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Ask Joanna Melia, MD, what her biggest practice challenge is, and she’d say the need for more precision medicine in inflammatory bowel disease.

Gastroenterologists have more treatments at their disposal today than ever before, particularly in the last decade. “We have had tremendous advances in many areas of understanding contributors to disease,” said Dr. Melia, an assistant professor of medicine at Johns Hopkins Medicine in Baltimore who specializes in inflammatory bowel disease (IBD). But the hurdle is in translating the science to clinical care that is individualized to each patient based on condition and stage of the condition.

Melia_Joanna_Maryland_web.jpg
Dr. Joanna Melia

“That still remains a bit of a dream,” she said. Much of her career has been devoted to chasing down a particular genetic variant that contributes to IBD, with the goal of reaching more precise treatments for patients.

In an interview, she shared how she entered this line of work, and what her research has revealed about Crohn’s disease, manganese, and a common genetic variant known as ZIP8.



Q: Your expertise is in inflammatory bowel disease and manganese deficiency. Why did you choose these two areas as your focus in GI?

Dr. Melia: In talking to many patients with IBD, I was always struck by the questions around nutritional factors related to disease. As a fellow, I was embedded in a lab that focused on genetics of IBD. A micronutrient transporter, ZIP8, has a mutation in it that increases the risk of Crohn’s disease.

I’ve dedicated the last 8 years to understanding how this mutation can increase risk. It initially started out as a project focused on zinc, because that’s what the transporter was thought to regulate. However, it’s evolved as we’ve learned more about it, underscoring the importance of manganese, another micronutrient that we derive from food.

We have established that having this mutation changes how the body handles manganese and affects downstream processes that involve manganese. What I’m doing now is trying to connect those dots on why those processes are important in Crohn’s disease and whether we can target them for treatment.



Q: How does manganese deficiency lead to chronic IBD?

Dr. Melia: In individuals with this mutation, their blood manganese levels are lower than people who don’t have this mutation. When we talk about manganese deficiency or insufficiency, what we’re really talking about is lower blood levels. But it’s more complicated than that at the tissue level.

What we and other groups are working on right now is trying to understand if the manganese levels change in the gut and what happens in inflammation. The gut is a particularly interesting area for manganese, in that much of the manganese that we eat is excreted. We only absorb a small amount of it. And so, manganese levels within the gut lumen may actually be quite high – and may be even higher in inflammation. But there are things we don’t understand about that and how it relates to mucosal levels of manganese and Crohn’s disease. The ileum, the site of the Crohn’s disease that’s specifically associated with this mutation, might be particularly sensitive to changes in the manganese levels or the downstream processes that changing manganese availability affects.

One of those processes is glycosylation. Manganese is important to properly glycosylate your proteins. Many enzymes help cells put sugars on proteins, and many of those enzymes need manganese to do it. Glycosylation of proteins is important so cells know where those proteins should go, and the sugars help them stay where they need to be. When you change protein glycosylation, you can stress the cells. We know individuals who carry this mutation have changes in the glycosylation of their proteins. What we’re working on right now is understanding which key proteins might change when that happens, and why that’s a potential problem, especially in the ileum.

 

 



Q: How might your research inform clinical practice?

Dr. Melia: We’ve seen significant progress in new medications and new pathways that have emerged. We still have this fundamental problem that our immune-targeting medicines are only helping about 50% of the patients.

It’s critical that we begin to identify new pathways. And my hope is that in studying genes like the ZIP8 (SLC39A8), which is associated with the dysregulated processing of manganese, we can understand different pathways and mechanisms to target.

As an example, if we could help correct the glycosylation problem, that would help to boost the barrier function of the gut and perhaps decrease the activation of those immune cells, because you’re just reinforcing the barrier integrity of the gut.

We want to target that glycosylation problem as we would treat patients with congenital disorders of glycosylation by giving supplemental sugars. We think this problem of glycosylation extends beyond patients with the ZIP8 mutation, but it is also really important for patients with the mutation. So, the goal would be to use ZIP8 genetics to help prioritize patients for therapy targeting this problem.



Q: You’re involved in the American Gastroenterological Association Future Leaders Program. What is your role in this program? Why is it important?

Dr. Melia: I was very grateful for the opportunity to participate in the AGA’s Future Leaders Program. I think it was exceedingly valuable for two main reasons. One, it really offered an insight into the role of the AGA and the important role that the AGA plays in the careers of gastroenterologists. Two, it was such a unique opportunity to work with colleagues nationwide and to build a network of individuals who are all at a similar stage in their careers. It was a very inspiring group to meet and to have the opportunity to work with as part of that program, and I thank the AGA for supporting such an initiative.



Q: What teacher or mentor had the greatest impact on you?

Dr. Melia: I have been blessed by many clinical and research mentors through my career. I was inspired to do science at the lab of Ramnik Xavier, MD, at Massachusetts General Hospital. At Johns Hopkins, I credit Cindy Sears, MD, and Anne Marie O’Broin Lennon, MBBCh, PhD, as two physician scientists who have really shaped how I have tried to integrate my clinical and research career.

LIGHTNING ROUND

Do you prefer texting or talking?
Texting

If you weren’t a gastroenterologist, what would you be?
Teacher

What was the last movie you watched?
Great Bear Rainforest

What is your most favorite city in the U.S.?
Surry, Maine

What song do you absolutely have to sing along with when you hear it?
Any song by Whitney Houston.

Are you an introvert or extrovert?
Introvert

How many cups of coffee do you drink per day?
One

Publications
Topics
Sections

Ask Joanna Melia, MD, what her biggest practice challenge is, and she’d say the need for more precision medicine in inflammatory bowel disease.

Gastroenterologists have more treatments at their disposal today than ever before, particularly in the last decade. “We have had tremendous advances in many areas of understanding contributors to disease,” said Dr. Melia, an assistant professor of medicine at Johns Hopkins Medicine in Baltimore who specializes in inflammatory bowel disease (IBD). But the hurdle is in translating the science to clinical care that is individualized to each patient based on condition and stage of the condition.

Melia_Joanna_Maryland_web.jpg
Dr. Joanna Melia

“That still remains a bit of a dream,” she said. Much of her career has been devoted to chasing down a particular genetic variant that contributes to IBD, with the goal of reaching more precise treatments for patients.

In an interview, she shared how she entered this line of work, and what her research has revealed about Crohn’s disease, manganese, and a common genetic variant known as ZIP8.



Q: Your expertise is in inflammatory bowel disease and manganese deficiency. Why did you choose these two areas as your focus in GI?

Dr. Melia: In talking to many patients with IBD, I was always struck by the questions around nutritional factors related to disease. As a fellow, I was embedded in a lab that focused on genetics of IBD. A micronutrient transporter, ZIP8, has a mutation in it that increases the risk of Crohn’s disease.

I’ve dedicated the last 8 years to understanding how this mutation can increase risk. It initially started out as a project focused on zinc, because that’s what the transporter was thought to regulate. However, it’s evolved as we’ve learned more about it, underscoring the importance of manganese, another micronutrient that we derive from food.

We have established that having this mutation changes how the body handles manganese and affects downstream processes that involve manganese. What I’m doing now is trying to connect those dots on why those processes are important in Crohn’s disease and whether we can target them for treatment.



Q: How does manganese deficiency lead to chronic IBD?

Dr. Melia: In individuals with this mutation, their blood manganese levels are lower than people who don’t have this mutation. When we talk about manganese deficiency or insufficiency, what we’re really talking about is lower blood levels. But it’s more complicated than that at the tissue level.

What we and other groups are working on right now is trying to understand if the manganese levels change in the gut and what happens in inflammation. The gut is a particularly interesting area for manganese, in that much of the manganese that we eat is excreted. We only absorb a small amount of it. And so, manganese levels within the gut lumen may actually be quite high – and may be even higher in inflammation. But there are things we don’t understand about that and how it relates to mucosal levels of manganese and Crohn’s disease. The ileum, the site of the Crohn’s disease that’s specifically associated with this mutation, might be particularly sensitive to changes in the manganese levels or the downstream processes that changing manganese availability affects.

One of those processes is glycosylation. Manganese is important to properly glycosylate your proteins. Many enzymes help cells put sugars on proteins, and many of those enzymes need manganese to do it. Glycosylation of proteins is important so cells know where those proteins should go, and the sugars help them stay where they need to be. When you change protein glycosylation, you can stress the cells. We know individuals who carry this mutation have changes in the glycosylation of their proteins. What we’re working on right now is understanding which key proteins might change when that happens, and why that’s a potential problem, especially in the ileum.

 

 



Q: How might your research inform clinical practice?

Dr. Melia: We’ve seen significant progress in new medications and new pathways that have emerged. We still have this fundamental problem that our immune-targeting medicines are only helping about 50% of the patients.

It’s critical that we begin to identify new pathways. And my hope is that in studying genes like the ZIP8 (SLC39A8), which is associated with the dysregulated processing of manganese, we can understand different pathways and mechanisms to target.

As an example, if we could help correct the glycosylation problem, that would help to boost the barrier function of the gut and perhaps decrease the activation of those immune cells, because you’re just reinforcing the barrier integrity of the gut.

We want to target that glycosylation problem as we would treat patients with congenital disorders of glycosylation by giving supplemental sugars. We think this problem of glycosylation extends beyond patients with the ZIP8 mutation, but it is also really important for patients with the mutation. So, the goal would be to use ZIP8 genetics to help prioritize patients for therapy targeting this problem.



Q: You’re involved in the American Gastroenterological Association Future Leaders Program. What is your role in this program? Why is it important?

Dr. Melia: I was very grateful for the opportunity to participate in the AGA’s Future Leaders Program. I think it was exceedingly valuable for two main reasons. One, it really offered an insight into the role of the AGA and the important role that the AGA plays in the careers of gastroenterologists. Two, it was such a unique opportunity to work with colleagues nationwide and to build a network of individuals who are all at a similar stage in their careers. It was a very inspiring group to meet and to have the opportunity to work with as part of that program, and I thank the AGA for supporting such an initiative.



Q: What teacher or mentor had the greatest impact on you?

Dr. Melia: I have been blessed by many clinical and research mentors through my career. I was inspired to do science at the lab of Ramnik Xavier, MD, at Massachusetts General Hospital. At Johns Hopkins, I credit Cindy Sears, MD, and Anne Marie O’Broin Lennon, MBBCh, PhD, as two physician scientists who have really shaped how I have tried to integrate my clinical and research career.

LIGHTNING ROUND

Do you prefer texting or talking?
Texting

If you weren’t a gastroenterologist, what would you be?
Teacher

What was the last movie you watched?
Great Bear Rainforest

What is your most favorite city in the U.S.?
Surry, Maine

What song do you absolutely have to sing along with when you hear it?
Any song by Whitney Houston.

Are you an introvert or extrovert?
Introvert

How many cups of coffee do you drink per day?
One

Ask Joanna Melia, MD, what her biggest practice challenge is, and she’d say the need for more precision medicine in inflammatory bowel disease.

Gastroenterologists have more treatments at their disposal today than ever before, particularly in the last decade. “We have had tremendous advances in many areas of understanding contributors to disease,” said Dr. Melia, an assistant professor of medicine at Johns Hopkins Medicine in Baltimore who specializes in inflammatory bowel disease (IBD). But the hurdle is in translating the science to clinical care that is individualized to each patient based on condition and stage of the condition.

Melia_Joanna_Maryland_web.jpg
Dr. Joanna Melia

“That still remains a bit of a dream,” she said. Much of her career has been devoted to chasing down a particular genetic variant that contributes to IBD, with the goal of reaching more precise treatments for patients.

In an interview, she shared how she entered this line of work, and what her research has revealed about Crohn’s disease, manganese, and a common genetic variant known as ZIP8.



Q: Your expertise is in inflammatory bowel disease and manganese deficiency. Why did you choose these two areas as your focus in GI?

Dr. Melia: In talking to many patients with IBD, I was always struck by the questions around nutritional factors related to disease. As a fellow, I was embedded in a lab that focused on genetics of IBD. A micronutrient transporter, ZIP8, has a mutation in it that increases the risk of Crohn’s disease.

I’ve dedicated the last 8 years to understanding how this mutation can increase risk. It initially started out as a project focused on zinc, because that’s what the transporter was thought to regulate. However, it’s evolved as we’ve learned more about it, underscoring the importance of manganese, another micronutrient that we derive from food.

We have established that having this mutation changes how the body handles manganese and affects downstream processes that involve manganese. What I’m doing now is trying to connect those dots on why those processes are important in Crohn’s disease and whether we can target them for treatment.



Q: How does manganese deficiency lead to chronic IBD?

Dr. Melia: In individuals with this mutation, their blood manganese levels are lower than people who don’t have this mutation. When we talk about manganese deficiency or insufficiency, what we’re really talking about is lower blood levels. But it’s more complicated than that at the tissue level.

What we and other groups are working on right now is trying to understand if the manganese levels change in the gut and what happens in inflammation. The gut is a particularly interesting area for manganese, in that much of the manganese that we eat is excreted. We only absorb a small amount of it. And so, manganese levels within the gut lumen may actually be quite high – and may be even higher in inflammation. But there are things we don’t understand about that and how it relates to mucosal levels of manganese and Crohn’s disease. The ileum, the site of the Crohn’s disease that’s specifically associated with this mutation, might be particularly sensitive to changes in the manganese levels or the downstream processes that changing manganese availability affects.

One of those processes is glycosylation. Manganese is important to properly glycosylate your proteins. Many enzymes help cells put sugars on proteins, and many of those enzymes need manganese to do it. Glycosylation of proteins is important so cells know where those proteins should go, and the sugars help them stay where they need to be. When you change protein glycosylation, you can stress the cells. We know individuals who carry this mutation have changes in the glycosylation of their proteins. What we’re working on right now is understanding which key proteins might change when that happens, and why that’s a potential problem, especially in the ileum.

 

 



Q: How might your research inform clinical practice?

Dr. Melia: We’ve seen significant progress in new medications and new pathways that have emerged. We still have this fundamental problem that our immune-targeting medicines are only helping about 50% of the patients.

It’s critical that we begin to identify new pathways. And my hope is that in studying genes like the ZIP8 (SLC39A8), which is associated with the dysregulated processing of manganese, we can understand different pathways and mechanisms to target.

As an example, if we could help correct the glycosylation problem, that would help to boost the barrier function of the gut and perhaps decrease the activation of those immune cells, because you’re just reinforcing the barrier integrity of the gut.

We want to target that glycosylation problem as we would treat patients with congenital disorders of glycosylation by giving supplemental sugars. We think this problem of glycosylation extends beyond patients with the ZIP8 mutation, but it is also really important for patients with the mutation. So, the goal would be to use ZIP8 genetics to help prioritize patients for therapy targeting this problem.



Q: You’re involved in the American Gastroenterological Association Future Leaders Program. What is your role in this program? Why is it important?

Dr. Melia: I was very grateful for the opportunity to participate in the AGA’s Future Leaders Program. I think it was exceedingly valuable for two main reasons. One, it really offered an insight into the role of the AGA and the important role that the AGA plays in the careers of gastroenterologists. Two, it was such a unique opportunity to work with colleagues nationwide and to build a network of individuals who are all at a similar stage in their careers. It was a very inspiring group to meet and to have the opportunity to work with as part of that program, and I thank the AGA for supporting such an initiative.



Q: What teacher or mentor had the greatest impact on you?

Dr. Melia: I have been blessed by many clinical and research mentors through my career. I was inspired to do science at the lab of Ramnik Xavier, MD, at Massachusetts General Hospital. At Johns Hopkins, I credit Cindy Sears, MD, and Anne Marie O’Broin Lennon, MBBCh, PhD, as two physician scientists who have really shaped how I have tried to integrate my clinical and research career.

LIGHTNING ROUND

Do you prefer texting or talking?
Texting

If you weren’t a gastroenterologist, what would you be?
Teacher

What was the last movie you watched?
Great Bear Rainforest

What is your most favorite city in the U.S.?
Surry, Maine

What song do you absolutely have to sing along with when you hear it?
Any song by Whitney Houston.

Are you an introvert or extrovert?
Introvert

How many cups of coffee do you drink per day?
One

Publications
Publications
Topics
Article Type
Sections
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But the hurdle is in translating the science to clinical care that is individualized to each patient based on condition and stage of the condition.<br/><br/>[[{"fid":"298336","view_mode":"medstat_image_flush_right","fields":{"format":"medstat_image_flush_right","field_file_image_alt_text[und][0][value]":"Joanna Melia, MD, gastroenterologist, Johns Hopkins Medicine","field_file_image_credit[und][0][value]":"","field_file_image_caption[und][0][value]":"Dr. Joanna Melia"},"type":"media","attributes":{"class":"media-element file-medstat_image_flush_right"}}]]“That still remains a bit of a dream,” she said. Much of her career has been devoted to chasing down a particular genetic variant that contributes to IBD, with the goal of reaching more precise treatments for patients. <br/><br/>In an interview, she shared how she entered this line of work, and what her research has revealed about Crohn’s disease, manganese, and a common genetic variant known as ZIP8.</p> <p> <strong><br/><br/>Q: Your expertise is in inflammatory bowel disease and manganese deficiency. Why did you choose these two areas as your focus in GI? </strong> </p> <p><strong>Dr. Melia: </strong>In talking to many patients with IBD, I was always struck by the questions around nutritional factors related to disease. As a fellow, I was embedded in a lab that focused on genetics of IBD. A micronutrient transporter, ZIP8, has a mutation in it that increases the risk of Crohn’s disease.<br/><br/>I’ve dedicated the last 8 years to understanding how this mutation can increase risk. It initially started out as a project focused on zinc, because that’s what the transporter was thought to regulate. However, it’s evolved as we’ve learned more about it, underscoring the importance of manganese, another micronutrient that we derive from food. <br/><br/>We have established that having this mutation changes how the body handles manganese and affects downstream processes that involve manganese. What I’m doing now is trying to connect those dots on why those processes are important in Crohn’s disease and whether we can target them for treatment.</p> <p> <strong><br/><br/>Q: How does manganese deficiency lead to chronic IBD? </strong> </p> <p><strong>Dr. Melia:</strong> In individuals with this mutation, their blood manganese levels are lower than people who don’t have this mutation. When we talk about manganese deficiency or insufficiency, what we’re really talking about is lower blood levels. But it’s more complicated than that at the tissue level. <br/><br/>What we and other groups are working on right now is trying to understand if the manganese levels change in the gut and what happens in inflammation. The gut is a particularly interesting area for manganese, in that much of the manganese that we eat is excreted. We only absorb a small amount of it. And so, manganese levels within the gut lumen may actually be quite high – and may be even higher in inflammation. But there are things we don’t understand about that and how it relates to mucosal levels of manganese and Crohn’s disease. The ileum, the site of the Crohn’s disease that’s specifically associated with this mutation, might be particularly sensitive to changes in the manganese levels or the downstream processes that changing manganese availability affects.<br/><br/>One of those processes is glycosylation. Manganese is important to properly glycosylate your proteins. Many enzymes help cells put sugars on proteins, and many of those enzymes need manganese to do it. Glycosylation of proteins is important so cells know where those proteins should go, and the sugars help them stay where they need to be. When you change protein glycosylation, you can stress the cells. We know individuals who carry this mutation have changes in the glycosylation of their proteins. What we’re working on right now is understanding which key proteins might change when that happens, and why that’s a potential problem, especially in the ileum.</p> <p> <strong><br/><br/>Q: How might your research inform clinical practice?</strong> </p> <p><strong>Dr. Melia: </strong>We’ve seen significant progress in new medications and new pathways that have emerged. We still have this fundamental problem that our immune-targeting medicines are only helping about 50% of the patients. <br/><br/>It’s critical that we begin to identify new pathways. And my hope is that in studying genes like the ZIP8 (SLC39A8), which is associated with the dysregulated processing of manganese, we can understand different pathways and mechanisms to target. <br/><br/>As an example, if we could help correct the glycosylation problem, that would help to boost the barrier function of the gut and perhaps decrease the activation of those immune cells, because you’re just reinforcing the barrier integrity of the gut.<br/><br/>We want to target that glycosylation problem as we would treat patients with congenital disorders of glycosylation by giving supplemental sugars. We think this problem of glycosylation extends beyond patients with the ZIP8 mutation, but it is also really important for patients with the mutation. So, the goal would be to use ZIP8 genetics to help prioritize patients for therapy targeting this problem.</p> <p> <strong><br/><br/>Q: You’re involved in the <a href="https://gastro.org/aga-leadership/initiatives-and-programs/future-leaders-program/">American Gastroenterological Association Future Leaders Program</a>. What is your role in this program? Why is it important? </strong> </p> <p><strong>Dr. Melia:</strong> I was very grateful for the opportunity to participate in the AGA’s Future Leaders Program. I think it was exceedingly valuable for two main reasons. One, it really offered an insight into the role of the AGA and the important role that the AGA plays in the careers of gastroenterologists. Two, it was such a unique opportunity to work with colleagues nationwide and to build a network of individuals who are all at a similar stage in their careers. It was a very inspiring group to meet and to have the opportunity to work with as part of that program, and I thank the AGA for supporting such an initiative.</p> <p> <strong><br/><br/>Q: What teacher or mentor had the greatest impact on you?</strong> </p> <p><strong>Dr. Melia:</strong> I have been blessed by many clinical and research mentors through my career. I was inspired to do science at the lab of Ramnik Xavier, MD, at Massachusetts General Hospital. 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