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Somatic Genomic Variations in Extra-Embryonic Tissues

Journal Article · · Current Genomics
 [1];  [2];  [3]
  1. Univ. of California, San Francisco, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Life Sciences Division. Dept. of Cancer and DNA Damage Responses; DOE/OSTI
  2. Univ. of California, San Francisco, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Life Sciences Division. Dept. of Cancer and DNA Damage Responses
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Life Sciences Division. Dept. of Cancer and DNA Damage Responses
In the mature chorion, one of the membranes that exist during pregnancy between the developing fetus and mother, human placental cells form highly specialized tissues composed of mesenchyme and floating or anchoring villi. Using fluorescence in situ hybridization, we found that human invasive cytotrophoblasts isolated from anchoring villi or the uterine wall had gained individual chromosomes; however, chromosome losses were detected infrequently. With chromosomes gained in what appeared to be a chromosome-specific manner, more than half of the invasive cytotrophoblasts in normal pregnancies were found to be hyperdiploid. Interestingly, the rates of hyperdiploid cells depended not only on gestational age, but were strongly associated with the extraembryonic compartment at the fetal-maternal interface from which they were isolated. Since hyperdiploid cells showed drastically reduced DNA replication as measured by bromodeoxyuridine incorporation, we conclude that aneuploidy is a part of the normal process of placentation potentially limiting the proliferative capabilities of invasive cytotrophoblasts. Thus, under the special circumstances of human reproduction, somatic genomic variations may exert a beneficial, anti-neoplastic effect on the organism.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER). Biological Systems Science Division
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1628005
Journal Information:
Current Genomics, Journal Name: Current Genomics Journal Issue: 6 Vol. 11; ISSN 1389-2029
Publisher:
Bentham Science PublishersCopyright Statement
Country of Publication:
United States
Language:
English

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Bioinformatics Tools Allow Targeted Selection of Chromosome Enumeration Probes and Aneuploidy Detection journal November 2012
Single Cell Genomics of the Brain: Focus on Neuronal Diversity and Neuropsychiatric Diseases journal August 2012
Bioinformatic Tools Identify Chromosome-Specific DNA Probes and Facilitate Risk Assessment by Detecting Aneusomies in Extra-embryonic Tissues journal August 2012
The dysfunctional placenta epigenome: causes and consequences journal October 2012