Trisomy 9

Not to be confused with Tetrasomy 9p.
Trisomy 9
Chromosome 9
SpecialtyMedical genetics Edit this on Wikidata
Causesthree copies of Chromosome 9
PrognosisInvariably fatal, no known effective treatment

Full trisomy 9 is a rare and fatal chromosomal disorder caused by having three copies (trisomy) of chromosome number 9. It can be a viable condition if the trisomic component affects only part of the cells of the body (mosaicism) or in cases of partial trisomy of the short arm (trisomy 9p) in which cells have a normal set of two entire chromosomes 9 plus part of a third copy of the short arm ("p") of the chromosome.

Presentation

Symptoms vary, but usually result in dysmorphisms in the skull, nervous system problems, and developmental delay. Dysmorphisms in the heart, kidneys, and musculoskeletal system may also occur. An infant with complete trisomy 9 surviving 20 days after birth showed clinical features including a small face, wide fontanelle, prominent occiput, micrognathia, low set ears, upslanting palpebral fissures, high-arched palate, short sternum, overlapping fingers, limited hip abduction, rocker bottom feet, heart murmurs and a webbed neck.[1]

Trisomy 9p is one of the most frequent autosomal anomalies compatible with long survival rate. A study of five cases showed an association with Coffin–Siris syndrome, as well as a wide gap between the first and second toes in all five, while three had brain malformations including dilated ventricles with hypogenesis of the corpus callosum and Dandy–Walker malformation.[2]

Diagnosis

Trisomy 9 can be detected prenatally with chorionic villus sampling and cordocentesis, and can be suggested by obstetric ultrasonography.[citation needed]

Because trisomy 9 may appear with mosaicism, it is suggested that doctors take samples from multiple tissues when karyotyping for diagnosis.[3]

References

  1. ^ Kannan, T. P.; Hemlatha, S.; Ankathil, R.; Zilfalil, B. A. (2009). "Clinical manifestations in trisomy 9". The Indian Journal of Pediatrics. 76 (7): 745–6. doi:10.1007/s12098-009-0158-2. PMID 19475342. S2CID 207385217.
  2. ^ Temtamy, SA; Kamel, AK; Ismail, S; Helmy, NA; Aglan, MS; El Gammal, M; El Ruby, M; Mohamed, AM (2007). "Phenotypic and cytogenetic spectrum of 9p trisomy". Genetic Counseling. 18 (1): 29–48. PMID 17515299.
  3. ^ Stipoljev, F.; Kos, M.; Kos, M.; Miskovi, B.; Matijevic, R.; Hafner, T.; Kurjak, A. (2003). "Antenatal detection of mosaic trisomy 9 by ultrasound: A case report and literature review". The Journal of Maternal-Fetal & Neonatal Medicine. 14 (1): 65–9. doi:10.1080/jmf.14.1.65.69. PMID 14563095. S2CID 24028391.

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