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Xia–Gibbs syndrome

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Xia-Gibbs syndrome
Other namesAHDC1-related intellectual disability-obstructive sleep apnea-mild dysmorphism syndrome[1][2]

Xia-Gibbs Syndrome,[3][4] is a newly discovered genetic disorder caused by a heterozygous mutation in the AHDC1 gene[5] (AT hook, DNA binding motif, containing 1) on chromosome 1p36 .

32 Cases worldwide to this date (January 11, 2017) have been diagnosed.

Signs and symptoms

Xia-Gibbs Syndrome is associated with symptoms including global developmental delay, hypotonia, obstructive sleep apnea, seizures, retrocerebellar cyst, delayed myelination, thinned corpus callosum, cutis aplasia, cortical visual impairment, micrognathia and mild dysmorphic features.

Diagnosis

Diagnosis requires diagnosis by whole-exome sequencing done by a genetic specialist.

History

In 2014 a human genetic disorder (Xia-Gibbs Syndrome) caused by de novo mutations in AHDC1 was discovered through whole-exome sequencing by Fan Xia, Richard A. Gibbs et al.[6] Four patients were identified in the paper which recorded the initial discovery and their clinical features were reported, including global developmental delay, hypotonia, obstructive sleep apnea, intellectual disability and seizures. The publication of the paper and discovery of the new condition was reported in the media including in Science Daily and in Baylor College of Medicine News.[7][8][9] Subsequent research has identified and reported the clinical features of an additional seven patients and there are now known to be twenty confirmed cases.[10]

References

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