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PubMed1984

Comparative genetical analysis: a new tool for validating the schizophrenia subtypes.

350 carefully selected schizophrenic probands and their parents and siblings were diagnosed according to three different clinical classifications, and a multiple-threshold analysis was carried out within the framework of the multifactoral model of inheritance. The results suggest that of the three classification systems, Leonhard's and Sneshnevsky's nosological system delineates relatively homogeneous subtypes from the clinical and genetic point of view, pointing to the promise these nosological systems have for the planning of future research in psychiatric genetics.

Genetics, Behavioral↗
PubMed1986

Lordotic behavior in male rats: genetic and hormonal regulation of sexual differentiation.

The male offspring of Long-Evans rats treated with the aromatization inhibitor ATD (1,4,6-androstatriene-3,17-dione) during pregnancy show high levels of lordotic behavior when treated with estrogen and progesterone in adulthood. The male offspring of Sprague-Dawley dams treated in the same way show only a slight facilitation of lordotic potential. These strain differences could reflect strain differences in gestation length and therefore differences in the timing of the sensitive period of sexual differentiation; they could reflect differences in the sensitivity to the defeminizing actions of gonadal hormones; or they could reflect differences in the sensitivity to ATD treatment. We therefore directly compared the effects of prenatal and early postnatal treatment with ATD on the potential of male Long-Evans and Sprague-Dawley rats to show lordosis when given estrogen and progesterone in adulthood. In both strains ATD treatment facilitated adult lordotic behavior. Treatment appeared to have a greater effect in the Long-Evans strain. However, control Long-Evans males were substantially more responsive to hormone treatment in adulthood than were Sprague-Dawley males. In the Long-Evans strain short-term ATD treatment (Days 20-23 of pregnancy) was as effective as long-term treatment (Days 10-23). In the Sprague-Dawley strain, ATD treatment was most effective when given prenatally and postnatally. Strain differences in hormonal sensitivity best account for the present findings.

Androstatrienes↗
PubMed2005

Prevalence and genetic architecture of Child Behavior Checklist-juvenile bipolar disorder.

BACKGROUND: No consensus has been reached yet on how best to characterize children with juvenile bipolar disorder (JBD). Several groups have shown that children on the attention problems (AP), aggressive behavior (AGG), and anxious-depressed (AD) syndromes of the Child Behavior Checklist (CBCL) are likely to meet criteria for DSM-JBD. We aimed to use a large population-based twin sample to evaluate the prevalence and genetic architecture of the CBCL-JBD (deviant on AP, AGG, and AD) phenotype and compare these data to children who are deviant on just the CBCL-AP syndrome. METHODS: Structural equation modeling (SEM) was applied to CBCL data from 5418, 3562, and 1971 Dutch twin pairs at ages 7, 10, and 12 years. RESULTS: The CBCL-JBD phenotype occurs in approximately 1% of children at each age. Among the children who meet criteria for the CBCL-AP phenotype ( approximately 5%), between 13 and 20% also meet criteria for CBCL-JBD. The best SEM for CBCL-JBD includes additive genetic, shared and unique environmental factors. The best SEM for CBCL-AP includes dominant and additive genetic and unique environmental factors. CONCLUSIONS: These data suggest that CBCL-JBD is common, and even more common among children who have severe attention problems. CBCL-JBD shows familial aggregation due to both genetic and shared environmental factors.

Adolescent↗
PubMed1991

Genetic determinants of individual differences in avoidance learning: behavioral and endocrine characteristics.

Bidirectional genetic selection for good and poor active avoidance learning in a shuttle box has been carried out in three independent laboratories using remarkably similar discrete-trial training procedures. The resulting strains are known as the Roman High and Low Avoidance (RHA and RLA), the Syracuse High and Low Avoidance (SHA and SLA) and the Australian High and Low Avoidance (AHA and ALA) strains, respectively. An additional unidirectionally selected strain, known as the Tokai High Avoider (THA) strain was developed in Japan using a free-operant Sidman avoidance procedure in a Skinner box. This paper reviews the selection of the Syracuse strains, enumerates the various behavioral and endocrine characteristics of the strains, and compares them to the other similarly selected strains. The behavioral work suggests that genetic selection from diverse breeding stocks has resulted in common characteristics that differentiate the strains in the emotional, not learning, domain. The endocrine data, however, are somewhat at odds. The Syracuse strains differentiate one way with respect to endocrine function, and the Roman strains differentiate in the opposite way. We suggest, therefore, that the endocrine correlates are not tightly linked to the avoidance genotype. Genetic analysis of all of the selected strains for both the avoidance phenotype and the endocrine correlates will be needed to test this hypothesis.

Animals↗
PubMed2003

[Genetic analysis for developmental behavior of honeybee colony's royal jelly production traits in western honeybees].

Analyses of genotypic effects for colony's royal jelly (RJ) yields and RJ in each queen cell as well as acceptances of queen cell cups of three lines of Western honeybees (Apis melliffera Lingistica) were conducted by using a genotypic model for analyzing the genetic and non-genetic effects. Analytis approaches of conventional and conditional variance and correlation were employed to evaluate the developmental behavior of honeybee colony's RJ producing ability. The results indicated that significant variance due to genotypic effect was detected for colony's RJ yields and RJ in each queen cell cup at all stages, while the acceptance of queen cell cups was found variance significantly at 10 stages of its total 11. It meant that the three traits were dominated by genotypic effect. Significant conditional variances were found at some stages when no unconditional one being detected. Correlation analysis between same trait at different stages indicated that the significant coefficients always existed due to genotypic effects for RJ yields and RJ in each queen cell cup. Although the significant coefficients of the acceptance of queen cell cup at different stages were found at most of the stages, the coefficients were not found in come of the stages. These results indicated that the genotypic effects dominated in early stages of colony's RJ yield and RJ in each queen cell cup influencing its late stages in the same way, but the acceptance of queen cells cup was not. The analysis of correlation between different pair of traits showed that the coefficients between colony's RJ yields and RJ in each queen cell cup were significant at all stages, and while the coefficients between colony's RJ yields and the acceptance of queen cell cups were not always significant at all stages. It was because the genotypic effects dominated the former pair of traits had harmonious effects, while the later pair of traits were not.

Analysis of Variance↗
PubMed1975

General kin selection models for genetic evolution of sib altruism in diploid and haplodiploid species.

A population genetic approach is presented for general analysis and comparison of kin selection models of sib and half-sib altruism. Nine models are described, each assuming a particular mode of inheritance, number of female inseminations, and Mendelian dominance of the altruist gene. In each model, the selective effects of altruism are described in terms of two general fitness functions, A(beta) and S(beta), giving respectively the expected fitness of an altruist and a nonaltruist as a function of the fraction of altruists beta in a given sibship. For each model, exact conditions are reported for stability at altruist and nonaltruist fixation. Under the Table 3 axions, the stability conditions may then be partially ordered on the basis of implications holding between pairs of conditions. The partial orderings are compared with predictions of the kin selection theory of Hamilton.

Biological Evolution↗
PubMed2001

Better never than late: peer review and the preservation of prejudice.

This article documents some difficulties authors face who challenge faulty research claims published in mainstream literature. Editors of "reputable journals" may react with stonewalling tactics that tend to enshrine these faulty results. A case in point is the mental test literature, which has long been beset with racist myths. In 1985, Arthur Jensen added a new myth, his "Spearman Hypothesis," which asserts that a positive correlation between White/Black means differences in scores on mental tests and the loadings of the first principal component confirms the existence of a general intelligence factor ("g"). It can be shown by mathematical and geometric deduction, by computer stimulation, and by reference to "real data," including Jensen's own, that the assertion is unwarranted, and that the relationship Jensen observed is an artifact that has nothing to do with ethnicity or "g." Nevertheless, it proved impossible for more than 12 years to record this challenge to Jensen's claims in any of the leading journals in psychology and statistics. Typically, their editors invoked arguments having nothing to do with the fundamental question of whether Jensen's claims are true or false. It is concluded that, in view of the transparent racist implications of these claims, such editorial policies--regardless of their motivations--contribute to the preservation of ethnic stereotypes and prejudice.

Black or African American↗