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  • Title: Voltage-gated calcium channel gamma 2 subunit gene is not deleted in velo-cardio-facial syndrome.
    Author: Black JL, Krahn LE, Jalal SM.
    Journal: Mol Psychiatry; 2001 Jul; 6(4):461-4. PubMed ID: 11443534.
    Abstract:
    Velo-cardio-facial syndrome (VCFS) has been associated with schizophrenic symptoms in some patients and is caused by a deletion of 22q11.21--q11.23. The voltage-gated calcium channel (VGCC) gamma 2 subunit is located on chromosome 22 and is telemeric to the most commonly observed VCFS deletion region but is near a putative marker for schizophrenia (D22S278). Metaphase spreads of four controls, four patients with VCFS, and one patient with VCFS and schizophrenia were evaluated for the VCFS deletion using the VCFS-diagnostic probe, TUPLE 1, and for deletion of VGCC gamma 2 subunit gene using probes for that gene's exon 1 and exons 3 and 4. All of the VCFS patients had deletion of the TUPLE 1 probe on one chromosome of the chromosome 22 pair. None showed deletion of the gamma 2 subunit exons studied. The location of the gamma 2 subunit gene at 22q13.1 was confirmed by FISH in all cases. This study did not show a deletion of the gamma 2 subunit gene as a distinguishing feature of our patient with VCFS and schizophrenia.
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