Chromosome 15q partial deletion

Chromosome 15q partial deletion is a rare human genetic disorder, caused by a chromosomal aberration in which the long ("q") arm of one copy of chromosome 15 is deleted, or partially deleted.[1] Like other chromosomal disorders, this increases the risk of birth defects, developmental delay and learning difficulties, however, the problems that can develop depend very much on what genetic material is missing. If the mother's copy of the chromosomal region 15q11-13 is deleted, Angelman syndrome (AS) can result. The sister syndrome Prader-Willi syndrome (PWS) can result if the father's copy of the chromosomal region 15q11-13 is deleted.[2] The smallest observed region that can result in these syndromes when deleted is therefore called the PWS/AS critical region. In addition to deletions, uniparental disomy of chromosome 15 also gives rise to the same genetic disorders, indicating that genomic imprinting must occur in this region.

Chromosome 15q partial deletion
Other namesPartial deletion of the long arm of chromosome 15
Chromosome 15
SpecialtyMedical genetics
SymptomsLearning difficulties and/or intellectual disability, usually mild or moderate, delayed speech and bad language skills.
ComplicationsPeople with this disorder have a higher risk of having epilepsy, since one third of children with this disorder have epilepsy.
Usual onsetBirth
DurationLife-long
CausesDeletion in long arm of chromosome 15
Frequency1 in 40,000 live births

Deletions of regions of chromosome 15 (notably regions 15q15 and 15q22) on several types of human tumours suggest the presence of a potential tumor suppressor gene.[3] This disorder occurs in approximately 1 in 40,000 live births [4]

See also

References

  1. "Chromosome15q deletion". nih.gov. Retrieved 2016-08-05.
  2. "15q deletion" (PDF). rarechromo.org. Archived from the original (PDF) on 2016-08-04. Retrieved 2016-08-05.
  3. Natrajan R, Louhelainen J, Williams S, Laye J, Knowles MA (2003). "High-resolution deletion mapping of 15q13.2-q21.1 in transitional cell carcinoma of the bladder". Cancer Res. 63 (22): 7657–62. PMID 14633686.
  4. "15q13.3 microdeletion: MedlinePlus Genetics". medlineplus.gov. Retrieved 2022-02-25.


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