Title:Chromosome 9 Inversion: Pathogenic or Benign? A Comprehensive Systematic Review of all Clinical Reports
Volume: 22
Issue: 5
Author(s): Neda Mohsen-Pour, Taravat Talebi, Niloofar Naderi, Maryam Hosseini Moghadam, Majid Maleki and Samira Kalayinia*
Affiliation:
- Cardiogenetic Research Center, Rajaie Cardiovascular Medical and Research Center, Iran University of
Medical Sciences, Tehran, Iran
Keywords:
Breakpoint, inv(9), Karyotype, Pericentric inversion, Clinical findings, Reproductive disorders.
Abstract:
Background: Inversion of chromosome 9 (inv[9]) is known as one of the most
common structural balanced chromosomal variations. Chromosome 9 is highly
susceptible to structural rearrangements, specifically to pericentric inversions. Various
investigators have posited that inv(9) with different breakpoints could be the cause of
several abnormal conditions in individuals, whereas others have considered it a benign
variant. To our knowledge, a consensus regarding the effects of this inversion has yet to
emerge.
Objective: This study aims to discuss the pathogenic/benign effects of inv(9) in all
possible clinical conditions detected in the occurrence of this abnormality.
Methods: Studies on inv(9) were collected via PubMed, MalaCards, Google Scholar,
and NORD, along with the search terms of inv(9), pericentric inv(9), and chromosome 9
variants. Additionally, the incidence of inv(9) and the karyotype and clinical findings of
individuals reported with this variant were investigated.
Results: The collection of the studies reviewed shows that inv(9) is associated with
various conditions such as congenital anomalies, growth retardation, infertility, recurrent
pregnancy loss, and cancer. The clinical features associated with this variant in humans
vary between growth stages. Further, there have been no shared clinical findings in a
specific period.
Conclusion: Although there is no conclusive evidence for the pathogenicity of this
rearrangement, prenatal genetic counseling on inv(9) and further clinical and molecular
studies would be helpful in chromosome 9-related problems.