X Chromosome Loss Tied to Infertility - Summary - MDSpire

X Chromosome Loss Tied to Infertility

Women with higher LOX levels had more than double the odds of failing to conceive naturally.

  • By

  • Mouj Hijazi

  • May 15, 2026

  • 4 min

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Objective:

To evaluate the association between hematopoietic loss of the X chromosome (LOX) and natural conception in women, specifically focusing on its implications for reproductive aging.

Key Findings:
  • Higher LOX levels were found in infertile women compared to controls, significant after adjusting for age, BMI, and prior pregnancy.
  • A LOX threshold of 0.87% indicated more than twofold odds of not achieving natural conception, highlighting its potential as a predictive marker.
  • The association was strongest in women aged 35 to 39 years.
  • LOX was not associated with outcomes of assisted reproductive technology, indicating its specificity to natural conception.
  • LOX did not correlate with serum AMH or FSH levels, suggesting it reflects a distinct biological dimension.
Interpretation:

LOX may reflect a biological dimension of reproductive aging distinct from traditional ovarian reserve markers, potentially indicating systemic genomic instability or immune dysregulation, warranting further exploration.

Limitations:
  • Case-control design limits causality inference.
  • Study relied on peripheral blood rather than reproductive tissue.
  • Participants were exclusively Asian, limiting generalizability.
  • Most controls were sampled during pregnancy, which may affect leukocyte dynamics.
  • The infertility cohort included heterogeneous causes of reduced fertility.
Conclusion:

Hematopoietic LOX may provide complementary information to conventional ovarian reserve markers, warranting further prospective studies to evaluate its role in fertility risk stratification among younger women.

Original Source(s)

X Chromosome Loss Tied to Infertility

  • by Mouj Hijazi

  • May 15, 2026

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