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Related Experiment Videos

Suicidal behavior in twins: a replication.

A Roy1, N L Segal

  • 1Psychiatry Service, Department of Veterans Affairs, VA Healthcare System, East Orange, NJ 07018, USA.

Journal of Affective Disorders
|September 5, 2001
PubMed
Summary
This summary is machine-generated.

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This study confirms that identical twins (monozygotic, MZ) show higher concordance for suicidal behavior than fraternal twins (dizygotic, DZ). These findings suggest a significant genetic influence on suicidal behavior.

Area of Science:

  • Psychiatry
  • Behavioral Genetics
  • Twin Studies

Background:

  • Previous research indicated higher concordance for suicidal behavior in monozygotic (MZ) twins compared to dizygotic (DZ) twins.
  • Replication of these findings is crucial for understanding the genetic underpinnings of suicidal behavior.

Purpose of the Study:

  • To replicate the finding of greater concordance for suicidal behavior in MZ co-twins compared to DZ co-twins.
  • To further investigate the role of genetic factors in suicidal behavior.

Main Methods:

  • A new series of 28 twin pairs was collected, where one twin had committed suicide.
  • Concordance rates for suicidal behavior were compared between MZ and DZ twin pairs.

Main Results:

Related Experiment Videos

  • Four out of 13 MZ twin pairs were concordant for suicidal behavior.
  • Zero out of 15 DZ twin pairs were concordant for suicidal behavior.
  • The difference in concordance rates between MZ and DZ twins was statistically significant (P=0.035).

Conclusions:

  • The data replicate previous findings of higher concordance for suicidal behavior in MZ co-twins compared to DZ co-twins.
  • These results support the hypothesis of a genetic influence on suicidal behavior.
  • Further research into the genetic etiology of suicidal behavior is warranted.