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1.
Sci Rep ; 12(1): 7214, 2022 05 04.
Article in English | MEDLINE | ID: mdl-35508562

ABSTRACT

Population genetic studies of North Asian ethnic groups have focused on genetic variation of sex chromosomes and mitochondria. Studies of the extensive variation available from autosomal variation have appeared infrequently. We focus on relationships among population samples using new North Asia microhaplotype data. We combined genotypes from our laboratory on 58 microhaplotypes, distributed across 18 autosomes, on 3945 individuals from 75 populations with corresponding data extracted for 26 populations from the Thousand Genomes consortium and for 22 populations from the GenomeAsia 100 K project. A total of 7107 individuals in 122 total populations are analyzed using STRUCTURE, Principal Component Analysis, and phylogenetic tree analyses. North Asia populations sampled in Mongolia include: Buryats, Mongolians, Altai Kazakhs, and Tsaatans. Available Siberians include samples of Yakut, Khanty, and Komi Zyriane. Analyses of all 122 populations confirm many known relationships and show that most populations from North Asia form a cluster distinct from all other groups. Refinement of analyses on smaller subsets of populations reinforces the distinctiveness of North Asia and shows that the North Asia cluster identifies a region that is ancestral to Native Americans.


Subject(s)
Asian People , Genetics, Population , Asian People/genetics , Ethnicity/genetics , Genetic Variation , Haplotypes , Humans , Phylogeny , Principal Component Analysis
2.
Int J Legal Med ; 132(3): 703-711, 2018 May.
Article in English | MEDLINE | ID: mdl-29248957

ABSTRACT

Microhaplotypes have become a new type of forensic marker with a great ability to identify and deconvolute mixtures because massively parallel sequencing (MPS) allows the alleles (haplotypes) of the multi-SNP loci to be determined directly for an individual. As originally defined, a microhaplotype locus is a short segment of DNA with two or more SNPs defining three or more haplotypes. The length is short enough, less than about 300 bp, that the read length of current MPS technology can produce a phase-known sequence of each chromosome of an individual. As part of the discovery phase of our studies, data on 130 microhaplotype loci with estimates of haplotype frequency data on 83 populations have been published. To provide a better picture of global allele frequency variation, we have now tested 13 more populations for 65 of the microhaplotype loci from among those with higher levels of inter-population gene frequency variation, including 8 loci not previously published. These loci provide clear distinctions among 6 biogeographic regions and provide some information distinguishing up to 10 clusters of populations.


Subject(s)
Genetics, Population , Haplotypes , Gene Frequency , High-Throughput Nucleotide Sequencing , Humans , Polymorphism, Single Nucleotide , Principal Component Analysis
3.
Hum Biol ; 87(2): 73-91, 2015 Apr.
Article in English | MEDLINE | ID: mdl-26829292

ABSTRACT

Genetic data on North and Central Asian populations are underrepresented in the literature, especially for autosomal markers. In the present study we used 812 single nucleotide polymorphisms (SNPs) distributed across all the human autosomes and extensively studied at Yale to examine the affinities of two recently collected samples of populations: rural and cosmopolitan Mongolians from Ulaanbaatar and nomadic, Turkic-speaking Tsaatan from Mongolia near the Siberian border. We compare these two populations with each other and with a global set of populations and discuss their relationships to New World populations. Specifically, we analyze data on 521 autosomal loci (single SNPs and multi-SNP haplotypes) studied in 57 populations representing all the major geographical regions of the world. We conclude that these North and Central Asian populations are genetically distinct from all other populations in our study and may be close to the ancestral lineage leading to the New World populations.


Subject(s)
Archaeology/methods , Asian People/genetics , Asia, Central/ethnology , DNA/chemistry , DNA/genetics , Evolution, Molecular , Gene Frequency , Genetics, Population , Haplotypes , Humans , Mongolia , Polymorphism, Single Nucleotide , Saliva/chemistry
4.
Perit Dial Int ; 35(1): 31-4, 2015.
Article in English | MEDLINE | ID: mdl-24584605

ABSTRACT

BACKGROUND: Despite adverse effects such as constipation, vascular calcification, and hypercalcemia, calcium-based salts are relatively affordable and effective phosphate binders that remain in widespread use in the dialysis population. We conducted a pilot study examining whether the use of a combined magnesium/calcium-based binder was as effective as calcium carbonate at lowering serum phosphate levels in peritoneal dialysis (PD) patients. METHODS: This was a cross-over, investigator-masked pilot study in which prevalent PD patients received calcium carbonate alone (200 mg calcium per tablet) or calcium magnesium carbonate (100 mg calcium, 85 mg magnesium per tablet). Primary outcome was serum phosphate level at 3 months. Analysis was as per protocol. RESULTS: Twenty patients were recruited, 17 completed the study. Mean starting dose was 11.35 ± 7.04 pills per day of MgCaCO3 and 9.00 ± 4.97 pills per day of CaCO3. Mean phosphate levels fell from 2.13 mmol/L to 2.01 mmol/L (95% confidence interval (CI): 1.76 - 2.30, p = 0.361) in the MgCaCO3 group, and 1.81 mmol/L (95% CI: 1.56 - 2.0, p = 0.026) in the CaCO3 alone group. Six (35%) patients taking MgCaCO3 and 9 (54%) taking CaCO3 alone achieved Kidney Disease Outcomes Quality Initiative (KDOQI) serum phosphate targets at 3 months. Diarrhea developed in 9 patients taking MgCaCO3 and 3 taking CaCO3. Serum magnesium exceeded 1.4 mmol/L in 5 patients taking MgCaCO3 while serum calcium exceeded 2.65 mmol/L in 3 patients receiving CaCO3. When compared to the initial dose, the prescribed dose at 3 months was reduced by 44% (to 6.41 tablets/day) in the MgCaCO3 group and by 8% (to 8.24 pills per day) in the CaCO3 alone group. CONCLUSION: Compared with CaCO3 alone, the preparation and dose of MgCaCO3 used in this pilot study was no better at lowering serum phosphate levels in PD patients, and was associated with more dose-limiting side effects.


Subject(s)
Calcium Carbonate/administration & dosage , Hyperphosphatemia/drug therapy , Magnesium/administration & dosage , Peritoneal Dialysis/adverse effects , Administration, Oral , Adult , Aged , Cross-Over Studies , Dose-Response Relationship, Drug , Drug Administration Schedule , Female , Follow-Up Studies , Humans , Hyperphosphatemia/blood , Male , Middle Aged , Patient Compliance , Peritoneal Dialysis/methods , Pilot Projects , Risk Assessment , Single-Blind Method , Treatment Outcome
5.
Clin J Am Soc Nephrol ; 7(2): 297-303, 2012 Feb.
Article in English | MEDLINE | ID: mdl-22134627

ABSTRACT

BACKGROUND AND OBJECTIVES: Infectious complications remain a significant cause of peritoneal dialysis (PD) technique failure. Topical ointments seem to reduce peritonitis; however, concerns over resistance have led to a quest for alternative agents. This study examined the effectiveness of applying topical Polysporin Triple ointment (P(3)) against mupirocin in a multi-centered, double-blind, randomized controlled trial. DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS: PD patients routinely applied either P(3) or mupirocin ointment to their exit site. Patients were followed for 18 months or until death or catheter removal. The primary study outcome was a composite endpoint of exit-site infection (ESI), tunnel infection, or peritonitis. RESULTS: Seventy-five of 201 randomized patients experienced a primary outcome event (51 peritonitis episodes, 24 ESIs). No difference was seen in the time to first event for P(3) (13.2 months; 95% confidence interval, 11.9-14.5) and mupirocin (14.0 months; 95% confidence interval, 12.7-15.4) (P=0.41). Twice as many patients reported redness at the exit site in the P(3) group (14 versus 6, P=0.10). Over the complete study period, a higher rate per year of fungal ESIs was seen in patients using P(3) (0.07 versus 0.01; P=0.02) with a corresponding increase in fungal peritonitis (0.04 versus 0.00, respectively; P<0.05). CONCLUSIONS: This study shows that P(3) is not superior to mupirocin in the prophylaxis of PD-related infections. Colonization of the exit site with fungal organisms is of concern and warrants further study. As such, the use of P(3) over mupirocin is not advocated in the prophylaxis of PD-related infections.


Subject(s)
Anti-Bacterial Agents/administration & dosage , Antibiotic Prophylaxis , Bacitracin/administration & dosage , Catheter-Related Infections/prevention & control , Catheters, Indwelling/adverse effects , Gramicidin/administration & dosage , Mupirocin/administration & dosage , Mycoses/prevention & control , Peritoneal Dialysis/adverse effects , Peritonitis/prevention & control , Polymyxin B/administration & dosage , Administration, Topical , Aged , Anti-Bacterial Agents/adverse effects , Antibiotic Prophylaxis/adverse effects , Bacitracin/adverse effects , Catheter-Related Infections/microbiology , Catheter-Related Infections/mortality , Disease-Free Survival , Double-Blind Method , Drug Combinations , Female , Gramicidin/adverse effects , Humans , Kaplan-Meier Estimate , Male , Middle Aged , Mupirocin/adverse effects , Mycoses/microbiology , Mycoses/mortality , Ontario , Peritoneal Dialysis/instrumentation , Peritoneal Dialysis/mortality , Peritonitis/microbiology , Peritonitis/mortality , Polymyxin B/adverse effects , Time Factors , Treatment Outcome
6.
J Am Soc Nephrol ; 14(1): 187-96, 2003 Jan.
Article in English | MEDLINE | ID: mdl-12506151

ABSTRACT

Transplantation offers superior life expectancy and quality of life compared with dialysis in young patients with end-stage renal failure. However, the initial risks of mortality and morbidity are high. This study used a decision analysis model to evaluate the costs and benefits of kidney transplantation versus continued dialysis for older patients with renal failure. A decision analytic model comparing cadaveric renal transplantation to continued hemodialysis treatment was developed. The base case considered a theoretical cohort of patients aged 65 yr without known comorbidity or contraindications to transplantation who would have to wait 2 yr for a cadaveric transplant. Separate models were constructed for patients with diabetes or cardiovascular disease and for patients receiving an organ after a variety of wait-list times. Probability, utility, and survival data were obtained from published reports and renal registries. For 65-yr-old patients, quality-adjusted life expectancy increased by 1.1 quality-adjusted life years (QALY) at an incremental cost of $67,778 per QALY. Assuming a 2-yr wait-listed time, transplantation remained economically attractive for 70-yr-old patients (incremental cost effectiveness [ICE], $79,359 per QALY) but was less economically attractive for those over 75 yr of age (ICE, $99,553) or for 70-yr-olds with either cardiovascular disease or diabetes (ICE, $126,751 and $161,090 per QALY, respectively). The analytic results were sensitive only to the time spent waiting for the graft. The cost-effectiveness reduced such that the costs associated with one QALY were in excess of $100,000/yr when the probability of a complication was > or = 50% per 3-mo cycle and when the utility of transplantation fell below 0.62. If available within a timely period, transplantation may offer substantial clinical benefits to older patients at a reasonable financial cost. Prolonged waiting times dramatically decrease the clinical benefits and economic attractiveness of transplantation, suggesting that living donor transplantation may be of particular benefit in this population.


Subject(s)
Decision Support Techniques , Kidney Transplantation , Aged , Cost-Benefit Analysis , Health Care Costs , Humans , Kidney Transplantation/economics , Life Expectancy , Quality of Life , Renal Dialysis , Time Factors , Waiting Lists
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