Donnai-Barrow syndrome: Overview

Donnai-Barrow syndrome is an inherited disorder that affects many parts of the body. This disorder is characterized by unusual facial features, including prominent, wide-set eyes with outer corners that point downward; a short bulbous nose with a flat nasal bridge; ears that are rotated backward; and a widow's peak hairline.

Individuals with Donnai-Barrow syndrome have severe hearing loss caused by abnormalities of the inner ear (sensorineural hearing loss). In addition, they often experience vision problems, including extreme nearsightedness (high myopia), detachment or deterioration of the light-sensitive tissue in the back of the eye (the retina), and progressive vision loss. Some have a gap or split in the colored part of the eye (iris coloboma).

In almost all people with Donnai-Barrow syndrome, the tissue connecting the left and right halves of the brain (corpus callosum) is underdeveloped or absent. Affected individuals may also have other structural abnormalities of the brain. They generally have mild to moderate intellectual disability and developmental delay.

People with Donnai-Barrow syndrome may also have a hole in the muscle that separates the abdomen from the chest cavity (the diaphragm), which is called a congenital diaphragmatic hernia. This potentially serious birth defect allows the stomach and intestines to move into the chest and possibly crowd the developing heart and lungs. An opening in the wall of the abdomen (an omphalocele) that allows the abdominal organs to protrude through the navel may also occur in affected individuals. Occasionally people with Donnai-Barrow syndrome have abnormalities of the intestine, heart, or other organs.

Source: GHR (NLM/NIH)1

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Summary

Donnai Barrow syndrome is an inherited disorder that affects many parts of the body. People with this condition generally have characteristic facial features, severe sensorineural hearing loss, vision problems and an absent or underdeveloped corpus callosum (the tissue connecting the left and right halves of the brain). Other features may include diaphragmatic hernia, omphalocele, and/or other abnormalities of the intestine or heart. Affected people often have mild to moderate intellectual disability and developmental delay. Donnai Barrow syndrome is caused by changes (mutations) in the LRP2 gene and is inherited in an autosomal recessive manner. Treatment of this condition is based on the signs and symptoms present in each person but may include hearing aids and/or cochlear implants for hearing loss, corrective lenses for vision problems and surgery for certain physical abnormalities.[1] Last updated: 11/5/2014

Source: GARD (NIH)2

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Donnai-Barrow syndrome: An autosomal recessive disease characterized by facial and ocular abnormalities, sensorineural hearing loss, agenesis of the corpus callosum, variable intellectual disability, and proteinuria that has material basis in homozygous or compound heterozygous mutation in the LRP2 gene on chromosome 2q31.3

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Donnai-Barrow syndrome (DBS) is a rare, often severe, multiple congenital malformation syndrome with typical facial dysmorphism, ocular findings, hearing loss, agenesis of the corpus callosum, and variable intellectual disability. Congenital diaphragmatic hernia (CDH) and/or omphalocele are common (see these terms).4

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References

  1. Source: GHR (NLM/NIH): ghr.nlm.nih.gov/ condition/ donnai-barrow-syndrome
  2. Source: GARD (NIH): rarediseases.info.nih.gov/ diseases/ 1899/ donnai-barrow-syndrome
  3. Source: Disease Ontology
  4. Source: Monarch Initiative

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Note: This site is for informational purposes only and is not medical advice. See your doctor or other qualified medical professional for all your medical needs.