title: Refining quantitative fluorescent polymerase chain reaction for prenatal detection of X chromosomal anomalies in the major Southeast Asian populations.
abstract: BACKGROUND
  This study aimed to refine the current quantitative fluorescent polymerase chain reaction (QF-PCR) screen to detect X chromosome anomalies for prenatal diagnosis in the major Southeast-Asian populations.
  
  
  METHODS
  100 amniotic fluid samples from Chinese, Malay and Indian origins were subjected to QF-PCR using the X chromosome markers, HPRT, X22 and AMXY, along with the autosomal marker D21S1411.
  
  
  RESULTS
  Out of the 100 samples tested by markers X22 and HPRT, eight samples were homozygous for both markers, of which seven were resolved by comparison with the autosomal marker D21S1411.
  
  
  CONCLUSIONS
  99 percent of samples could be tested for X chromosome copy numbers, increasing the stringency for detection of X chromosome anomalies by QF-PCR. All results were confirmed by cytogenetics.
authors.affiliation: Department of Obstetrics and Gynaecology, Yong Loo Lin School of Medicine, National University of Singapore, and Department of Laboratory Medicine, National University Hospital Service Block, 5 Lower Kent Ridge Road, Singapore 119074. leenagole@gmail.com
authors.forename: L
authors.initials: L
authors.lastname: Gole
authors.forename: F
authors.initials: F
authors.lastname: Adrianne
authors.forename: A M
authors.initials: AM
authors.lastname: Ee
authors.forename: B L
authors.initials: BL
authors.lastname: Ng
authors.forename: S
authors.initials: S
authors.lastname: Baig
authors.forename: E
authors.initials: E
authors.lastname: Koay
authors.forename: A
authors.initials: A
authors.lastname: Biswas
authors.forename: M
authors.initials: M
authors.lastname: Choolani
mesh_terms: D002869:Chromosome Aberrations; D041321:Chromosomes, Human, X / Q000235:genetics*; D005260:Female; D006801:Humans; D018895:Microsatellite Repeats; D016133:Polymerase Chain Reaction / Q000379:methods*; D011247:Pregnancy; D011296:Prenatal Diagnosis