Spectrum of Cytogenomic Abnormalities Revealed by Array Comparative Genomic Hybridization on Products of Conception Culture Failure and Normal Karyotype Samples

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• 作者：Qinghua Zhou^a ; ^b ; ^{qinghuazhou@jnu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Shen-Yin Wu^b ; Katherine Amato^b ; Autumn DiAdamo^b ; Peining Li^b ; ^{peining.li@yale.edu" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Products of conception (POC) ; Culture failure ; Normal karyotype ; Array comparative genomic hybridization (aCGH) ; Chromosomal and genomic abnormalities ; Apoptosis
• 刊名：Journal of Genetics and Genomics
• 出版年：2016
• 出版时间：20 March 2016
• 年：2016
• 卷：43
• 期：3
• 页码：121-131
• 全文大小：894 K

文摘

Approximately 30% of pregnancies after implantation end up in spontaneous abortions, and 50% of them are caused by chromosomal abnormalities. However, the spectrum of genomic copy number variants (CNVs) in products of conception (POC) and the underlying gene-dosage-sensitive mechanisms causing spontaneous abortions remain largely unknown. In this study, array comparative genomic hybridization (aCGH) analysis was performed as a salvage procedure for 128 POC culture failure (POC-CF) samples and as a supplemental procedure for 106 POC normal karyotype (POC-NK) samples. Chromosomal abnormalities were detected in 10% of POC-CF and pathogenic CNVs were detected in 3.9% of POC-CF and 5.7% of POC-NK samples. Compiled results from this study and relevant case series through a literature review demonstrated an abnormality detection rate (ADR) of 35% for chromosomal abnormalities in POC-CF samples, 3.7% for pathogenic CNVs in POC-CF samples, and 4.6% for pathogenic CNVs in POC-NK samples. Ingenuity Pathway Analysis (IPA) was performed on the genes from pathogenic CNVs found in POC samples. The denoted primary gene networks suggested that apoptosis and cell proliferation pathways are involved in miscarriage. In summary, a similar spectrum of cytogenomic abnormalities was observed in POC culture success and POC-CF samples. A threshold effect correlating the number of dosage-sensitive genes in a chromosome with the observed frequency of autosomal trisomy is proposed. A rationalized approach using firstly fluorescence in situ hybridization (FISH) testing with probes of chromosomes X/Y/18, 13/21, and 15/16/22 for common aneuploidies and polyploidies and secondly aCGH for other cytogenomic abnormalities is recommended for POC-CF samples.