title: Cytogenetic analysis of chromosomal abnormalities in Sri Lankan children.
abstract: BACKGROUND
  Cytogenetic analysis is a valuable investigation in the diagnostic work up of children with suspected chromosomal disorders. The objective of this study was to describe the prevalence of various types of chromosomal abnormalities in Sri Lankan children undergoing cytogenetic analysis.
  
  
  METHODS
  Cytogenetic reports of 1554 consecutive children with suspected chromosomal disorders who underwent karyotyping in two genetic centers in Sri Lanka from January 2006 to December 2011 were reviewed retrospectively.
  
  
  RESULTS
  A total of 1548 children were successfully karyotyped. Abnormal karyotypes were found in 783 (50.6%) children. Numerical and structural abnormalities accounted for 90.8% and 9.2%, respectively. Down syndrome was the commonest aneuploidy identified. Other various autosomal and sex chromosomal aneuploidies as well as micro-deletion syndromes were also detected.
  
  
  CONCLUSIONS
  The prevalence of chromosomal abnormalities in Sri Lankan children undergoing cytogenetic analysis for suspected chromosomal disorders was relatively higher than that in Caucasian and other Asian populations.
authors.affiliation: , Colombo, Sri Lanka.|Human Genetics Unit, Faculty of Medicine, University of Colombo, Colombo, Sri Lanka.
authors.forename: Sharmila
authors.initials: S
authors.lastname: Thillainathan
authors.affiliation: , Colombo, Sri Lanka.|Human Genetics Unit, Faculty of Medicine, University of Colombo, Colombo, Sri Lanka.
authors.forename: Nirmala D
authors.initials: ND
authors.lastname: Sirisena
authors.affiliation: , Colombo, Sri Lanka.|Asiri Center for Genomic and Regenerative Medicine, Asiri Surgical Hospital, Colombo, Sri Lanka.
authors.forename: Kariyawasam W J C
authors.initials: KW
authors.lastname: Kariyawasam
authors.affiliation: , Colombo, Sri Lanka.|Human Genetics Unit, Faculty of Medicine, University of Colombo, Colombo, Sri Lanka.
authors.forename: Rohan W
authors.initials: RW
authors.lastname: Jayasekara
authors.affiliation: , Colombo, Sri Lanka. vajirahwd@hotmail.com.|Human Genetics Unit, Faculty of Medicine, University of Colombo, Colombo, Sri Lanka. vajirahwd@hotmail.com.|Asiri Center for Genomic and Regenerative Medicine, Asiri Surgical Hospital, Colombo, Sri Lanka. vajirahwd@hotmail.com.
authors.forename: Vajira H W
authors.initials: VH
authors.lastname: Dissanayake
mesh_terms: D002648:Child; D002675:Child, Preschool; D002869:Chromosome Aberrations / Q000706:statistics & numerical data*; D020732:Cytogenetic Analysis; D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D007621:Karyotyping; D008297:Male; D015995:Prevalence; D012189:Retrospective Studies; D013188:Sri Lanka / Q000453:epidemiology
keywords: aneuploidy; chromosome aberrations; cytogenetic analysis; karyotypes