Mutation discovered for joint disorder
Agency for Science, Technology and Research (A*STAR) Research News Oct 23, 2017
A rare genetic mutation associated with a developmental disorder could be a treatment target for related conditions in adults.
The discovery of a rare genetic mutation associated with a devastating developmental disorder called arthrogryposis multiplex congenita could also provide researchers with a new treatment target for a group of related neurodegenerative diseases, including multiple sclerosis, in adults.
Arthrogryposis multiplex congenita is a common birth defect, affecting around 1 in 3,000 live births. Babies with the disorder have stiff joints and their limbs become locked into awkward positions because of a lack of movement in the womb.
The disorder can be caused by crowding in utero  for example with twin pregnancies  but it also occurs when genetic mutations affect the normal development of muscles and nerves.
A study led by researchers from A*STAR looked at a group of families affected by a severe form of arthrogryposis that resulted in several fetuses dying before birth or soon after.
ÂWe knew that it was probably going to be genetic because many of these families had multiple individuals with this condition, said Shifeng Xue from the A*STAR Institute of Molecular and Cell Biology.
But when the researchers looked at the families genomes, they couldnÂt find any of the known mutations associated with arthrogryposis.
Instead they discovered a new mutation in the gene coding for a molecule called LGI4. This molecule is secreted by Schwann cells, which produce the fatty sheath called myelin that covers and insulates nerve cells, and enables them to conduct electrical impulses quickly and effectively. It suggests that LGI4 plays a key role in the myelination process.
LGI4 and Schwann cells operate in the peripheral nervous system - the parts that donÂt include the brain and spinal cord - which controls movement and sensory function.
This new mutation stopped the LGI4 gene from functioning altogether, so those affected by it didnÂt have any myelin on their peripheral nerve cells. This caused severe malformation of their limbs and also affected the muscles of the diaphragm so their lungs didnÂt develop properly.
The discovery means the mutation could be screened for in the early stages of pregnancy, and people with a family history of the disease could be offered genetic counseling before pregnancy. It also opens the door to research that could help adults with degenerative diseases such as multiple sclerosis, where the immune system attacks and destroys myelin.
ÂWeÂre hoping that by identifying LGI4 as being important for Schwann cell development, differentiation and myelination, we can possibly develop it as a therapeutic biologic to stimulate myelination, said Bruno Reversade, research director at the A*STAR Institute of Medical Biology.
Go to Original
The discovery of a rare genetic mutation associated with a devastating developmental disorder called arthrogryposis multiplex congenita could also provide researchers with a new treatment target for a group of related neurodegenerative diseases, including multiple sclerosis, in adults.
Arthrogryposis multiplex congenita is a common birth defect, affecting around 1 in 3,000 live births. Babies with the disorder have stiff joints and their limbs become locked into awkward positions because of a lack of movement in the womb.
The disorder can be caused by crowding in utero  for example with twin pregnancies  but it also occurs when genetic mutations affect the normal development of muscles and nerves.
A study led by researchers from A*STAR looked at a group of families affected by a severe form of arthrogryposis that resulted in several fetuses dying before birth or soon after.
ÂWe knew that it was probably going to be genetic because many of these families had multiple individuals with this condition, said Shifeng Xue from the A*STAR Institute of Molecular and Cell Biology.
But when the researchers looked at the families genomes, they couldnÂt find any of the known mutations associated with arthrogryposis.
Instead they discovered a new mutation in the gene coding for a molecule called LGI4. This molecule is secreted by Schwann cells, which produce the fatty sheath called myelin that covers and insulates nerve cells, and enables them to conduct electrical impulses quickly and effectively. It suggests that LGI4 plays a key role in the myelination process.
LGI4 and Schwann cells operate in the peripheral nervous system - the parts that donÂt include the brain and spinal cord - which controls movement and sensory function.
This new mutation stopped the LGI4 gene from functioning altogether, so those affected by it didnÂt have any myelin on their peripheral nerve cells. This caused severe malformation of their limbs and also affected the muscles of the diaphragm so their lungs didnÂt develop properly.
The discovery means the mutation could be screened for in the early stages of pregnancy, and people with a family history of the disease could be offered genetic counseling before pregnancy. It also opens the door to research that could help adults with degenerative diseases such as multiple sclerosis, where the immune system attacks and destroys myelin.
ÂWeÂre hoping that by identifying LGI4 as being important for Schwann cell development, differentiation and myelination, we can possibly develop it as a therapeutic biologic to stimulate myelination, said Bruno Reversade, research director at the A*STAR Institute of Medical Biology.
Only Doctors with an M3 India account can read this article. Sign up for free or login with your existing account.
4 reasons why Doctors love M3 India
-
Exclusive Write-ups & Webinars by KOLs
-
Daily Quiz by specialty
-
Paid Market Research Surveys
-
Case discussions, News & Journals' summaries