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Related Experiment Videos

Sperm abnormalities in retinitis pigmentosa

W E Connor1, R G Weleber, C DeFrancesco

  • 1Department of Medicine, Oregon Health Sciences University, Portland 97201-3098, USA.

Investigative Ophthalmology & Visual Science
|December 31, 1997
PubMed
Summary

Patients with retinitis pigmentosa show abnormal sperm fatty acid composition, particularly reduced docosahexaenoic acid (DHA). This lipid abnormality correlates with reduced sperm function and may indicate similar retinal issues in retinitis pigmentosa.

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Area of Science:

  • Biochemistry
  • Ophthalmology
  • Reproductive Biology

Background:

  • Retinitis pigmentosa (RP) is an inherited retinal disease causing progressive vision loss.
  • Sperm and retinal cells share structural and biochemical similarities, including high docosahexaenoic acid (DHA) content.
  • Reduced DHA levels in RP patients' blood suggest potential retinal DHA deficiency contributing to visual impairment.

Purpose of the Study:

  • To investigate the fatty acid composition of erythrocytes and sperm in RP patients.
  • To assess sperm functional characteristics in RP patients.
  • To explore the hypothesis that sperm abnormalities in RP may reflect similar lipid and structural retinal abnormalities.

Main Methods:

  • Analysis of lipid composition (fatty acids, sterols) in erythrocytes and sperm.

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  • Evaluation of sperm function (motility, structure, count).
  • Comparison between 26 RP patients and 8 healthy controls.

    • Main Results:

    • RP patients exhibited significantly lower sperm DHA concentrations, a reduced desmosterol-to-cholesterol ratio, decreased motility, abnormal sperm structure, and lower sperm counts.
    • Usher's II syndrome patients showed the most significant DHA reduction in sperm.
    • Sperm DHA levels positively correlated with motility, sperm count, and the desmosterol-to-cholesterol ratio. Lower erythrocyte DHA was also noted in RP patients.

    Conclusions:

    • Sperm in RP patients, especially those with Usher's II, display abnormal lipid profiles linked to impaired motility.
    • These findings suggest potential parallels in retinal DHA biochemistry in RP patients.
    • Sperm analysis may serve as a potential biomarker for retinitis pigmentosa, warranting further investigation with clinical trials of DHA supplementation.