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Constitutional DNA-level aberrations in chromosome 22 in a patient with multiple meningiomas
R H LeKanne Deprez1, N A Groen, D Louz
1Department of Pathology, Erasmus University, Rotterdam, The Netherlands.
Abstract:
We describe a patient who developed multiple meningiomas but had no clear evidence of neurofibromatosis type 2. Four of the tumors, derived from three different sites, were analyzed cytogenetically and/or at the DNA level using chromosome 22 specific probes. All four tumors showed loss of the same copy of chromosome 22. On the chromosome that was retained in the tumors, we found two constitutional aberrations, a 1.5 kb deletion and a point mutation. The patient had inherited both alterations from her father. The father has not developed any meningiomas so far but he has been treated for a well-differentiated adenocarcinoma of the lung and a brain metastasis from this tumor. The mother and 75 unrelated individuals did not show any of the chromosome 22 alterations. The multiple tumors found in the patient suggest that she has a predisposing gene for the development of meningiomas. The finding that all investigated tumors lost the same, constitutionally normal copy of chromosome 22 could indicate that the predisposing gene resides on chromosome 22 and was affected by the constitutional mutations.
Insights
This study identifies a potential genetic predisposition to multiple meningiomas. Constitutional chromosome 22 alterations in a patient suggest a novel tumor suppressor gene involved in meningioma development.
Area of Science:
- Genetics
- Oncology
- Neuroscience
Background:
- Multiple meningiomas are rare, often associated with neurofibromatosis type 2 (NF2).
- Genetic factors influencing meningioma development are not fully understood.
- Chromosome 22 is frequently implicated in meningioma pathogenesis.
Observation:
- A patient presented with multiple meningiomas without clear NF2 diagnosis.
- Tumor analysis revealed loss of a specific chromosome 22 copy in all meningiomas.
- The patient inherited constitutional deletions and point mutations on chromosome 22 from her father.
Findings:
- All analyzed meningiomas exhibited loss of the same chromosome 22 copy.
- The retained chromosome 22 in tumors carried constitutional aberrations (deletion and point mutation).
- These constitutional alterations were inherited from the patient's father, who has a history of lung adenocarcinoma.
Implications:
- The findings suggest a potential predisposing gene for meningiomas located on chromosome 22.
- Constitutional mutations on chromosome 22 may increase susceptibility to meningioma formation.
- This research could lead to new diagnostic markers and therapeutic targets for meningioma.