5HTTLPR Polymorphism and Enlargement of the Pulvinar: Unlocking the Backdoor to the Limbic System

Keith A. Young, Leigh A. Holcomb, Willy L. Bonkale, Paul B. Hicks, Umar Yazdani, Dwight C. German

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

Background: The 5HTTLPR genetic variant of the serotonin transporter (SERT), which consists of a long (SERT-l) and short (SERT-s) allele, has emerged as a major factor influencing emotional behavior and brain anatomy. The pulvinar nucleus of the thalamus projects to important limbic nuclei including the amygdala and cingulate cortex, is involved in the processing of stimuli with emotional content, and contains an abundance of SERT. Methods: Stereological methods were used to measure pulvinar neuron number in postmortem tissue from major depressive disorder (n = 11), bipolar disorder (n = 11), schizophrenia (n = 12), and control (n = 15) specimens from the Stanley Foundation Neuropathology Consortium. The effect of SERT genotype on pulvinar volume and neuron number was investigated by using analysis of covariance. Results: Analysis of covariance with diagnosis, SERT genotype, age, hemisphere, postmortem interval, and time-in-formalin covariates identified a 20% increase in pulvinar neuron number and volume in SERT-ss subjects. Conclusions: The elevated number of pulvinar neurons in subjects with a SERT-ss genotype may serve to enhance subcortical input of emotionally relevant stimuli to the limbic system, providing a mechanism for the 5HTTLPR genetic variant to affect predisposition to conditions such as major depression.

Original languageEnglish (US)
Pages (from-to)813-818
Number of pages6
JournalBiological Psychiatry
Volume61
Issue number6
DOIs
StatePublished - Mar 15 2007

Fingerprint

Pulvinar
Limbic System
Serotonin Plasma Membrane Transport Proteins
Neurons
Genotype
Gyrus Cinguli
Major Depressive Disorder
Amygdala
Bipolar Disorder
Formaldehyde
Anatomy
Schizophrenia
Alleles
Depression
Brain

Keywords

  • Depression
  • human
  • postmortem
  • pulvinar
  • serotonin
  • thalamus

ASJC Scopus subject areas

  • Biological Psychiatry

Cite this

5HTTLPR Polymorphism and Enlargement of the Pulvinar : Unlocking the Backdoor to the Limbic System. / Young, Keith A.; Holcomb, Leigh A.; Bonkale, Willy L.; Hicks, Paul B.; Yazdani, Umar; German, Dwight C.

In: Biological Psychiatry, Vol. 61, No. 6, 15.03.2007, p. 813-818.

Research output: Contribution to journalArticle

Young, Keith A. ; Holcomb, Leigh A. ; Bonkale, Willy L. ; Hicks, Paul B. ; Yazdani, Umar ; German, Dwight C. / 5HTTLPR Polymorphism and Enlargement of the Pulvinar : Unlocking the Backdoor to the Limbic System. In: Biological Psychiatry. 2007 ; Vol. 61, No. 6. pp. 813-818.
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