A full-coverage, high-resolution human chromosome 22 genomic microarray for clinical and research applications

Buckley, Patrick G., Mantripragada, Kiran Kumar ORCID: https://orcid.org/0000-0003-2070-8105, Benetkiewicz, Magdalena, Tapia-Páez, Isabel, Diaz de Ståhl, Teresita, Rosenquist, Magnus, Ali, Haider, Jarbo, Caroline, de Bustos, Cecilía, Hirvelä, Carina, Sinder Wilén, Birgitta, Fransson, Ingegerd, Thyr, Charlotte, Johnsson, Britt-Inger, Bruder, Carl E.G., Menzel, Uwe, Hergersberg, Martin, Mandahl, Nils, Blennow, Elisabeth, Wedell, Anna, Beare, David M., Collins, John E., Dunham, Ian, Albertson, Donna, Pinkel, Daniel, Bastian, Boris C., Faruqi, A. Fawad, Lasken, Roger S., Ichimura, Koichi, Collins, V. Peter and Dumanski, Jan P. 2002. A full-coverage, high-resolution human chromosome 22 genomic microarray for clinical and research applications. Human Molecular Genetics 11 (25) , pp. 3221-3229. 10.1093/hmg/11.25.3221

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Abstract

We have constructed the first comprehensive microarray representing a human chromosome for analysis of DNA copy number variation. This chromosome 22 array covers 34.7 Mb, representing 1.1% of the genome, with an average resolution of 75 kb. To demonstrate the utility of the array, we have applied it to profile acral melanoma, dermatofibrosarcoma, DiGeorge syndrome and neurofibromatosis 2. We accurately diagnosed homozygous/heterozygous deletions, amplifications/gains, IGLV/IGLC locus instability, and breakpoints of an imbalanced translocation. We further identified the 14-3-3 eta isoform as a candidate tumor suppressor in glioblastoma. Two significant methodological advances in array construction were also developed and validated. These include a strictly sequence defined, repeat-free, and non-redundant strategy for array preparation. This approach allows an increase in array resolution and analysis of any locus; disregarding common repeats, genomic clone availability and sequence redundancy. In addition, we report that the application of phi29 DNA polymerase is advantageous in microarray preparation. A broad spectrum of issues in medical research and diagnostics can be approached using the array. This well annotated and gene-rich autosome contains numerous uncharacterized disease genes. It is therefore crucial to associate these genes to specific 22q-related conditions and this array will be instrumental towards this goal. Furthermore, comprehensive epigenetic profiling of 22q-located genes and high-resolution analysis of replication timing across the entire chromosome can be studied using our array.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Medicine MRC Centre for Neuropsychiatric Genetics and Genomics (CNGG)
Subjects:	R Medicine > R Medicine (General)
Publisher:	Oxford University Press (OUP): Policy B - Oxford Open Option B
ISSN:	0964-6906
Last Modified:	31 Oct 2022 09:54
URI:	https://orca.cardiff.ac.uk/id/eprint/82835

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