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Related Concept Videos

Karyotyping01:17

Karyotyping

Describing the number and physical features of chromosomes can reveal abnormalities that underlie genetic diseases. This description is facilitated by special staining techniques that produce a particular banding pattern on each chromosome. State-of-the-art techniques make this approach even more powerful, enabling the detection of individual genes that cause disease.A Simple Chromosome Staining Technique Provides Valuable Scientific InsightSome genetic diseases can be detected by looking at...
Karyotyping01:17

Karyotyping

Describing the number and physical features of chromosomes can reveal abnormalities that underlie genetic diseases. This description is facilitated by special staining techniques that produce a particular banding pattern on each chromosome. State-of-the-art techniques make this approach even more powerful, enabling the detection of individual genes that cause disease.A Simple Chromosome Staining Technique Provides Valuable Scientific InsightSome genetic diseases can be detected by looking at...

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FISH for Pre-implantation Genetic Diagnosis
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Array comparative genomic hybridization analysis in first-trimester spontaneous abortions with 'normal' karyotypes.

Osamu Shimokawa1, Naoki Harada, Noriko Miyake

  • 1Department of Human Genetics, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan.

American Journal of Medical Genetics. Part A
|August 15, 2006
PubMed
Summary

Array comparative genomic hybridization identified a submicroscopic deletion in 5% of G-banding normal spontaneous abortions. This finding highlights the utility of array CGH in detecting submicroscopic chromosomal imbalances in early pregnancy loss.

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Area of Science:

  • Genetics
  • Reproductive Biology
  • Genomic Medicine

Background:

  • First-trimester spontaneous abortions are common, with chromosomal abnormalities being a major cause.
  • G-banding karyotyping is a standard method for detecting chromosomal abnormalities but has limitations in detecting submicroscopic imbalances.
  • Array comparative genomic hybridization (array CGH) offers higher resolution for detecting smaller deletions and duplications.

Purpose of the Study:

  • To investigate the presence of submicroscopic chromosomal imbalances in first-trimester spontaneous abortions with normal G-banding karyotypes.
  • To determine the frequency of submicroscopic deletions in chromosomally normal early pregnancy losses.
  • To evaluate the utility of array CGH in identifying the genetic causes of miscarriage.

Main Methods:

  • Array comparative genomic hybridization (array CGH) analysis was performed on chorionic villous samples from 20 first-trimester spontaneous abortions.
  • A custom microarray with 2,173 BAC clones providing whole-genome coverage at 1.5-Mb resolution was utilized.
  • G-banding karyotyping was used as a preliminary screening method.

Main Results:

  • Two deletions were initially identified: a 1.4-Mb deletion at 3p26.2-p26.3 and a 13.7-Mb deletion at 13q32.3-qter.
  • Further analysis revealed the 13.7-Mb deletion was likely due to decidual cell contamination, leaving the 1.4-Mb deletion as the sole confirmed submicroscopic imbalance.
  • This submicroscopic deletion was detected in 1 out of 19 (5%) cases with normal G-banding chromosomes.

Conclusions:

  • Array CGH detected a significant submicroscopic deletion (1.4-Mb at 3p26.2-p26.3) in 5% of first-trimester spontaneous abortions with normal G-banding karyotypes.
  • This suggests that submicroscopic chromosomal imbalances, undetectable by conventional karyotyping, contribute to early pregnancy loss.
  • Array CGH is a valuable tool for identifying genetic causes of miscarriage, improving diagnostic yield in cases with normal G-banding results.