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The Gut Microbiota of Colombians Differs from That of Americans

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The Gut Microbiota of Colombians Differs from That of Americans Escobar et al. BMC Microbiology (2014) 14:311 DOI 10.1186/s12866-014-0311-6 RESEARCH ARTICLE Open Access The gut microbiota of Colombians differs from that of Americans, Europeans and Asians Juan S Escobar1*, Bernadette Klotz2,3, Beatriz E Valdes1,4 and Gloria M Agudelo1,5 Abstract Background: The composition of the gut microbiota has recently been associated with health and disease, particularly with obesity. Some studies suggested a higher proportion of Firmicutes and a lower proportion of Bacteroidetes in obese compared to lean people; others found discordant patterns. Most studies, however, focused on Americans or Europeans, giving a limited picture of the gut microbiome. To determine the generality of previous observations and expand our knowledge of the human gut microbiota, it is important to replicate studies in overlooked populations. Thus, we describe here, for the first time, the gut microbiota of Colombian adults via the pyrosequencing of the 16S ribosomal DNA (rDNA), comparing it with results obtained in Americans, Europeans, Japanese and South Koreans, and testing the generality of previous observations concerning changes in Firmicutes and Bacteroidetes with increasing body mass index (BMI). Results: We found that the composition of the gut microbiota of Colombians was significantly different from that of Americans, Europeans and Asians. The geographic origin of the population explained more variance in the composition of this bacterial community than BMI or gender. Concerning changes in Firmicutes and Bacteroideteswithobesity,inColombianswefoundatendencyinFirmicutestodiminishwithincreasingBMI, whereas no change was observed in Bacteroidetes. A similar result was found in Americans. A more detailed inspection of the Colombian dataset revealed that five fiber-degrading bacteria, including Akkermansia, Dialister, Oscillospira, Ruminococcaceae and Clostridiales, became less abundant in obese subjects. Conclusion: We contributed data from unstudied Colombians that showed that the geographic origin of the studied population had a greater impact on the composition of the gut microbiota than BMI or gender. Any strategy aiming to modulate or control obesity via manipulation of this bacterial community should consider this effect. Keywords: Bacterial diversity, Microbiome, Geography, Firmicutes, Bacteroidetes, Obesity, Pyrosequencing, Latin America, Colombia Background the gut epithelium [6], synthesize essential vitamins Our body hosts a vast and mostly unexplored microbial and regulate fat storage [7]. However, dysbiosis is associ- world known as the human microbiota [1]. The microbiota ated with clinical conditions, such as obesity [8], diabetes is likely our most intimate connection with the environ- [9,10] and cancer [11]. ment. Recent investigations have highlighted the integral Regarding obesity, it has been shown that dietary changes role these microorganisms play in human physiology, alter the gut microbiota in a way that causes its metabolic health and disease [2]. In the gastrointestinal tract, the gut activity to favor energy acquisition from ingested food, microbiota is mostly composed of anaerobic bacteria of contribute with nutrient absorption and facilitate being the Firmicutes and Bacteroidetes phyla [1,3,4]. These mi- stocked in adipose tissue [12,13] through a diversity of croorganisms are beneficial to the host since they confer mechanisms [12,14]. It has been demonstrated that an in- resistance to pathogens [5], stimulate the proliferation of crease caloric intake, either produced by a high-fat diet [15] or by overfeeding in genetically obese mice [16], se- * Correspondence: [email protected] lects an obesogenic microbiota. Studies in animal models 1 Vidarium Nutrition, Health and Wellness Research Center, Grupo Nutresa, have shown that shifts in the gut microbiota following Calle 8 sur #50-67, Medellín, Colombia Full list of author information is available at the end of the article weight gain occur in a way that causes obese animals © 2014 Escobar et al.; licensee BioMed Central. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated. Escobar et al. BMC Microbiology (2014) 14:311 Page 2 of 14 to have proportionally less Bacteroidetes and more dataset in terms of the target population (apparently Firmicutes than lean animals [16-19]. In humans, how- healthy adults; apparently healthy refers to the fact that ever, evidence is less clear. Ley et al. [20] studied 12 no clinical examination preceded the selection process obese individuals following different low-calorie diets and information on health status was fully based on the and found that weight reduction increased the proportion self-declaration of the volunteers), used similar methods of Bacteroidetes and reduced that of Firmicutes, eventu- to characterize the gut microbiota (compelling diversity ally reaching the composition of lean subjects. In contrast, analyses using next-generation sequencing) and sequenced other authors have described modifications in the com- overlapping regions of the 16S gene (V2). We first de- position of the gut microbiota with weight gain in differ- scribe how the new data from Colombians were obtained ent directions [21-25]. and then how we retrieved other data. One aspect that must be noted in the human stud- ies is that most of them have focused on Americans or Colombian dataset Europeans [1,26-29], giving a limited picture of the human We performed a cross-sectional study with apparently gut microbiome. It has been established that the compos- healthy adults of both genders from the general population ition of the gut microbiota dramatically varies among living in Medellin, Colombia South America. Volunteers individuals [1,3,30] and populations [31,32] according to fulfilled the following inclusion criteria: BMI ≥18.5 kg/m2, the geographic [31-34] and ethnic origin [27,31,32,35], diet were non smokers, had not been diagnosed with gastro- [15,36-39], host genetics [25,40,41], age [31,42,43] and intestinal disease, had not consumed antibiotics or antipar- several other factors [44-53]. An open question is how asitics in the last four months, had not consumed laxatives these factors interact with BMI and explain discordant re- in the last two months, were not enrolled in any weight- sults about the composition of the gut microbiota in lean reduction program, were not consuming weight-loss sup- and obese subjects. plements, consumed less than 10 (women) or 15 (men) To expand our knowledge of the human microbiome drinks of alcohol per week, and did not exercise for more and determine the generality of previous observations than 10 hours per week. We enrolled 30 volunteers concerning shifts in the composition of the gut micro- (16 men and 14 women) who fulfilled these criteria. Note biota following weight gain, we describe, for the first that this sample size did not target any statistical power, time, the gut microbiota of a group of Colombian adults since there are no previous data on Colombians and the using high throughput DNA sequencing and compare it results of studies performed on other populations are with data previously obtained in other populations (USA, highly variable and, in many cases, contradictory [20-25]. Europe, Japan and South Korea). Note that Colombians Even among studies showing the same pattern, the magni- differ from Europeans, Americans and Asians in genetic tude of differences between lean and obese individuals terms, since they constitute an admixed population in- is very different. Therefore, the choice of one study or an- volving Native American, European and African ancestry other to calculate a sample size would have been totally in variable proportions [54-56] and have likely been arbitrary. Since this study constitutes a first attempt to exposed to different environmental conditions, including evaluate the statistical variability of the gut microbiota dietary habits and lifestyle [57,58]. We first asked whether among Colombians, it should be considered a pilot study. the composition of the gut microbiota differs with the Nonetheless, its sample size is comparable to that of previ- geographic origin of the host population. Next, we ex- ous influential studies [20,59-62]. plored how BMI affects the taxonomic composition of the gut microbiota and determined whether shifts in the composition of this bacterial community following weight Ethical approval gain operated at broad phylogenetic scales (e.g., at the The present study was conducted according to the guide- phylum level) or if they were produced by a reduced num- lines laid down in the Declaration of Helsinki. In addition, ber of bacterial phylotypes that, eventually, might become it was considered to have minimal risk according to targets to modulate or control obesity. the Colombian Ministry of Health (Article 11, Resolution 008430 of October 1993). All the volunteers were thor- Methods oughly informed about the study and procedures by a We analyzed five datasets (n = 126): original data con- member of the team. Participants were assured of anonym- tributed by us from a group of 30 Colombian volunteers ity and confidentiality.
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