The 5-HTTLPR is a polymorphism in the promoter region of the serotonin transporter encoding gene, whose two different variants (short and long) have differential effects on the way the serotonin transporter carries out its task, with the short (S) version transporting significantly less serotonin back to the …
What does 5-HTTLPR stand for?
serotonin-transporter-linked promoter region
5-HTTLPR (serotonin-transporter-linked promoter region) is a degenerate repeat polymorphic region in SLC6A4, the gene that codes for the serotonin transporter. Since the polymorphism was identified in the middle of the 1990s, it has been extensively investigated, e.g., in connection with neuropsychiatric disorders.
What has been found for individuals who inherit two short alleles of the 5-HTTLPR gene?
All humans inherit a copy of this gene variant from each parent. Study participants with two short 5-HTTLPR alleles were found to be most unhappy in their marriages when there was a lot of negative emotion, such as anger and contempt, and most happy when there was positive emotion, such as humor and affection.
What is rs25531?
The Serotonin Transporter Polymorphism rs25531 Is Associated with Irritable Bowel Syndrome.
What gene is responsible for serotonin?
The gene that encodes the serotonin transporter is called solute carrier family 6 (neurotransmitter transporter, serotonin), member 4 (SLC6A4, see Solute carrier family). In humans the gene is found on chromosome 17 on location 17q11.
What is the 5-HTT gene psychology?
The 5-HTT gene is responsible for regulating the chemical serotonin, which helps transmit messages in the brain. The people who showed a greater fear response during an experiment had a variation in the gene. This variation is linked to increasing the regulation of serotonin levels in the brain.
What do serotonin transporters do?
Serotonin transporters (SERTs) are largely recognized for one aspect of their function—to transport serotonin back into the presynaptic terminal after its release. Another aspect of their function, however, may be to generate currents large enough to have physiological consequences.
How do you know if you have low serotonin levels?
Some common signs of serotonin deficiency include:
- Depression. Research increasingly points to a complex relationship between depression and serotonin.
- Changes in sleep.
- Chronic pain.
- Memory or learning issues.
- Anxiety.
- Schizophrenia.
- Problems with the body’s internal clock.
- Appetite issues.
What genetic disorders affect serotonin?
Genetic variability affecting serotonin levels The serotonin transporter polymorphism (5HTTLPR) and the monoamine oxidase A polymorphism (MAOA-LPR) have been implicated in conditions and behaviours such as depression, anxiety, aggression, alcoholism, autism, suicidality, and impulsiveness (9–15).
What does low serotonin feel like?
People who feel unusually irritable or down for no apparent reason may have low serotonin levels. Depression: Feelings of sadness, hopelessness, and anger, as well as chronic fatigue and thoughts of suicide, may indicate depression. Anxiety: Low serotonin levels may cause anxiety.
What are the alleles associated with the 5-HTTLPR?
The initial genetic association studies involving the 5-HTTLPR considered just two alleles: the short and the long. The short allele was associated with reduced transcriptional efficiency of the 5-HTT gene, and lower expression of 5-HTT.
What is a 5httlpr polymorphism?
5-HTTLPR is a common polymorphism that includes a variable number of tandem repeats (44-basepair insertion/deletion) in the promoter region. The HTR2A gene, which encodes the serotonin 2A receptor, is downregulated by selective serotonin reuptake inhibitors (SSRIs).
Where is the 5-HTT gene located on the chromosome?
The 5-HTT gene is located on chromosome 17q11.1–q12 at the SLC6A4 locus. 59 A functional 5-HTT linked polymorphic region (5-HTTLPR) at the 5′ end alters 5-HTT transcription 60 and has been examined in humans to help define a hereditary basis for the development of alcohol dependence.
Are there other regulatory regions within the 5-HTTLPR?
Along with the 5-HTTLPR, there are other proposed transcriptional regulatory regions within the 5-HTT. One example is a VNTR within intron 2 that has been shown to have differential enhancer activities in the mouse embryo and in human embryonic stem (ES) cells ( Figure 1a ).
