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This study investigated genetic causes of early pregnancy loss, finding aneuploidies, triploidies, and pathogenic variants in over half of cases. Most genetic causes originated on maternal chromosomes, highlighting sequence diversity in pregnancy loss.

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Area of Science:

  • Genetics
  • Reproductive Biology
  • Genomic Medicine

Background:

  • Germline mutations are heritable and occur before fertilization.
  • De novo mutations (DNMs) are well-studied, with most originating paternally.
  • Early pregnancy loss is understudied, with few known causes or interventions.

Purpose of the Study:

  • To understand the sequence diversity and genetic causes of early pregnancy loss.
  • To investigate the interplay between meiotic recombination and point mutations in pregnancy loss.
  • To analyze trios (mother, father, fetus) from clinically diagnosed pregnancy loss cases.

Main Methods:

  • Whole-genome sequencing (WGS) of 664 early pregnancy loss cases (1439 fetal samples, 467 trios).
  • Assessment of aneuploidies, de novo copy number variants (CNVs), and single-site variants (SSVs).
  • Analysis of mutation origins (paternal vs. maternal) and recombination failure.

Main Results:

  • Aneuploidies detected in 206 cases (most common: monosomy X, trisomy 16).
  • 19 large de novo CNVs identified in 14 cases.
  • Pathogenic or likely pathogenic SSVs found in 26 genotypes, with higher frequency in early pregnancy loss compared to controls.
  • Probable genetic causes identified in 254 of 467 cases.
  • Most genetic causes originated on maternal chromosomes.
  • Triploid fetuses had significantly more DNMs than euploid fetuses.
  • High paternal contribution to DNMs confirmed, with specific patterns in triploidies.

Conclusions:

  • Significant sequence diversity contributes to early pregnancy loss.
  • Genetic factors, including aneuploidies, triploidies, pathogenic SSVs, and de novo CNVs, explain a substantial portion of early pregnancy loss.
  • Most identified genetic causes originate on maternal chromosomes.
  • Further research is needed for non-genetic causes and potential interventions.