Battling Bovine Theileriosis: A Threat to Cattle
Learn about Theileriosis and its impact on cattle health and farming.
Pankaj Musale, Ajinkya Khilari, Rohini Gade, Velu Dhanikachalam, Santoshkumar Jadhav, Manali Bajpai, Bhagya Turakani, Akshay Joshi, Amar Prajapati, Anand Srivastava, Marimutthu Swaminathan, Sachin Joshi, Dhanasekaran Shanmugam
― 5 min read
Table of Contents
Bovine Theileriosis, often referred to simply as Theileriosis, is a significant disease that affects cows and buffaloes worldwide. This condition is caused by tiny parasites known as protozoa from the Theileria genus. You can think of these parasites as unwanted guests that make their home in our Cattle, and trust me, they’re not the kind of guests you’d like to have over for dinner!
How Do Cattle Get Infected?
Cattle get infected with Theileriosis through the bites of certain kinds of Ticks. These ticks are part of the Ixodidae family and include various species like Rhipicephalus, Hyalomma, and Haemaphysalis. These ticks come equipped with their unique styles and preferences. They don’t just bite any old animal; they have favorites! Depending on the region, you might find different types of ticks that spread different strains of Theileriosis.
For instance, one type of Theileria, called T. parva, mostly hangs out in Africa, while another, T. orientalis, has a wider range, popping up in parts of Asia and Oceania. There’s also T. annulata, which can be found in places like North Africa and parts of the Mediterranean.
What Are the Symptoms?
Cattle infected with Theileriosis can show several symptoms. The most common include fever and anemia, which can be as concerning as finding out that the last piece of chocolate cake is gone! In severe cases, these symptoms can lead to death, which is obviously a big deal for farmers. The chronic issues caused by this disease can also lead to decreased health in the animals and result in economic losses, especially in countries with large cattle populations, like India.
In India alone, the economic losses from Theileriosis are estimated to exceed $780 million. That’s enough money to buy a whole lot of chocolate cakes!
Managing the Infection
Farmers and veterinary experts use several strategies to manage Theileriosis. One approach is keeping ticks at bay using special chemicals known as acaricides. These chemicals work like bug spray for ticks, but they come with their own set of challenges.
Another line of defense is vaccination. In India, there is a vaccine called RAKSHAVAC-T that helps protect cattle from this pesky disease. Additionally, treatment options are available, with a drug called Buparvaquone (BQO) being the most effective against Theileriosis.
However, there's a catch: Theileria parasites can become resistant to BQO, leading to treatment failures. Imagine going to a restaurant, ordering your favorite dish, and then finding out they've changed the recipe, making it taste awful-now that’s frustrating!
Resistance an Issue?
Why Is theThe resistance of Theileria parasites to Buparvaquone is a major concern for the livestock industry. When parasites become resistant, it means that farmers have fewer options to treat their cattle and prevent the spread of the disease. This can lead to increased infections, heavier losses, and even more stressed-out farmers.
Scientists have discovered that some of these resistance issues come from changes in genes that code for specific proteins in the parasites. For example, mutations in the cytochrome b (cytb) gene have been shown to play a significant role in resistance to BQO. Think of this gene as the parasite's power source. Changes here can interrupt their ability to respond well to the medication.
Researchers have also been digging into other genes like the dihydroorotate dehydrogenase (DHODH) gene and the pin1 gene to understand if they might also contribute to resistance. It’s like a genetic treasure hunt to uncover all the secrets of these parasites.
The Need for Research
With the growing problem of drug resistance, researchers are diving deep to understand how these genetic changes occur and how they contribute to the resistance against BQO. They’ve collected blood samples from cattle across India and are studying the genetic material of the parasites to see what mutations are present and how they relate to the disease’s impact.
The results from this research could lead to improved treatment options, better preventive measures, and ultimately a healthier cattle population. Researchers aim to ensure that future farmers won’t have to face the same challenges their predecessors did.
What’s the Plan Ahead?
To tackle Theileriosis effectively, continuous monitoring and research are necessary. Scientists are developing and refining methods to identify and track drug resistance patterns in cattle. This ongoing work will assist in crafting better strategies for disease control.
As they discover more about how Theileria parasites operate and evolve, they hope to find new ways to outsmart these pesky invaders. After all, nobody likes uninvited guests, especially when they threaten to ruin the feast for everyone else!
Conclusion
Bovine Theileriosis is a significant health threat to cattle around the world, and understanding the disease is essential for protecting livestock and the livelihoods of farmers. By studying the parasites and their resistance to treatment, experts aim to develop more effective strategies for managing and preventing this challenging disease.
So next time you see a cow, remember that it’s not just mooing; it’s part of a complex battle against germs, ticks, and, yes, even genetic mutations!
Imagine a world where our farmers can grow their herds without fear of disease. That would be a sight to behold-like a cow-themed festival with happy cattle dancing around!
Title: Identification of genetic variation in genes linked to buparvaquone resistance in Theileria sp infecting dairy cattle in India.
Abstract: Buparvaquone (BQO) is used for treatment of bovine theileriosis, a tickborne disease caused by parasites of the Theileria genus. Studies on T. annulata have linked the mechanism of BQO resistance predominantly to genetic variations in the parasite cytochrome b (cytb) gene. In addition, cryptic mechanisms of resistance involving the parasite peptidyl-prolyl isomerase (pin1) and dihydroorotate dehydrogenase (dhodh) genes require assessment. In India, where bovine theileriosis is endemic, and BQO is widely used for treatment, monitoring and establishing the link between genetic variations in cytb, dhodh and pin1 genes and BQO resistance is essential. In this study, multiplexed PCR amplification and nanopore sequencing approaches were used for genotyping the complete gene loci of the target genes. Analysis of 420 T. annulata field samples collected from seven different states of India revealed the presence of previously reported variations S129G, A146T and P253S in cytb and A53P in pin1, which are linked to BQO resistance. The role of A146T, a highly prevalent variation which mostly co-occurred with I203V, in BQO resistance needs to be evaluated. From 60 samples having T. orientalis infection, the genetic variations identified from the three genes were found to be mostly natural variations based on the reference genotypes and were distinct from T. annulata variations. This study has revealed the presence of BQO resistance-linked cytb gene mutations in T. annulata infecting dairy cattle in India and establishes a nanopore sequencing method for molecular surveillance of genetic variation in field samples. Author SummaryBuparvaquone (BQO) is the most effective drug that is available for the treatment of cattle theileriosis caused by parasites of the Theileria genus. However, treatment failure due to drug resistance is reported, and gene mutations linked to BQO resistance have been reported in African and Middle Eastern countries. These mutations occur in the cytochrome b (cytb) and peptidyl-prolyl isomerase (pin1) genes in the parasite. In this study, genetic variations occurring in these two genes and the parasite dihydroorotate dehydrogenase (dhodh) gene have been mapped using PCR amplification and Nanopore sequencing from field samples collected from seven different states of India. At least three previously reported mutations linked to BQO resistance were found in the T. annulata cytb gene sequence obtained from field samples. While one of these mutations (A146T) was highly prevalent, the other two were found to occur in only a few samples. Similarly, the BQO resistance linked to A53P mutation in the T. annulata pin1 gene was present in only a few samples. Despite their low frequency, the presence of these mutations reveals the existence of BQO resistance due to genetic variations in the parasite population present in India. This is the first comprehensive report of BQO resistance-conferring mutations occurring in Theileria parasites affecting dairy cattle in India and establishes a scalable method for large-scale molecular surveillance studies.
Authors: Pankaj Musale, Ajinkya Khilari, Rohini Gade, Velu Dhanikachalam, Santoshkumar Jadhav, Manali Bajpai, Bhagya Turakani, Akshay Joshi, Amar Prajapati, Anand Srivastava, Marimutthu Swaminathan, Sachin Joshi, Dhanasekaran Shanmugam
Last Update: 2024-12-01 00:00:00
Language: English
Source URL: https://www.biorxiv.org/content/10.1101/2024.11.28.625829
Source PDF: https://www.biorxiv.org/content/10.1101/2024.11.28.625829.full.pdf
Licence: https://creativecommons.org/licenses/by/4.0/
Changes: This summary was created with assistance from AI and may have inaccuracies. For accurate information, please refer to the original source documents linked here.
Thank you to biorxiv for use of its open access interoperability.
Reference Links
- https://veupathdb.org
- https://www.ncbi.nlm.nih.gov
- https://primalscheme.com/
- https://nanoporetech.com/document/rapid-sequencing-gdna-barcoding-sqk-rbk114
- https://github.com/PankajMusale1988/RAMPART_TannulataMultiplex_Genes_Cytb_Dhodh_Pin1
- https://github.com/PankajMusale1988/RAMPART_TorientalisMultiplex_Genes_Cytb_Dhodh_Pin1
- https://github.com/ajinkyakhilari/ampAssem
- https://github.com/ajinkyakhilari/AmpVarPro
- https://www.ncbi.nlm.nih.gov/Structure/cdd/cdd.shtml