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PubMed2004

Use of biomedical services and traditional healing options among American Indians: sociodemographic correlates, spirituality, and ethnic identity.

OBJECTIVE: The objective of this study was to describe the use of biomedical services and traditional healing options among a reservation-based sample of American Indians from 2 culturally distinct tribes METHODS: Participants were 2595 American Indian adolescents and adults ages 15 to 57 randomly selected to represent 2 tribes living on or near their rural reservations. First, we examined the prevalence and correlates of use of biomedical services and traditional healing for both physical health and psychiatric problems. Second, we developed logistic regression models predicting the independent and combined use of biomedical services and traditional healing RESULTS: The prevalence of combined and independent use of biomedical services and traditional healing varied by tribe. The prevalence of biomedical service use ranged from 40.9% to 59.1% for physical health problems and 6.4% to 6.8% for psychiatric problems. The prevalence of the use of traditional healing ranged from 8.4% to 22.9% for physical health problems and 3.2% to 7.8% for psychiatric problems. Although combined use of both types of services was common (10.4-22.6% of service users), many used only traditional healing (3.5-40.0%). Correlates of service use included age, educational level, and ethnic identity. For example, use of traditional healing was correlated with higher scores on a scale measuring identification with American Indian culture CONCLUSIONS: Both biomedical services and traditional healing are important sources of care in American Indian communities, and are used both independently and in combination with one another.

Adolescent↗

PubMed1990

The dependence of human bone texture on life style.

Neutron diffraction has been used to determine the preferred orientation of the hydroxyapatite crystals at the lower front edge of the tibia. The bones are compared for two Neolithic Orkney tribes. At Isbister, a muscular tribe on a hilly site engaged in heavy uphill work, whereas a tribe at Quanterness lived on level ground. The two sets are contrasted with the texture of present-day amputations. Values of 16, 8 and 3 are found for an 'index of manoeuvrability' for the Isbister, Quanterness and modern ankles, respectively.

Bone and Bones↗

PubMed1995

16S rRNA gene sequence of Neorickettsia helminthoeca and its phylogenetic alignment with members of the genus Ehrlichia.

Neorickettsia helminthoeca (tribe Ehrlichieae, family Rickettsiaceae) is the agent of salmon poisoning disease, which affects members of the family Canidae. This bacterium is unusual in that it is the only known obligately intracellular bacterium that is transmitted via a helminth vector. The nucleotide sequence of the N. helminthoeca 16S rRNA gene was determined and compared with the sequences of intracellular bacteria belonging to the alpha subgroup of the Proteobacteria. The N. helminthoeca sequence was most similar to the sequences of two Ehrlichia species, Ehrlichia risticii and Ehrlichia sennetsu (levels of sequence similarity, > 95%). All other members of the tribe Ehrlichieae, including members of the other Ehrlichia species, and the related species Cowdria ruminantium and Anaplasma marginale, were only distantly related phylogenetically (levels of sequence similarity, 84 to 86%). Our results corroborate the results of previous ultrastructural and Western blot (immunoblot) comparisons of N. helminthoeca with other ehrlichial species. The genus Ehrlichia is phylogenetically incoherent and can be separated into three identifiable clusters of species. Each cluster is closely associated with a species classified in another non-Ehrlichia bacterial genus. The close relationships among N. helminthoeca, E. risticii, and E. sennetsu and the striking differences between these organisms and other members of the tribe Ehrlichieae suggest that in the future, these organisms should be treated as members of a new bacterial genus separate from the genus Ehrlichia.

Animals↗

PubMed2003

Socially mediated speciation.

We employ a simple model to show that social selection can lead to prezygotic reproductive isolation. The evolution of social discrimination causes the congealing of phenotypically similar individuals into different, spatially distinct tribes. However, tribal formation is only obtained for certain types of social behavior: altruistic and selfish acts can produce tribes, whereas spiteful and mutualistic behaviors never do. Moreover, reduced hybrid fitness at tribal borders leads to the selection of mating preferences, which then spread to the core areas of the respective tribes. Unlike models of resource competition, our model generates reproductive isolation in an ecologically homogeneous environment. We elaborate on how altruistic acts can lead to reproductive isolation, but also predict that certain types of competition can lead to the speciation effect. Our theory provides a framework for how individual-level interactions mold lineage diversification, with parapatric speciation as a possible end product.

Social Behavior↗

PubMed1997

Episodic evolution and turnover of HLA-B in the indigenous human populations of the Americas.

Nucleotide sequences were determined for the HLA-A, B and C alleles of three populations of Amerindians: the Havasupai tribe from North America, and the Guarani and Kaingang tribes from South America. All 15 Havasupai alleles are found in Eastern Hemisphere populations, whereas the Guarani and Kaingang each have six alleles that appear to be present only in the Western Hemisphere. Nine of the "new" alleles come from HLA-B, one comes from HLA-A and one from HLA-C: ten appear to be the result of recombination and one the result of point substitution. Of the 14 Guarani alleles and 16 Kaingang alleles, only four are held in common. Despite their differences, the three tribes possess comparable numbers of HLA class I alleles, revealing a trend for "allele turnover", in which new alleles tends to supplant older alleles rather than supplement them. Although many new HLA-B alleles have been produced in Latin America, their net effect has been to differentiate populations, not to increase allele diversity within a population. From sequence comparisons, the Amerindian subset of HLA class I allotypes appears to cover the overall ranges of peptide binding specificity, natural killer-cell interactions, and CD8 interactions, that are found in all HLA class I. The recombinations that produced the new alleles of the Kaingang and Guarani class I are predicted to have modulated these functional properties rather than radically change them. Exchange of Bw4 and Bw6 motifs by recombination are noticeably absent in the events forming new alleles in America, whereas they have been the most common of recombinations elsewhere.

Alleles↗

PubMed1998

Interorganizational collaboration: a cautionary note for tribal health nurses.

As the Indian Health Service restructures and more Indian tribes assume control for their health care services, more collaborative initiatives between Indian tribal health and other organizations may be anticipated. This paper addresses the topic of interorganizational collaboration and tribal health care. There are unique issues related to Indian tribal healthcare, and this paper provides a cautionary note to public health nurses who work with and for Indian tribes. Interorganizational collaboration and tribal health care will of be interest not only to the public health nurses working for a tribe, but also to the county and state public health nurses who may be entering into a collaborative effort with a tribal health care agency.

Community Health Nursing↗

PubMed1993

Alpha-keto acids are novel siderophores in the genera Proteus, Providencia, and Morganella and are produced by amino acid deaminases.

Growth promotion and iron transport studies revealed that certain alpha-keto acids generated by amino acid deaminases, by enterobacteria of the Proteus-Providencia-Morganella group (of the tribe Proteeae), show significant siderophore activity. Their iron-binding properties were confirmed by the chrome azurol S assay and UV spectra. These compounds form ligand-to-metal charge transfer bands in the range of 400 to 500 nm. Additional absorption bands of the enolized ligands at 500 to 700 nm are responsible for color formation. Siderophore activity was most pronounced with alpha-keto acids possessing an aromatic or heteroaromatic side chain, like phenylpyruvic acid and indolylpyruvic acid, resulting from deamination of phenylalanine and tryptophan, respectively. In addition, alpha-keto acids possessing longer nonpolar side chains, like alpha-ketoisocaproic acid or alpha-ketoisovaleric acid and even alpha-ketoadipic acid, also showed siderophore activity which was absent or negligible with smaller alpha-keto acids or those possessing polar functional groups, like pyruvic acid, alpha-ketobutyric acid, or alpha-ketoglutaric acid. The fact that deaminase-negative enterobacteria, like Escherichia coli and Salmonella spp., could not utilize alpha-keto acids supports the view that specific iron-carboxylate transport systems have evolved in members of the tribe Proteeae and are designed to recognize ferric complexes of both alpha-hydroxy acids and alpha-keto acids, of which the latter can easily be generated by L-amino acid deaminases in an amino acid-rich medium. Exogenous siderophores, like ferric hydroxamates (ferrichromes) and ferric polycarboxylates (rhizoferrin and citrate), were also utilized by members of the tribe Proteeae.

Amino Acids↗

PubMedDate not supplied

The Awá-Guajá Indians of the Brazilian Amazon. Demographic data, serum protein markers and blood groups.

The South-American Indian group Awá-Guajá, currently living in the State of Maranhão (Northeastern Brazil), is one of the most recently contacted Indian groups of the Brazilian Amazon. This group is made up by three partially isolated villages named Awá, Guajá and Juriti, and is characterized by having a young population, in which 47.6% of the individuals range from 0 to 14 years old. The sex ratios (male/female) for people of reproductive age are 1.13 for Awá village, 2.00 for Guajá, 3.33 for Juriti and 1.61 for the tribe as a whole. Fst and heterogeneity analysis show that, despite the small differences observed among villages for the eight genetic systems analyzed, the Awá-Guajá tribe is constituted of only one population. Furthermore, comparisons between Awá-Guajá and Urubú-Kaapor tribes indicate that they are still isolated genetically, in spite of the fact that they share territories.

Adolescent↗

PubMed1999

A newly identified nonsecretor allele of the human histo-blood group alpha(1,2)fucosyltransferase gene (FUT2).

BACKGROUND AND OBJECTIVES: The human Secretor alpha(1, 2)fucosyltransferase gene determines the ABH secretor status and influences the Lewis phenotype of an individual. Studies were carried out on the Lewis (a+b-) nonsecretors of different groups indigenous to Taiwan to demonstrate their se genotypes. METHODS: The Lewis phenotype of the blood samples was determined by a microplate method. The se genotypes of the individuals with the Lewis (a+b-) phenotype were analyzed by a polymerase chain reaction restriction fragment length polymorphism (PCR-RFLP) method designed for the se alleles reported previously. PCR and cloning techniques were used to determine the coding sequence of the novel se gene. RESULTS: A new se allele, se685, with a three-nucleotide deletion of GTGGT to GT in the coding region of nucleotides 685 through 689 was identified in a Le (a+b-) nonsecretor from the Ami tribe indigenous to Taiwan. The deletion predicts the loss of the amino acid Val230 in the corresponding secretor enzyme's C-terminal segment. The distribution of the se685 allele in the Ami tribe was further verified by PCR-RFLP analysis. CONCLUSION: The Se gene exhibits heterogeneity with some Se alleles being common but others displaying a unique distribution in different ethnic populations. The newly identified se685 allele seems to exist only in the Ami tribe indigenous to Taiwan.

ABO Blood-Group System↗

PubMed2005

Extinction of LINE-1 activity coincident with a major mammalian radiation in rodents.

LINE-1 transposable elements (L1s) are ubiquitous in mammals and are thought to have remained active since before the mammalian radiation. Only one L1 extinction event, in South American rodents in the genus Oryzomys, has been convincingly demonstrated. Here we examine the phylogenetic limits and evolutionary tempo of that extinction event by characterizing L1s in related rodents. Fourteen genera from five tribes within the Sigmodontinae subfamily were examined. Only the Sigmodontini, the most basal tribe in this group, demonstrate recent L1 activity. The Oryzomyini, Akodontini, Phyllotini, and Thomasomyini contain only L1s that appear to have inserted long ago; their L1s lack open reading frames, have mutations at conserved amino acid residues, and show numerous private mutations. They also lack restriction site-defined L1 subfamilies specific to any species, genus or tribe examined, and fail to form monophyletic species, genus or tribal L1 clusters. We determine here that this L1 extinction event occurred roughly 8.8 million years ago, near the divergence of Sigmodon from the remaining Sigmodontinae species. These species appear to be ideal model organisms for studying the impact of L1 inactivity on mammalian genomes.

Animals↗

PubMed2006

Ugandan Kaposi's sarcoma-associated herpesvirus phylogeny: evidence for cross-ethnic transmission of viral subtypes.

OBJECTIVE: The aim of this study was to test the relationship between Kaposi's sarcoma-associated herpesvirus (KSHV) phylogeny and host ethnicity at the within-country scale. METHODS: KSHV genomic DNA samples were isolated from 31 patients across eleven Ugandan ethnic groups. Amino acid sequences of the ORF-K1 gene were used to construct a neighbor-joining phylogenetic tree. RESULTS: A5 and B1 variants predominated with no evidence of distinct ethnic or geographic distribution. A new K1 subtype (F) was identified in a member of the Bantu Gisu tribe and a new subtype B variant (B3) among members of the Bantu Ganda tribe. CONCLUSIONS: The phylogeny may yet be structured by host ethnicity if members of Ugandan groups have convoluted biological origins, even as they identify with single tribes. An alternative possibility is that KSHV subtype evolution may have preceded major diversification of sub-Saharan Africans into ethnicities as we know them today, with ethnic groups beginning their histories already hosting multiple subtypes. A third alternative is that horizontal transmission of multiple KSHV subtypes may have broken up vertical lineages of the virus passed down within Ugandan populations.

Amino Acid Sequence↗

PubMed1982

Identification of several electrophoretic variants of human ceruloplasmin including CpMichigan, a new polymorphism.

Two new electrophoretic variants of human ceruloplasmin (Cp) were detected in studies of a population from Ann Arbor, Mich., USA. The Cp Michigan variant occurs as a polymorphism in both Caucasians and Negroes while the Cp C-Ann Arbor-1 variant was identified in a single family. During reexamination of Cp variants previously detected among Amerindian tribes, a new variant Cp A-Wap-1 was identified in the Macushi and Wapishana tribes as being different from the variant observed in the Xavante and Cayapo tribes.

Adult↗

PubMedDate not supplied

Beta-globin gene cluster haplotypes of Amerindian populations from the Brazilian Amazon region.

We have determined the beta-globin cluster haplotypes for 80 Indians from four Brazilian Amazon tribes: Kayapó, Wayampí, Wayana-Apalaí, and Arára. The results are analyzed together with 20 Yanomámi previously studied. From 2 to 4 different haplotypes were identified for each tribe, and 7 of the possible 32 haplotypes were found in a sample of 172 chromosomes for which the beta haplotypes were directly determined or derived from family studies. The haplotype distribution does not differ significantly among the five populations. The two most common haplotypes in all tribes were haplotypes 2 and 6, with average frequencies of 0.843 and 0.122, respectively. The genetic affinities between Brazilian Indians and other human populations were evaluated by estimates of genetic distance based on haplotype data. The lowest values were observed in relation to Asians, especially Chinese, Polynesians, and Micronesians.

Brazil↗

PubMed2006

Diabetes prevention in Indian country: developing nutrition models to tell the story of food-system change.

The disruption of the traditional food systems of Native Americans is generally believed to have contributed to the epidemic levels of type 2 diabetes and obesity present on U.S. Indian reservations today. Tribes are increasingly engaged in disease prevention and health promotion efforts including restoring components of their traditional food system. This article discusses the development of nutrition models for tribes in two regions; California and the Three Affiliated Tribes of North Dakota. Each nutrition model tells the story of food system change and its health consequences through narrative and cultural imagery. Ultimately the models suggest ways to eat that reflect the traditional food pattern by using contemporary and traditional foods available today.

Diabetes Mellitus↗

PubMed2001

Group- and sex-specific effects of age, body composition and pulse rate on blood pressure variability in some cross-cultural populations of Visakhapatnam District; South India.

BACKGROUND: Hypertension is becoming a major public health problem in developing countries. Blood pressure tends to vary cross-culturally and is influenced by various factors including age, body composition and pulse rate. This paper reports the influence of age, body composition and pulse rate on blood pressure variability. DESIGN: The data were collected from 1316 individuals (646 men and 670 women) belonging to two tribes (Khondh and Valmiki) inhabiting hilly tribal area and two castes (Wadabalija and Settibalija) from both rural and urban areas from Visakhapatnam district, Andhra Pradesh, India. RESULTS: There are considerable ethnic differences in blood pressure and body composition variables. Age contributes significantly to the variance in blood pressure in these populations. However the influence of age is less pronounced in Khondh, a primitive/unacculturized tribe, while age exerts a profound effect on blood pressure variability in Valmiki, an acculturizing tribe. Further, the effect of age is more pronounced on systolic than on diastolic pressure and it contributes more to the blood pressure of women than men. The subcutaneous fatness measures (sum of three trunk skin fold thicknesses and sum of three extremities skin fold thicknesses) are significant predictors of both systolic and diastolic blood pressure in Khondh, Valmiki and Wadabalija, while body mass index (BMI) is an important predictor of both systolic and diastolic blood pressure in Settibalija. Pulse rate is often found to influence blood pressure of women. CONCLUSION: The age-associated variability of blood pressure confirms the proposition that variability is high in adverse environment, when modernization/acculturization is taken to represent environmental adversity. Apart from the influence of age, body composition/adiposity contributes significantly to the blood pressure variability.

Age Factors↗

PubMed2002

Immunoglobulin allotypes among Taiwan aborigines: evidence of malarial selection could affect studies of population affinity.

The aborigines of Taiwan represent the indigenous inhabitants of the island at the time of the arrival of the Chinese from the mainland. Linguistically, the aboriginal Taiwanese are related to the Malayo-Polynesian-speaking inhabitants of Indonesia and the Philippines. Three tribes occupied lowland areas while six tribes occupied highland areas. Previous studies indicate that genetic markers associated with malaria occur in lowland populations. Though the GM haplotypes are demonstrated to be very useful in the measure of population affinities, the possibility of malarial selection on this locus could affect studies of population affinity. The present work is a case study to see whether a subdivided insular population under a possible selective load will provide divergent clustering analysis depending on the population sampled. Immunoglobulin allotype (GM and KM) profiles were generated on 230 lowland and 407 highland Taiwan Aborigines from the nine tribes. A highly significant difference in GM haplotype distribution was detected between lowland and highland populations (adjusted G = 69.408, 2 df [degrees of freedom], p < 0.00001). There were no significant differences in KM*1 frequency by altitude. The Taiwan Aboriginal GM and KM frequencies were compared to data from Indonesians, Vietnamese, Thai, Malay, Chinese from Taiwan, and Ryukyu Islanders from Okinawa using cluster analysis. The lowland populations plot among the Thai (N, NC) and Malayan Aborigines. In contrast, the highland and total Taiwan Aborigine samples plot with the Indonesian, Vietnamese, and Malayan Negrito samples. Thus, depending on the populations of Taiwan Aborigines used, different conclusions could be reached. The highland population supports the published linguistic ties; however, the lowland population does not support the linguistic relationship with Indonesian populations but is more closely related to Thai and Malays, or reflects a similar selection history.

Analysis of Variance↗

PubMed2004

Genetic structure and gene flow in Gran Chaco populations of Argentina: evidence from Y-chromosome markers.

The Gran Chaco region of central South America has been settled by humans for only the last 4,000-5,000 years. To investigate population structure and variation in this region's indigenous population, we scored males from tribes of the Argentinean part of the Gran Chaco (Pilagá, Wichí, and Toba, representing two major language groups, the Mataco and Guaycurú) for a number of Y-chromosome polymorphisms. The markers included eight microsatellites (DYS19, DYS390, DYS391, DYS392, DYS393, DYS437, DYS438, and DYS439) and the unique native American single nucleotide polymorphism, DYS199. Sixty males (77%) from the total sample carried the DYS199T chromosome, and these were the focus of the present analysis. Unlike most other native Americans, Gran Chaco males show a moderate level of diversity at the DYS19 locus but still less than that seen in non-native Americans. The FST value for Y-chromosome markers in Gran Chaco was 0.107, a value that is more than double that found for mtDNA haplogroups in the same tribes but is not particularly high compared with other Y-chromosome studies. Phylogenetic trees based on all eight microsatellites showed relatively poor correlation of the tribes with either geography or language, and this is possibly explained by their ecology. They are seasonal hunters living in small bands, and under such circumstances drift will be a powerful evolutionary force. An UPGMA tree based on five microsatellites (DYS19, DYS390, DYS391, DYS392, and DYS393), however, showed a more positive relationship, suggesting that DYS437, DYS438, and DYS439 may behave differently from the other microsatellites. No association was found between maternal and paternal lineage distributions. The time to the most recent common ancestor of the DYS199T chromosome is calculated to lie between 13,000 and 26,000 years. This range is consistent with estimates from other Y-chromosome studies as well as with estimates from mtDNA and the archeology of the colonization of South America. We conclude that the male lineages present in the contemporary Gran Chaco population reflect the level of diversity found in South America and that the region's male founders did not carry a restricted gene pool.

Argentina↗

PubMed2006

Body mass index and chronic energy deficiency of adult males of Central Indian populations.

Data on body weight, height, and sitting height from 11,496 adult males, age 18-62 years, belonging to 38 different populations of five major social groups (scheduled tribes, scheduled castes, "other backward castes," general castes, and Muslims) of Central India were taken for our analysis to assess the nutritional status of these groups. Cormic index and body mass index (BMI) were computed, and an analysis of variance (ANOVA) was carried out among different populations as well as among social groups separately on Cormic index and BMI. Shape, size, and generalized distances among the different social groups were computed and dendrograms were drawn. The level of malnutrition is the lowest among the general castes. The opposite is the case with the scheduled castes and scheduled tribes. Comparison of the coefficient of variation shows that there is variation in weight and BMI but that there is no marked variation in the other anthropometric variables. The ANOVA on Cormic index and BMI suggests that the people within a population are more homogeneous than the people between populations. There is a positive but statistically insignificant correlation between Cormic index and BMI. The five social groups differ more in size distance than in shape distance. According to the dendrogram of generalized distance values, the Muslims and the general castes can be grouped into one cluster and the scheduled castes, scheduled tribes, and other backward castes can be grouped into another cluster.

Adolescent↗