Opitz G/BBB syndrome

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Opitz G/BBB syndrome
Synonyms Opitz syndrome, G syndrome, BBB syndrome
Pronounce N/A
Specialty N/A
Symptoms Hypertelorism, cleft lip and palate, laryngeal cleft, hypospadias, genitourinary anomalies
Complications Respiratory distress, feeding difficulties, developmental delay
Onset Congenital
Duration Lifelong
Types N/A
Causes Genetic mutation in MID1 or SPECC1L genes
Risks Family history
Diagnosis Clinical evaluation, genetic testing
Differential diagnosis Noonan syndrome, CHARGE syndrome, VACTERL association
Prevention N/A
Treatment Surgical intervention, supportive care
Medication N/A
Prognosis Variable, depends on severity of symptoms
Frequency Rare, exact prevalence unknown
Deaths N/A


Opitz G/BBB syndrome is a genetic disorder characterized by several abnormalities along the midline of the body. The condition was first described by John Opitz, a geneticist, and hence, it bears his name. The syndrome is also known as Opitz-Frias syndrome or Opitz syndrome.

Symptoms and Signs[edit | edit source]

The symptoms of Opitz G/BBB syndrome can vary greatly among affected individuals. Common features include hypertelorism (widely spaced eyes), cleft lip or cleft palate, and abnormalities in the larynx, heart, and urinary system. Some individuals may also have intellectual disability or learning difficulties.

Causes[edit | edit source]

Opitz G/BBB syndrome is caused by mutations in the MID1 gene. This gene provides instructions for making a protein that is involved in the regulation of other proteins within the cell. Mutations in the MID1 gene disrupt this regulation, leading to the abnormalities seen in Opitz G/BBB syndrome.

Diagnosis[edit | edit source]

Diagnosis of Opitz G/BBB syndrome is based on the presence of characteristic signs and symptoms. Genetic testing can confirm the diagnosis by identifying a mutation in the MID1 gene.

Treatment[edit | edit source]

Treatment for Opitz G/BBB syndrome is symptomatic and supportive. It may include surgery to correct physical abnormalities, speech therapy for those with a cleft lip or palate, and educational support for those with learning difficulties.

Prognosis[edit | edit source]

The prognosis for individuals with Opitz G/BBB syndrome varies depending on the severity of symptoms. With appropriate treatment and support, many individuals with this condition lead healthy, productive lives.

See Also[edit | edit source]

References[edit | edit source]

  • Opitz JM, Frias JL, Gutenberger JE, Pellet JR. The G syndrome of multiple congenital anomalies. Birth Defects Orig Artic Ser. 1969;5(2):95-101.
  • Quaderi NA, Schweiger S, Gaudenz K, et al. Opitz G/BBB syndrome, a defect of midline development, is due to mutations in a new RING finger gene on Xp22. Nat Genet. 1997;17(3):285-291.
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