slight correlation with ID severity was noted.

Conclusions:

  • Diagnostic yields of CMA in DD/ID patients differ based on phenotypic presentation.
  • Comorbid conditions are crucial factors to consider when implementing CMA for DD/ID diagnosis.