A germline mutation of the KIF1B beta gene on 1p36 in a family with neural and nonneural tumors.

Human Genetics
I-Tien YehPatricia L M Dahia

Abstract

Recently, the KIF1B beta gene on 1p36, a region commonly deleted in neural crest cancers, was found to be a proapoptotic factor for sympathetic precursors. KIF1B beta mutations were detected in pheochromocytomas and neuroblastomas, two sympathetic lineage tumors, suggesting a role for this gene in cancer. Here, we studied five individuals from a three-generation cancer-prone family with a KIF1B beta germline variant and seven of their tumors, both of neural crest and nonneural origin. Genetic studies including sequencing, copy number analysis and fluorescence in situ-hybridization (FISH) showed retention of both KIF1B beta alleles in all neural crest-derived tumors in this family, consistent with haploinsufficiency or methylation of the wild-type allele. In contrast, the lung adenocarcinoma from one mutation carrier had somatic loss of the wild-type allele in agreement with a classical two-hit inactivation. Global transcription analysis of KIF1B beta mutant pheochromocytomas revealed that these tumors are transcriptionally related to pheochromocytomas with RET and NF1 mutations but independent from SDH- and VHL-associated tumors. Furthermore, KIF1B beta-mutant tumors are uniquely enriched for pathways related to glutamate metab...Continue Reading

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