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Pearson marrow-pancreas syndrome
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Reviewed May 2013
What is Pearson marrow-pancreas syndrome?
Pearson marrow-pancreas syndrome is a severe disorder that usually begins in infancy. It causes problems with the development of blood-forming (hematopoietic) cells in the bone marrow that have the potential to develop into different types of blood cells. For this reason, Pearson marrow-pancreas syndrome is considered a bone marrow failure disorder. Function of the pancreas and other organs can also be affected.
Most affected individuals have a shortage of red blood cells (anemia), which can cause pale skin (pallor), weakness, and fatigue. Some of these individuals also have low numbers of white blood cells (neutropenia) and platelets (thrombocytopenia). Neutropenia can lead to frequent infections; thrombocytopenia sometimes causes easy bruising and bleeding. When visualized under the microscope, bone marrow cells from affected individuals may appear abnormal. Often, early blood cells (hematopoietic precursors) have multiple fluid-filled pockets called vacuoles. In addition, red blood cells in the bone marrow can have an abnormal buildup of iron that appears as a ring of blue staining in the cell after treatment with certain dyes. These abnormal cells are called ring sideroblasts.
In people with Pearson marrow-pancreas syndrome, the pancreas does not work as well as usual. The pancreas produces and releases enzymes that aid in the digestion of fats and proteins. Reduced function of this organ can lead to high levels of fats in the liver (liver steatosis). The pancreas also releases insulin, which helps maintain correct blood sugar levels. A small number of individuals with Pearson marrow-pancreas syndrome develop diabetes, a condition characterized by abnormally high blood sugar levels that can be caused by a shortage of insulin. In addition, affected individuals may have scarring (fibrosis) in the pancreas.
People with Pearson marrow-pancreas syndrome have a reduced ability to absorb nutrients from the diet (malabsorption), and most affected infants have an inability to grow and gain weight at the expected rate (failure to thrive). Another common occurrence in people with this condition is buildup in the body of a chemical called lactic acid (lactic acidosis), which can be life-threatening. In addition, liver and kidney problems can develop in people with this condition.
About half of children with this severe disorder die in infancy or early childhood due to severe lactic acidosis or liver failure. Many of those who survive develop signs and symptoms later in life of a related disorder called Kearns-Sayre syndrome. This condition causes weakness of muscles around the eyes and other problems.
Read more about Kearns-Sayre syndrome.
How common is Pearson marrow-pancreas syndrome?
Pearson marrow-pancreas syndrome is a rare condition; its prevalence is unknown.
What are the genetic changes related to Pearson marrow-pancreas syndrome?
Pearson marrow-pancreas syndrome is caused by defects in mitochondria, which are structures within cells that use oxygen to convert the energy from food into a form cells can use. This process is called oxidative phosphorylation. Although most DNA is packaged in chromosomes within the nucleus (nuclear DNA), mitochondria also have a small amount of their own DNA, called mitochondrial DNA (mtDNA). This type of DNA contains many genes essential for normal mitochondrial function. Pearson marrow-pancreas syndrome is caused by single, large deletions of mtDNA, which can range from 1,000 to 10,000 DNA building blocks (nucleotides). The most common deletion, which occurs in about 20 percent of affected individuals, removes 4,997 nucleotides.
The mtDNA deletions involved in Pearson marrow-pancreas syndrome result in the loss of genes that provide instructions for proteins involved in oxidative phosphorylation. These deletions impair oxidative phosphorylation and decrease the energy available to cells. It is not clear how loss of mtDNA leads to the specific signs and symptoms of Pearson marrow-pancreas syndrome, although the features of the condition are likely related to a lack of cellular energy.
Read more about mitochondrial DNA.
How do people inherit Pearson marrow-pancreas syndrome?
Pearson marrow-pancreas syndrome is generally not inherited but arises from new (de novo) mutations that likely occur in early embryonic development.
Where can I find information about diagnosis or management of Pearson marrow-pancreas syndrome?
These resources address the diagnosis or management of Pearson marrow-pancreas syndrome and may include treatment providers.
General information about the diagnosis and management of genetic conditions is available in the Handbook. Read more about genetic testing, particularly the difference between clinical tests and research tests.
To locate a healthcare provider, see How can I find a genetics professional in my area? in the Handbook.
Where can I find additional information about Pearson marrow-pancreas syndrome?
You may find the following resources about Pearson marrow-pancreas syndrome helpful. These materials are written for the general public.
You may also be interested in these resources, which are designed for healthcare professionals and researchers.
What other names do people use for Pearson marrow-pancreas syndrome?
What if I still have specific questions about Pearson marrow-pancreas syndrome?
Where can I find general information about genetic conditions?
The Handbook provides basic information about genetics in clear language.
These links provide additional genetics resources that may be useful.
What glossary definitions help with understanding Pearson marrow-pancreas syndrome?
acidosis ; anemia ; bone marrow ; cell ; deletion ; diabetes ; digestion ; DNA ; embryonic ; failure to thrive ; fibrosis ; hematopoietic ; insulin ; iron ; kidney ; lactic acid ; lactic acidosis ; liver failure ; liver steatosis ; malabsorption ; mitochondria ; neutropenia ; nucleus ; oxidative phosphorylation ; oxygen ; pallor ; pancreas ; phosphorylation ; platelets ; prevalence ; syndrome ; thrombocytopenia ; white blood cells
You may find definitions for these and many other terms in the Genetics Home Reference Glossary.
See also Understanding Medical Terminology.
References (4 links)
The resources on this site should not be used as a substitute for professional medical care or advice. Users seeking information about a personal genetic disease, syndrome, or condition should consult with a qualified healthcare professional. See How can I find a genetics professional in my area? in the Handbook.