Identification of chromosome abnormalities in subtelomeric regions by microarray analysis: A study of 5,380 cases

Lina Shao, Chad A. Shaw, Xin Yan Lu, Trilochan Sahoo, Carlos A. Bacino, Seema R. Lalani, Pawel Stankiewicz, Svetlana A. Yatsenko, Yinfeng Li, Sarah Neill, Amber N. Pursley, A. Craig Chinault, Ankita Patel, Arthur L. Beaudet, James R. Lupski, Sau W. Cheung

Research output: Contribution to journalArticlepeer-review

100 Scopus citations

Abstract

Subtelomeric imbalances are a significant cause of congenital disorders. Screening for these abnormalities has traditionally utilized GTG-banding analysis, fluorescence in situ hybridization (FISH) assays, and multiplex ligation-dependent probe amplification. Microarray-based comparative genomic hybridization (array-CGH) is a relatively new technology that can identify microscopic and submicroscopic chromosomal imbalances. It has been proposed that an array with extended coverage at subtelomeric regions could characterize subtelomeric aberrations more efficiently in a single experiment. The targeted arrays for chromosome microarray analysis (CMA), developed by Baylor College of Medicine, have on average 12 BAC/PAC clones covering 10 Mb of each of the 41 subtelomeric regions. We screened 5,380 consecutive clinical patients using CMA. The most common reasons for referral included developmental delay (DD), and/or mental retardation (MR), dysmorphic features (DF), multiple congenital anomalies (MCA), seizure disorders (SD), and autistic, or other behavioral abnormalities. We found pathogenic rearrangements at subtelomeric regions in 236 patients (4.4%). Among these patients, 103 had a deletion, 58 had a duplication, 44 had an unbalanced translocation, and 31 had a complex rearrangement. The detection rates varied among patients with a normal karyotype analysis (2.98%), with an abnormal karyotype analysis (43.4%), and with an unavailable or no karyotype analysis (3.16%). Six patients out of 278 with a prior normal subtelomere-FISH analysis showed an abnormality including an interstitial deletion, two terminal deletions, two interstitial duplications, and a terminal duplication. In conclusion, genomic imbalances at subtelomeric regions contribute significantly to congenital disorders. Targeted array-CGH with extended coverage (up to 10 Mb) of subtelomeric regions will enhance the detection of subtelomeric imbalances, especially for submicroscopic imbalances.

Original languageEnglish (US)
Pages (from-to)2242-2251
Number of pages10
JournalAmerican Journal of Medical Genetics, Part A
Volume146
Issue number17
DOIs
StatePublished - Sep 1 2008

Keywords

  • Array-CGH
  • Chromosomal abnormality
  • FISH
  • Subtelomere

ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)

Fingerprint Dive into the research topics of 'Identification of chromosome abnormalities in subtelomeric regions by microarray analysis: A study of 5,380 cases'. Together they form a unique fingerprint.

Cite this