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Related Concept Videos

Genetic Variation01:25

Genetic Variation

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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.
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Among all the organelles in an animal cell, only mitochondria have their own independent genomes. Animal mitochondrial DNA is a double-stranded, closed-circular molecule with around 20,000 base pairs. Mitochondrial DNA is unique in that one of its two strands, the heavy, or H, -strand is guanine rich, whereas the complementary strand is cytosine rich and called the light, or L, -strand. Compared to nuclear DNA, mitochondrial DNA has a very low percentage of non-coding regions and is marked by...
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Apart from the measures of central tendency, distribution, outliers, and the changing characteristics of data with time, an important characteristic of any data set is its variation or spread. In some data sets, the data values are concentrated closely near the mean; in others, the data values are more widely spread out from the mean.
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Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
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A population is composed of members of the same species that simultaneously live and interact in the same area. When individuals in a population breed, they pass down their genes to their offspring. Many of these genes are polymorphic, meaning that they occur in multiple variants. Such variations of a gene are referred to as alleles. The collective set of all the alleles within a population is known as the gene pool.
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Variation01:19

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An important characteristic of any set of data is the variation in the data. In some data sets, the data values are concentrated closely near the mean; in other data sets, the data values are more widely spread out from the mean. The most common measure of variation, or spread, is the standard deviation, which is the square root of variance.
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Related Experiment Video

Updated: Feb 15, 2026

Analyzing Beneficial Effects of Nutritional Supplements on Intestinal Epithelial Barrier Functions During Experimental Colitis
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Tryptophan supplementation and serotonin function: genetic variations in behavioural effects.

E L Gibson1

  • 1Department of Psychology,University of Roehampton,London SW15 4JD,UK.

The Proceedings of the Nutrition Society
|January 26, 2018
PubMed
Summary
This summary is machine-generated.

Serotonin precursor l-tryptophan (TRP) effects on behavior vary by genetic factors and sex. Further research is needed to understand these complex interactions for personalized TRP supplementation strategies.

Keywords:
5-HT 5-hydroxytryptamine5-HTTLPR 5-HT transporter-linked promoter regionATD acute tryptophan depletionCNS central nervous systemsCSF cerebrospinal fluidLNAA large neutral amino acidsMAO monoamine oxidaseTDO tryptophan 2TPH TRP hydroxylaseTRP l-tryptophan3-dioxygenase5-HT transporter-linked promoter regionGenetic polymorphismSerotonin and behaviourStressTryptophan supplementation

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Area of Science:

  • Neuroscience
  • Genetics
  • Psychiatry

Background:

  • Serotonin (5-hydroxytryptamine; 5-HT) influences mood, sleep, and appetite, with dysregulation implicated in affective disorders.
  • L-tryptophan (TRP) is a precursor for serotonin synthesis, but its metabolism is complex, involving peripheral pathways and the kynurenine pathway.
  • Individual differences in serotonin-related genotypes may affect behavioral responses to TRP supplementation.

Purpose of the Study:

  • To review the evidence on how serotonin-related genotypes modulate the behavioral effects of l-tryptophan (TRP) supplementation.
  • To explore the moderating role of genetic variations, particularly the 5-HT transporter-linked promoter region (5-HTTLPR) and sex, on TRP's behavioral impact.

Main Methods:

  • Review of existing literature on TRP supplementation, serotonin genotypes (specifically 5-HTTLPR), and behavioral outcomes.
  • Analysis of studies comparing effects of TRP based on 5-HTTLPR alleles (S/S' vs. L/L') and sex.

Main Results:

  • The 5-HTTLPR genotype interacts with sex to influence TRP's effects on mood and stress response.
  • In women, S/S' genotype shows sensitivity to TRP for mood improvement and cortisol reduction under stress; L/L' genotype offers protection.
  • In men, L/L' genotype may increase risk for stress-induced negative affect, with limited data for S/S' genotypes.

Conclusions:

  • Sex and 5-HTTLPR genotype significantly influence behavioral responses to TRP supplementation, particularly under stress.
  • Current understanding is limited, necessitating larger studies to investigate sex-by-genotype-by-stress-by-TRP interactions.
  • More research considering diverse genotypes is required before making definitive recommendations for TRP treatment based on genetics.