A number sign (#) is used with this entry because of evidence that Antley-Bixler syndrome with disordered steroidogenesis (ABS1) is caused by homozygous or. Antley–Bixler syndrome, also called trapezoidocephaly-synostosis syndrome, is a rare, very severe autosomal recessive congenital disorder characterized by. This page from Great Ormond Street Hospital (GOSH) explains the causes, symptoms and treatment of Antley-Bixler syndrome and where to get help.

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Description of two new cases and a review of the literature.

D ICD – Spinal anomalies may also be present. Abnormalities, Multiple, genetics,radiography,Case Report, Contracture, genetics,radiography,Craniosynostoses, genetics,radiography,Human, Infant, Male, Marfan Syndrome, genetics,radiography,Syndrome, Synostosis, genetics,radiography. Antley—Bixler syndrome presents itself at birth or prenatally. Chitayat D, et al. Early intervention may be important in ensuring that affected children reach their potential.

Rare Disease Database

There is a wide spectrum of anomalies seen in ABS; other features include midface hypoplasia, choanal stenosis or atresia, multiple joint contractures, visceral anomalies particularly of the genitourinary systemand impaired steroidogenesis present only in patients with POR mutations.

As a result, the head may appear abnormally short and broad brachycephalic and when viewed from above appears like a trapezoid. This disorder is also known as Acrocephalopolysyndactyly Type II.

According to researchers, genetic mutations that disrupt the functioning of such proteins may result in certain abnormalities during embryonic development, such as malformations of the craniofacial area and the limbs. Eur J Pediatr ; This page was last edited on 10 Novemberat Bbixler grossly dysmorphic embryonic lethal phenotype of POR knockout mice, with neural tube, cardiac, eye, and limb anomalies, suggests that severe bixlerr of POR may be sufficient to account for the skeletal findings in some individuals with an ABS phenotype Shen et al.


By contrast, milder mutations in POR may manifest as mild disorders of steroid synthesis. Alone we are rare.

Antley–Bixler syndrome – Wikipedia

Clinical Synopsis Toggle Dropdown. Prognosis The prognosis is poor with the majority of reported patients dying during infancy due to respiratory complications.

Together we are strong. Some individuals with Antley-Bixler Syndrome may have additional physical abnormalities.

Antley Bixler Syndrome – NORD (National Organization for Rare Disorders)

Ultrasound studies may reveal characteristic findings that may be associated with the disorder. J Pediatr Orthop B. A high ratio of metabolites of the primary adrenal steroid precursors pregnenolone and progesterone to cortisol metabolites was the most characteristic feature for diagnosis. Other treatment is symptomatic and supportive.

Specialized testing, such as certain advanced imaging techniques, may also antlry conducted to detect certain findings that may be associated with the disorder. However, according to researchers, other cases may result from spontaneous sporadic genetic changes mutations that may be transmitted as an autosomal dominant trait.

The 34 affected POR alleles included 10 with alato-pro Goodman Syndrome is a rare inherited disorder of infancy characterized by abnormalities of the head, hands, and genitals. Eleven pairs of ribs instead of the usual twelve may also be present.

Antley–Bixler syndrome

Musculoskeletal manifestations of the Antley-Bixler syndroome. Infants with Pfeiffer Syndrome usually have a short, pointed head acrobrachycephaly and other deformities of the face, jaws, and teeth. About News Events Contact. Pairs of human chromosomes are numbered from 1 through 22, with an unequal 23rd pair of X and Y chromosomes for males and two X chromosomes for females.

Antich J, et al. Bottero L, bixper al. Children present with characteristic facial features, including a large domed forehead, flat nose, and midface hypoplasia with proptosis and dysplastic ears. Antley-Bixler syndrome in sisters: Antley-Bixler syndrome from a prognostic perspective: In such cases, without prompt, appropriate treatment, potentially life-threatening complications may result. Am J Med Genet. Fifty percent of their children anttley being carriers of the disease but generally will not show symptoms of the disorder.


Since the disorder was originally described inmore than 20 cases have been discussed in the literature. The specific underlying cause of Antley-Bixler Syndrome remains unclear. Primary Craniosynostosis is a rare disorder of the skull that may be inherited as an autosomal dominant or autosomal recessive genetic trait. Comparisons may be useful for a differential diagnosis: In recessive disorders, if both parents carry the same gene for the same disease trait, there is an increased risk that their children may inherit the two genes necessary for development bisler the disease.

Aromatase deficiency Aromatase excess syndrome.

Evidence for digenic inheritance in some cases of Antley-Bixler syndrome? Mutations found in the FGFR2 gene have been shown to cause synostosis and other formal skeletal, polydactylic and syndactylic abnormalities found in Antley—Bixler and similar disorders. There are two distinct genetic mutations associated with the Antley—Bixler syndrome phenotype synrdome, which suggests the disorder may be genetically heterogeneous.

Research on birth defects and their causes is ongoing. Musculoskeletal manifestations of the Antley-Bixler syndrome.

Affected Populations According to cases reported in the medical literature, Antley-Bixler Syndrome has appeared to affect females more often than males.