Related Experiment Video
Updated: May 23, 2026
07:29
Cell-free Biochemical Fluorometric Enzymatic Assay for High-throughput Measurement of Lipid Peroxidation in High Density Lipoprotein
Published on: October 12, 2017
Are apolipoprotein E alleles correlated with semen quality?
D Paoli1, S Zedda, D Grassetti
1Laboratory of Seminology-Sperm Bank, Department of Experimental Medicine, University of Rome La Sapienza, Rome, Italy.
International Journal of Andrology
|April 12, 2012
Summary
Apolipoprotein E (APOE) gene polymorphism does not appear to influence human semen quality or spermatogenesis. This finding suggests APOE genotype is not a reliable indicator of male reproductive capacity.
Area of Science:
- Human genetics
- Reproductive biology
- Lipoprotein metabolism
Background:
- Apolipoproteins, including apolipoprotein E (APOE), are crucial for regulating lipid transport and metabolism.
- APOE exhibits genetic polymorphism with three common alleles (APOE*2, APOE*3, APOE*4) encoding distinct protein isoforms.
- The evolutionary advantage and population distribution of APOE alleles are debated, with hypotheses including selective advantages related to reproductive periods.
Purpose of the Study:
- To investigate the potential correlation between human APOE gene polymorphism and semen quality.
- To determine if specific APOE genotypes impact spermatogenesis, a key component of male reproductive capacity.
Main Methods:
- Analysis of APOE genotypes in human subjects.
- Assessment of semen parameters to evaluate sperm quality.
- Comparison of semen quality across different APOE genotypes.
Main Results:
- APOE polymorphism was found to be similarly distributed in individuals with normal, impaired, or absent spermatogenesis.
- No statistically significant association was observed between APOE genotypes and semen quality parameters.
- The study did not find evidence linking APOE polymorphism to male fertility or reproductive capacity.
Conclusions:
- Human APOE gene polymorphism is not associated with semen quality.
- APOE genotypes do not demonstrate a demonstrable effect on spermatogenesis.
- Relying solely on the number of children as a measure of male fertility is insufficient; semen quality is a more accurate indicator.
Related Concept Videos
01:22Sperm Structure and Semen Composition
During ejaculation, males release around 2-5 milliliters of semen, which is a complex mixture of mature sperm and various fluids produced by accessory glands. The mature sperm cells measure approximately 60 micrometers in length and consist of a head, neck, midpiece, and tail. The head is flattened and tapered, measuring about 4 to 5 micrometers in length. It contains a nucleus with condensed chromosomes and an acrosome, a cap-like structure filled with enzymes essential for penetrating the...
02:41Lethal Alleles
Agouti: A Lethal Allele
Lucien Cuénot discovered lethal alleles in 1905 while studying the inheritance of coat color in mice. The agouti gene is responsible for the color of the coat in mice. This gene codes for an agouti-signaling protein, which is responsible for melanin distribution in mammals. The wild-type allele gives rise to gray-brown coat color in mice, while the mutant allele gives rise to yellow coat color. In addition to coat color, the agouti gene is associated with the yellow...
Lucien Cuénot discovered lethal alleles in 1905 while studying the inheritance of coat color in mice. The agouti gene is responsible for the color of the coat in mice. This gene codes for an agouti-signaling protein, which is responsible for melanin distribution in mammals. The wild-type allele gives rise to gray-brown coat color in mice, while the mutant allele gives rise to yellow coat color. In addition to coat color, the agouti gene is associated with the yellow...
01:11Pharmacogenetics of Drug Targets: β₂-Adrenergic Receptors, Apo E, Thymidylate Synthase
Genetic polymorphisms in drug targets have emerged as critical determinants of interindividual variability in drug response and toxicity. Pharmacogenomic investigations increasingly focus on identifying these variations to personalize and optimize therapeutic interventions. A drug target may be a receptor, enzyme, or signaling protein involved in pharmacologic responses or disease-related pathways. While early pharmacogenetic studies focused primarily on drug metabolism, current research...
01:25Genetic Variation
Genetic variation is the diversity in DNA sequences found among individuals of the same species. This diversity is crucial for a species' survival because it helps organisms adapt to environmental changes. Genetic variation begins with fertilization, where an egg and sperm cell merge. Each of these cells carries 23 chromosomes, up to 46 in the fertilized egg. Chromosomes are long DNA strands that contain genes, the basic units of heredity.
Genes exist in different versions called alleles, which...
Genes exist in different versions called alleles, which...
01:41Spermatogenesis
Spermatogenesis is the process by which haploid sperm cells are produced in the male testes. It starts with stem cells located close to the outer rim of seminiferous tubules. These spermatogonial stem cells divide asymmetrically to give rise to additional stem cells (meaning that these structures “self-renew”), as well as sperm progenitors, called spermatocytes. Importantly, this method of asymmetric mitotic division maintains a population of spermatogonial stem cells in the male reproductive...
01:09Epistasis Analysis
Although Mendel chose seven unrelated traits in peas to study gene segregation, most traits involve multiple gene interactions that create a spectrum of phenotypes. When the interaction of various genes or alleles at different locations influences a phenotype, this is called epistasis. Epistasis often involves one gene masking or interfering with the expression of another (antagonistic epistasis). Epistasis often occurs when different genes are part of the same biochemical pathway. The...