TRPS1 gene alterations in human subependymoma.

Area of Science:

• Neuro-oncology
• Human Genetics
• Molecular Biology

Background:

• Subependymoma is a rare primary brain tumor with largely unknown genetic underpinnings.
• Familial occurrences of subependymoma suggest a potential genetic predisposition.
• Trichorhinophalangeal syndrome type 1 (TRPS1) is a rare hereditary disorder linked to mutations in the TRPS1 gene.

Observation:

• Two patients with TRPS1 and surgically treated subependymomas were identified.
• One patient had a family history of subependymoma, suggesting a hereditary component.
• Tumor and saliva samples were analyzed for genetic alterations in the TRPS1 gene.

Findings:

• A heterozygous germline TRPS1 mutation was identified in one patient, present in both germline and tumor tissue.
• The second patient's tumor exhibited copy number neutral loss of heterozygosity in TRPS1.
• Genetic alterations, primarily loss-of-function, were found in one-third of sporadic subependymoma samples, implicating TRPS1.

Implications:

• The TRPS1 gene likely plays a role in the molecular oncogenesis of a subgroup of subependymomas.
• These findings open avenues for further investigation into the genetic basis of subependymoma.
• Future research should focus on (epi)genetic investigations in fresh-frozen tumor samples to confirm these results.