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PubMed2007

The evolution of infidelity in socially monogamous passerines: neglected components of direct and indirect selection.

A recent study by Goran Arnqvist and Mark Kirkpatrick in the American Naturalist (165:S26-S37) suggested that female polyandry in birds is not driven by females because quantitative genetic approximations of selection demonstrated that indirect selection for female infidelity is weaker than natural selection against it. Instead, it was argued that extrapair copulations are the result of antagonistic selection on male behavior driving female coercion. While the approach and framework of the study were very good, the conclusions of the study were premature because a number of potential adaptive components of polyandry were unaccounted for, and several critical assumptions are unsupported by the current empirical data. Our understanding of extrapair paternity in birds, and perhaps polyandry in general, will be improved by a better empirical understanding of the direct benefits of fertility assurance and postcopulatory cryptic female choice and the relationship between polyandry and male investment. In addition, we need to develop a greater awareness of the limitations of trying to study behavior by proxy in the molecular laboratory. Together, these challenges and the framework recently presented should improve our understanding of the true function of extrapair paternity in birds.

Agonistic Behavior↗
PubMed1999

The relationship between DNA methylation and chromosome imprinting in the coccid Planococcus citri.

The phenomenon of chromosome, or genomic, imprinting indicates the relevance of parental origin in determining functional differences between alleles, homologous chromosomes, or haploid sets. In mealybug males (Homoptera, Coccoidea), the haploid set of paternal origin undergoes heterochromatization at midcleavage and remains so in most of the tissues. This different behavior of the two haploid sets, which depends on their parental origin, represents one of the most striking examples of chromosome imprinting. In mammals, DNA methylation has been postulated as a possible molecular mechanism to differentially imprint DNA sequences during spermatogenesis or oogenesis. In the present article we addressed the role of DNA methylation in the imprinting of whole haploid sets as it occurs in Coccids. We investigated the DNA methylation patterns at both the molecular and chromosomal level in the mealybug Planococcus citri. We found that in both males and females the paternally derived haploid set is hypomethylated with respect to the maternally derived one. Therefore, in males, it is the paternally derived hypomethylated haploid set that is heterochromatized. Our data suggest that the two haploid sets are imprinted by parent-of-origin-specific DNA methylation with no correlation with the known gene-silencing properties of this base modification.

Animals↗
PubMed1996

Metabolic rate and energy balance in very low birth weight infants during kangaroo holding by their mothers and fathers.

The aim of the study was to compare effects of maternal and paternal kangaroo care on oxygen consumption, carbon dioxide production, energy expenditure, skin and rectal temperatures, heart and respiratory rates, arterial saturation, and behavioral states. Eleven preterm infants with gestational age of 28 to 31 weeks, birth weight of 560 to 1390 gm, and postnatal age of 8 to 48 days were studied before, during, and after maternal and paternal kangaroo care. Skin temperature (lower leg) increased significantly during both maternal (36.2 +/- 0.9 degrees vs 36.9 +/- 1.2 degrees C) and paternal (36.3 +/- 0.9 degrees vs 36.8 +/- 0.9 degrees C) kangaroo care. The other parameter changed neither during maternal nor during paternal kangaroo care. We conclude that both maternal and paternal kangaroo care have no adverse effects on energy expenditure.

Body Temperature↗
PubMed2005

APeg3, a novel paternally expressed gene 3 antisense RNA transcript specifically expressed in vasopressinergic magnocellular neurons in the rat supraoptic nucleus.

Vasopressin (VP) and oxytocin (OT) play critical roles in the regulation of salt and water balance, lactation, and various behaviors and are expressed at very high levels in specific magnocellular neurons (MCNs) in the hypothalamo-neurohypophysial system (HNS). In addition to the cell-specific expression of the VP and OT genes in these cells, there are other transcripts that are preferentially expressed in the VP or OT MCNs. One such gene, paternally expressed gene 3 (Peg3), is an imprinted gene expressed exclusively from the paternal allele that encodes a Kruppel-type zinc finger-containing protein involved in maternal behavior and is abundantly expressed in the VP-MCNs. We report here the robust expression in the VP-MCNs of an RNA, which we designate APeg3 that is transcribed in the antisense direction to the 3' untranslated region of the Peg3 gene. The APeg3 mRNA is about 1 kb in size, and the full-length sequence of APeg3, as determined by 5' and 3' RACE, contains an open reading frame that predicts a protein of 93 amino acids and is predominantly expressed in VP-MCNs. Both Peg3 and APeg3 gene expression in the VP-MCNs increase during systemic hyperosmolality in vivo, demonstrating that both of these genes are osmoregulated.

3' Untranslated Regions↗
PubMedDate not supplied

Prader-Willi syndrome and the evolution of human childhood.

The kinship theory of genomic imprinting predicts that imprinted genes have effects on asymmetric kin (relatives with different degrees of matrilineal and patrilineal relatedness). The most important interaction with such a relative is a child's interaction with its mother. Therefore, the study of imprinted genes and their phenotypic effects promises to provide insights into the evolution of mother-child relations. Prader-Willi syndrome (PWS) is caused by the absence of expression of genes at 15q11-q13 that are normally expressed only when paternally derived. The kinship theory predicts that children with PWS will fail to express behaviors that have increased mothers' costs of child-rearing. Our analysis focuses on aspects of the PWS phenotype that affect appetite and feeding. Immediately after birth, children with PWS have little appetite and are usually unable to suckle, but at some stage (usually within the first 2 years) they develop a voracious appetite and an obsession with food. We conjecture that this change in appetite reflects evolutionary forces associated with weaning. Immediately after birth, when a child is completely dependent on the breast, poor appetite reduced maternal costs. However, once a child was able to consume supplemental foods, maternal costs would have been reduced by children with increased, nonfastidious appetites.

Appetite↗
PubMed1995

DNA fingerprinting to determine paternity in laboratory rat sperm competition experiments.

Prior to this study a significant amount of research had been undertaken in the field of sperm competition in mammals. However, males of different strains have been required in each of these studies to enable paternity assignment through gene expression, which has consequently resulted in problems with differential fertilising capacity being encountered. In this study paternity assignment of progeny from sperm competition experiments with Sprague Dawley rats was achieved by multilocus DNA fingerprinting using band locus matching of individual specific banding patterns between progeny and parents. Trials with 4 restriction enzymes and 5 digoxygenin labelled probes (4 oligonucleotide and 1 cloned) achieved the highest levels of DNA fingerprint heterozygosity using AluI(CAC)5 and HinfI(CAC)5 combinations; however, paternity could not be determined in all offspring, due to a higher than expected degree of inbreeding within the rat population used in this study. This was demonstrated in subsequent comparisons of genetic diversity of three laboratory rat breeding populations from two different animal breeding facilities. Data from the rat mating study showed that, under conditions of direct sperm competition, second males given access to a mated oestrus female either 0.5 or 6.0 h after the first mating consistently required less time than the first to ejaculate: 7.6 min vs. 19.5 min (0.5 h delay ); 7.8 min vs. 19.5 min (6.0 h delay). A second males siring advantage was identified using DNA fingerprinting in both delay groups for those offspring on which paternity could be determined: 0.5 h delay, 1st = 39%, 2nd = 61%; 6 h delay, 1st = 34%, 2nd = 66%.

Animals↗
PubMed1980

Psychopathology and fatherlessness in poor boys.

The study reported represents an effort to expand an earlier investigation of how psychopathology is related to fatherlessness. The sample (N=201), composed of U.S. blacks and Cuban refugees of white derivation, was controlled for the family's economic class position, ethnicity, place of residence, and for the children's age, gender, and ordinal position and matched with a control group of ""fathered'' children. Instruments used were a mini MMPI (76 items) and the Louisville Aggression Survey Schedule-1. All of the data obtained in the study were supplied by the mothers--both about themselves and their firstborn male child. No positive association between the boys' psychopathology and their fatherlessness was found. Moreover, the data seemingly indicate that poverty exerts a leveling influence that overrides the differentiating characteristics of ethnic and age grouping, family structure, father presence or absence, and liguistic and cultural heritages.

Adolescent↗
PubMed2006

Health promotion and the freedom of the individual.

This article considers the extent to which health promotion strategies pose a threat to individual freedom. It begins by taking a look at health promotion strategies and at the historical development of health promotion in Britain. A theoretical context is then developed in which Berlin's distinction between negative and positive liberty is used alongside the ideas of John Stuart Mill, Charles Taylor and T.H. Green to discuss the politics of health promotion and to identify the implications of conflicting perspectives on freedom. The final section looks at current health promotion policy in Britain and beyond and argues that, if freedom is seen in terms of empowerment, health promotion can enhance individual freedom.

Choice Behavior↗
PubMed1985

An ethical analysis of double bind conflicts as experienced by care workers feeding severely demented patients.

When patients with incurable dementia diseases no longer take food or fluid voluntarily, the care workers experience distress and anxiety. Thirty-nine care workers were interviewed about their thoughts, feelings and attitudes towards feeding severely demented patients. A phenomenological approach was used and the interviews were developed, attention paid to Bateson's double bind theory, Kohlberg's theory of moral development and ethical theories. Ethical theories, principles and rules, containing messages at different logical levels and the lack of empirical knowledge of the demented patients' inner world, led to the care worker's difficult double bind situations. To solve the conflicts the care workers need insight in all aspects of the problem. In order to understand all the components in a double bind situation it is important to redefine it from outside.

Beneficence↗
PubMed1999

Revisiting the epidemiological standard of preeclampsia: primigravidity or primipaternity?

Pregnancy-induced hypertensive disorders, and especially preeclampsia, are documented to occur primarily in first pregnancies and rarely in subsequent pregnancies. Therefore, the concept of primigravidity is the epidemiological cornerstone of this disease. The authors propose a concept in which preeclampsia is a disease of new couples, especially after a short period of sexual cohabitation, and explore if this alternative primipaternity model, as compared with the primigravidity concept, provides a better fit with well-known epidemiologic descriptions. First, the primipaternity model provides a mathematical modelling which may explain the prevalence of approximately 10% in long-term monogamic populations. Further, it proposes explanations for many epidemiological descriptions which were previously difficult to understand and assemble in a single concept.

Cultural Characteristics↗
PubMed2004

Phenotypic variability in Angelman syndrome: comparison among different deletion classes and between deletion and UPD subjects.

Angelman syndrome (AS) can result from either a 15q11-q13 deletion (del), paternal uniparental disomy (UPD), imprinting, or UBE3A mutations. Here, we describe the phenotypic and behavioral variability detected in 49 patients with different classes of deletions and nine patients with UPD. Diagnosis was made by methylation pattern analysis of exon 1 of the SNRPN-SNURF gene and by microsatellite profiling of loci within and outside the 15q11-q13 region. There were no major phenotypic differences between the two main classes (BP1-BP3; BP2-BP3) of AS deletion patients, except for the absence of vocalization, more prevalent in patients with BP1-BP3 deletions, and for the age of sitting without support, which was lower in patients with BP2-BP3 deletions. Our data suggest that gene deletions (NIPA1, NIPA2, CYF1P1, GCP5) mapped to the region between breakpoints BP1 and BP2 may be involved in the severity of speech impairment, since all BP1-BP3 deletion patients showed complete absence of vocalization, while 38.1% of the BP2-BP3 deletion patients were able to pronounce syllabic sounds, with doubtful meaning. Compared to UPD patients, deletion patients presented a higher incidence of swallowing disorders (73.9% del x 22.2% UPD) and hypotonia (73.3% del x 28.57% UPD). In addition, children with UPD showed better physical growth, fewer or no seizures, a lower incidence of microcephaly, less ataxia and higher cognitive skills. As a consequence of their milder or less typical phenotype, AS may remain undiagnosed, leading to an overall underdiagnosis of the disease.

Adolescent↗
PubMed1996

Multiple paternity in two natural populations (orchard and vineyard) of Drosophila.

Male mating success is an important fitness component in Drosophila. The seminal fluid conveyed with the sperm inhibits the proclivity of the female to remate and reduces her fitness. Nevertheless, females may remate before they have exhausted the sperm from the first male and consequently use sperm from both males. We have studied concurrent multiple paternity (CMP) in two Drosophila melanogaster populations, from an apple orchard and a vineyard just after harvest. CMP is high in both populations, somewhat greater than 50%; but it is not significantly higher in the vineyard, where the population density is much greater than in the orchard. Population density had been thought to be an important determinant of CMP incidence. We have used four gene loci coding for enzymes as independent markers for detecting CMP.

Alcohol Dehydrogenase↗
PubMed1999

ADHD boys in young adulthood: psychosocial adjustment.

OBJECTIVE: To prospectively examine psychosocial functioning in young adulthood in children with attention-deficit/hyperactivity disorder (ADHD). METHOD: This 10-year prospective study compared psychosocial functioning in 18 young adult men in whom ADHD had been diagnosed in childhood and 18 male controls who had never been psychiatrically ill. Subjects' average age was 21 years at follow-up. Interviews assessed subjects' educational, occupational, residential, and marital status; utilization of mental health services; and psychological status. RESULTS: Young adults with ADHD were significantly more likely than controls to be using mental health services, to report psychological problems, and to have fathered children. In addition, a trend indicated that young men with ADHD were more likely to have dropped out of high school but subsequently attained a graduate equivalency diploma. There was also a trend for young adults with ADHD to report a greater history of trouble with the law; however, the groups did not differ on current legal problems. CONCLUSIONS: Overall, these young adults with ADHD appear to have overcome educational and legal difficulties experienced during high school. However, continued problems in psychological functioning appear to persist into young adulthood.

Adult↗