More Like this

1. Frequent Paternal Mitochondrial Inheritance and Rapid Haplotype Frequency Shifts in Copepod Hybrids

   https://doi.org/10.1093/jhered/esab068  

   Lee, Jeeyun; Willett, Christopher S (November 2021, Journal of Heredity)

   Lopez, Jose (Ed.)

   Abstract Mitochondria are assumed to be maternally inherited in most animal species, and this foundational concept has fostered advances in phylogenetics, conservation, and population genetics. Like other animals, mitochondria were thought to be solely maternally inherited in the marine copepod Tigriopus californicus, which has served as a useful model for studying mitonuclear interactions, hybrid breakdown, and environmental tolerance. However, we present PCR, Sanger sequencing, and Illumina Nextera sequencing evidence that extensive paternal mitochondrial DNA (mtDNA) transmission is occurring in inter-population hybrids of T. californicus. PCR on four types of crosses between three populations (total sample size of 376 F1 individuals) with 20% genome-wide mitochondrial divergence showed 2% to 59% of F1 hybrids with both paternal and maternal mtDNA, where low and high paternal leakage values were found in different cross directions of the same population pairs. Sequencing methods further verified nucleotide similarities between F1 mtDNA and paternal mtDNA sequences. Interestingly, the paternal mtDNA in F1s from some crosses inherited haplotypes that were uncommon in the paternal population. Compared to some previous research on paternal leakage, we employed more rigorous methods to rule out contamination and false detection of paternal mtDNA due to non-functional nuclear mitochondrial DNA fragments. Our results raise the potential that other animal systems thought to only inherit maternal mitochondria may also have paternal leakage, which would then affect the interpretation of past and future population genetics or phylogenetic studies that rely on mitochondria as uniparental markers. 

   more » « less
2. Mountain gorillas maintain strong affiliative biases for maternal siblings despite high male reproductive skew and extensive exposure to paternal kin

   https://doi.org/10.7554/eLife.80820  

   Grebe, Nicholas M; Hirwa, Jean Paul; Stoinski, Tara S; Vigilant, Linda; Rosenbaum, Stacy (September 2022, eLife)

   Evolutionary theories predict that sibling relationships will reflect a complex balance of cooperative and competitive dynamics. In most mammals, dispersal and death patterns mean that sibling relationships occur in a relatively narrow window during development and/or only with same-sex individuals. Besides humans, one notable exception is mountain gorillas, in which non-sex-biased dispersal, relatively stable group composition, and the long reproductive tenures of alpha males mean that animals routinely reside with both maternally and paternally related siblings, of the same and opposite sex, throughout their lives. Using nearly 40,000 hr of behavioral data collected over 14 years on 699 sibling and 1235 non-sibling pairs of wild mountain gorillas, we demonstrate that individuals have strong affiliative preferences for full and maternal siblings over paternal siblings or unrelated animals, consistent with an inability to discriminate paternal kin. Intriguingly, however, aggression data imply the opposite. Aggression rates were statistically indistinguishable among all types of dyads except one: in mixed-sex dyads, non-siblings engaged in substantially more aggression than siblings of any type. This pattern suggests mountain gorillas may be capable of distinguishing paternal kin but nonetheless choose not to affiliate with them over non-kin. We observe a preference for maternal kin in a species with a high reproductive skew (i.e. high relatedness certainty), even though low reproductive skew (i.e. low relatedness certainty) is believed to underlie such biases in other non-human primates. Our results call into question reasons for strong maternal kin biases when paternal kin are identifiable, familiar, and similarly likely to be long-term groupmates, and they may also suggest behavioral mismatches at play during a transitional period in mountain gorilla society. 

   more » « less
3. Kinship Practices Among Alternative Family Forms in Western Industrialized Societies

   https://doi.org/10.1111/jomf.12712  

   Furstenberg, Frank F.; Harris, Lauren E.; Pesando, Luca Maria; Reed, Megan N. (August 2020, Journal of Marriage and Family)

   Abstract ObjectiveThis article discusses how kinship is construed and enacted in diverse forms of the family that are now part of the culturally pluralistic family system of Western societies. BackgroundThis study is the second in a pair documenting changes over the past century in the meaning and practice of kinship in the family system of Western societies with industrialized economies. While the first paper reviewed the history of kinship studies, this companion piece shifts the focus to research explorations of kinship in alternative family forms, those that depart from the standard nuclear family structure. MethodThe review was conducted running multiple searches on Google Scholar and Web of Science directly targeting nonstandard family forms, using search terms such as “cohabitation and kinship,” “same‐sex family and kinship,” and “Artificial Reproductive Technology and kinship,” among others. About 70% of studies focused on the United States, while the remaining 30% focused on other industrialized Western societies. ResultsWe identified three general processes by which alternative family forms are created and discussed how kinship practices work in each of them. Thefirstcluster of alternative family forms comes about throughvariations of formal marriage or its absence, including sequential marriages, plural marriages, consensual unions, single parenthood, and same‐sex marriages and partnerships. Thesecondcluster is formed as a result ofalterations in the reproduction process, when a child is not the product of sexual intercourse between two people. Thethirdcluster results from theformation of voluntary bondsthat are deemed to be kinship‐like, in which affiliation rests on neither biological nor legal bases. ConclusionFindings from this study point to a broad cultural acceptance of an inclusive approach to incorporating potential kin in “family relationships.” It is largely left to individuals to decide whether they recognize or experience the diffuse sense of emotional connectedness and perceived obligation that characterize the bond of kinship. Also, family scripts and kinship terms often borrow from the vocabulary and parenting practices observed in the standard family form in the West. Concurrently, the cultural importance of biology remains strong. ImplicationsThis study concludes by identifying important gaps in the kinship literature and laying out a research agenda for the future, including building ademography of kinship. 

   more » « less
4. Examining parent-of-origin effects on transcription and RNA methylation in mediating aggressive behavior in honey bees (Apis mellifera)

   https://doi.org/10.1186/s12864-023-09411-4  

   Bresnahan, Sean_T; Lee, Ellen; Clark, Lindsay; Ma, Rong; Markey, Michael; Rangel, Juliana; Grozinger, Christina_M; Li-Byarlay, Hongmei (June 2023, BMC Genomics)

   Abstract Conflict between genes inherited from the mother (matrigenes) and the father (patrigenes) is predicted to arise during social interactions among offspring if these genes are not evenly distributed among offspring genotypes. This intragenomic conflict drives parent-specific transcription patterns in offspring resulting from parent-specific epigenetic modifications. Previous tests of the kinship theory of intragenomic conflict in honey bees (Apis mellifera) provided evidence in support of theoretical predictions for variation in worker reproduction, which is associated with extreme variation in morphology and behavior. However, more subtle behaviors – such as aggression – have not been extensively studied. Additionally, the canonical epigenetic mark (DNA methylation) associated with parent-specific transcription in plant and mammalian model species does not appear to play the same role as in honey bees, and thus the molecular mechanisms underlying intragenomic conflict in this species is an open area of investigation. Here, we examined the role of intragenomic conflict in shaping aggression in honey bee workers through a reciprocal cross design and Oxford Nanopore direct RNA sequencing. We attempted to probe the underlying regulatory basis of this conflict through analyses of parent-specific RNA m6A and alternative splicing patterns. We report evidence that intragenomic conflict occurs in the context of honey bee aggression, with increased paternal and maternal allele-biased transcription in aggressive compared to non-aggressive bees, and higher paternal allele-biased transcription overall. However, we found no evidence to suggest that RNA m6A or alternative splicing mediate intragenomic conflict in this species. 

   more » « less
5. Transmission of paternal retrieval behavior from fathers to sons in a biparental rodent

   https://doi.org/10.1002/dev.22164  

   Becker, Elizabeth A.; Leithead, Amanda B.; Libo, Natalya; Kumerow, Marie T.; Goetsch, Lauren; Marler, Catherine A. (August 2021, Developmental Psychobiology)

   Abstract Transmission of maternal behavior across generations occurs, but less is known about paternal behavior. In biparental species like the California mouse (Peromyscus californicus), paternal care contributes to the well‐being of offspring with lasting consequences on the brain and behavior. Paternal huddling/grooming behavior can be passed on to future generations, but whether paternal retrieval, which removes young from potential harm, is transmitted independently is unclear. We manipulated paternal retrieval experience through pup displacement manipulations, then examined whether males exposed to higher levels of paternal retrieval in development altered their adult retrieval behavior with their offspring. Males exposed to heightened paternal retrievals, as compared to reduced retrievals, retrieved their offspring more often but huddled/groomed offspring less during undisturbed natural observations. No differences were observed following a pup displacement challenge. The high paternal retrieval group also exhibited more physical activity and stereotypy. Our results are consistent with the hypothesis that paternal retrieval levels are transmitted across generations and may function via mechanisms separate from huddling/grooming. One modifying factor may be anxiety because increased activity and stereotypy occurred in the high retrieval group. We speculate how the transmission of paternal retrievals may inform a protective parenting style. 

   more » « less