Coffin-Lowry Syndrome

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This entry is adapted from the peer-reviewed paper https://medlineplus.gov/genetics/condition/coffin-lowry-syndrome

Coffin-Lowry syndrome is a condition that affects many parts of the body. The signs and symptoms are usually more severe in males than in females, although the features of this disorder range from very mild to severe in affected women.

genetic conditions

1. Introduction

Males with Coffin-Lowry syndrome typically have severe to profound intellectual disability and delayed development. Affected women may be cognitively normal, or they may have intellectual disability ranging from mild to profound. Beginning in childhood or adolescence, some people with this condition experience brief episodes of collapse when excited or startled by a loud noise. These attacks are called stimulus-induced drop episodes (SIDEs).

Most affected males and some affected females have distinctive facial features including a prominent forehead, widely spaced and downward-slanting eyes, a short nose with a wide tip, and a wide mouth with full lips. These features become more pronounced with age. Soft hands with short, tapered fingers are also characteristic of Coffin-Lowry syndrome. Additional features of this condition include short stature, an unusually small head (microcephaly), progressive abnormal curvature of the spine (kyphoscoliosis), and other skeletal abnormalities.

2. Frequency

The incidence of this condition is uncertain, but researchers estimate that the disorder affects 1 in 40,000 to 50,000 people.

3. Causes

Mutations in the RPS6KA3 gene cause Coffin-Lowry syndrome. This gene provides instructions for making a protein that is involved in signaling within cells. Researchers believe that this protein helps control the activity of other genes and plays an important role in the brain. The protein is involved in cell signaling pathways that are required for learning, the formation of long-term memories, and the survival of nerve cells. Gene mutations result in the production of little or no RPS6KA3 protein, but it is unclear how a lack of this protein causes the signs and symptoms of Coffin-Lowry syndrome.

Some people with the features of Coffin-Lowry syndrome do not have identified mutations in the RPS6KA3 gene. In these cases, the cause of the condition is unknown.

4. Inheritance

This condition is inherited in an X-linked dominant pattern. A condition is considered X-linked if the mutated gene that causes the disorder is located on the X chromosome, one of the two sex chromosomes. The inheritance is dominant if one copy of the altered gene in each cell is sufficient to cause the condition. In most cases, males (who have one X chromosome in each cell) experience more severe signs and symptoms of the disorder than females (who have two X chromosomes in each cell). A characteristic of X-linked inheritance is that fathers cannot pass X-linked traits to their sons.

Between 70 percent and 80 percent of people with Coffin-Lowry syndrome have no history of the condition in their families. These cases are caused by new mutations in the RPS6KA3 gene. The remaining 20 percent to 30 percent of affected individuals have other family members with Coffin-Lowry syndrome.

5. Other Names for This Condition

CLS
Mental retardation with osteocartilaginous abnormalities

References

Hanauer A, Young ID. Coffin-Lowry syndrome: clinical and molecular features. JMed Genet. 2002 Oct;39(10):705-13. Review.
Herrera-Soto JA, Santiago-Cornier A, Segal LS, Ramirez N, Tamai J. Themusculoskeletal manifestations of the Coffin-Lowry syndrome. J Pediatr Orthop.2007 Jan-Feb;27(1):85-9.
Hunter AG. Coffin-Lowry syndrome: a 20-year follow-up and review of long-term outcomes. Am J Med Genet. 2002 Sep 1;111(4):345-55. Review.
Nishimoto HK, Ha K, Jones JR, Dwivedi A, Cho HM, Layman LC, Kim HG. Thehistorical Coffin-Lowry syndrome family revisited: identification of two novelmutations of RPS6KA3 in three male patients. Am J Med Genet A. 2014Sep;164A(9):2172-9. doi: 10.1002/ajmg.a.36488.
Rogers RC, Abidi FE. Coffin-Lowry Syndrome. 2002 Jul 16 [updated 2018 Feb 1]. In: Adam MP, Ardinger HH, Pagon RA, Wallace SE, Bean LJH, Stephens K, Amemiya A, editors. GeneReviews® [Internet]. Seattle (WA): University of Washington,Seattle; 1993-2020. Available from http://www.ncbi.nlm.nih.gov/books/NBK1346/
Rojnueangnit K, Jones JR, Basehore MJ, Robin NH. Classic phenotype ofCoffin-Lowry syndrome in a female with stimulus-induced drop episodes and agenotype with preserved N-terminal kinase domain. Am J Med Genet A. 2014Feb;164A(2):516-21. doi: 10.1002/ajmg.a.36299.
Stephenson JB, Hoffman MC, Russell AJ, Falconer J, Beach RC, Tolmie JL,McWilliam RC, Zuberi SM. The movement disorders of Coffin-Lowry syndrome. BrainDev. 2005 Mar;27(2):108-13.

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Subjects: Genetics & Heredity

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Nicole Yin

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Entry Collection: MedlinePlus

Update Date: 24 Dec 2020

Table of Contents

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1. Introduction

2. Frequency

3. Causes

4. Inheritance

5. Other Names for This Condition

References

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1. Introduction

2. Frequency

3. Causes

3.1. The Gene Associated with Coffin-Lowry Syndrome

4. Inheritance

5. Other Names for This Condition

References