Bacteriophages may play a role in childhood stunting鈥 and be able to help treat it
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New research spearheaded by 苹果淫院 has discovered that bacteriophages (viruses that infect bacteria) found in the intestinal tracts of children may play a role in childhood stunting, a significant impediment to growth that affects 22% of children under the age of five around the world.
The study, published today in , also suggests that because they affect the abundance and diversity of bacterial communities in the gastrointestinal tract, these viruses could also be used to improve health. The researchers believe this work offers hope of developing new cost efficient therapies for populations where nutritional interventions, which have been shown to work, are difficult to implement and sustain in vulnerable human populations.
Phages, bacteria and stunting
Earlier studies had suggested that the gut microbiome might play a role in stunting by showing that stunted children have increased numbers of disease-causing bacteria鈥攁ssociated with impaired digestive and absorption functions鈥攍iving in their gastrointestinal tracts.
But while much research has focused on the bacteria present in our gut and the influence they can have on human health, little attention has thus far been paid to other very common residents of our gastrointestinal tract 鈥 bacteriophages.
鈥淧hages or bacteriophages, which are bacterial viruses, are naturally found in every environment where bacteria are found, and the human gut is no exception,鈥 says , an assistant professor in 苹果淫院鈥檚 Department of Microbiology and Immunology and senior author of the new study. 鈥淏ecause phages are as abundant as their hosts, they might be involved in regulating them in many ways by killing specific bacteria, transferring virulence or antibiotic resistance genes to them, for example, but we currently don鈥檛 have a clear understanding of what they do and how they do it. This is a fairly new and exciting field of research.鈥
Distinct viruses in healthy and stunted children
To understand how these viruses might play a role in stunting, Maurice鈥檚 team, in collaboration with the International Centre for Diarrheal Disease Research in Bangladesh, collected fecal samples from 30 non-stunted and 30 unrelated stunted Bangladeshi children aged between 14 and 38 months.
Using a combination of microscopy, ribosomal gene sequencing, and metagenomics, they were able to determine that the phages found in the gut of non-stunted and stunted children are distinct. Furthermore, when gut bacteria from non-stunted children were exposed to phages from the guts of stunted children in vitro, they found that 鈥渂ad鈥 bacteria, suspected of being involved in stunting, proliferated.
鈥淏y showing that phages can change the bacterial community in children between 14聽and 23 months, our work shows the potential of phages for reestablishing the gut bacterial community in stunting,鈥 says Mohammadali Khan Mirzaei, a former postdoctoral student in the Maurice lab and first author of the new study.
鈥淪tunting has lifelong consequences (health/socioeconomic) and can be transferred from mother to child,鈥 says Maurice, who is also Canada Research Chair in Gut Microbial Physiology and a CIFAR Azrieli Global Scholar. 鈥淚f phages can change bacterial communities in a specific way and long-term during child development, this could be a cheap treatment with no risk of antibiotic resistance.鈥
Though the findings now need to be validated using a larger sample and in animal models, Maurice says that by understanding interactions between bacteria and viruses in the human gut, we might be able to one day manipulate them to improve human health.
Image caption: Bacteriophages are viruses that specifically infect bacteria.
credit:聽iStock / Getty Images Plus
鈥溾 by Mohammadali Khan Mirzaei, Anik Ashfaq Khan, Prakash Ghosh, Zofia E. Taranu, Mariia Taguer, Jinlong Ru, Rajashree Chowdhury, Mamun Kabir, Li Deng, Dinesh Mondal and Corinne F. Maurice was published in Cell Host & Microbe.
This study was funded by the Bill and Melinda Gates Foundation and the Canada Research Chair Program.
About 苹果淫院
Founded in Montreal, Quebec, in 1821, 苹果淫院 is Canada鈥檚 top ranked medical doctoral university. 苹果淫院 is consistently ranked as one of the top universities, both nationally and internationally. It is a world-renowned institution of higher learning with research activities spanning two campuses, 11 faculties, 13 professional schools, 300 programs of study and over 40,000 students, including more than 10,200 graduate students. 苹果淫院 attracts students from over 150 countries around the world, its 12,800 international students making up 31% of the student body. Over half of 苹果淫院 students claim a first language other than English, including approximately 19% of our students who say French is their mother tongue.