germline smarce1 mutations predispose to both spinal and cranial clear cell meningiomas
TRANSCRIPT
4 MJ Smith et al
A
B C D
Figure 2. MLPA-based determination of SMARCE1 copy number. (A) Schematic diagram of the human SMARCE1 gene (NM_003979): exonsare depicted as vertical bars; arrows denote the target sites of MLPA probes; ex, exon; in, intron; prom, promoter; 3′ UTR, 3′ untranslatedregion. (B) Exemplary negative MLPA findings and finding on a sample carrying a known nucleotide substitution: boxes visualize maximum,median and minimum values for eight samples found to not have altered SMARCE1 copy number; values for a positive control sample, whichcarries a single nucleotide substitution at the ligation site for the exon 5 MLPA probes, are depicted by open circles; stippled horizontallines mark the 0.7–1.3 range, outside of which signals are considered aberrant. (C) Large deletion with loss of the wild-type allele in atumour sample for which no corresponding germline DNA was available. (D) Large deletion in a family, including germline DNA from theproband and one affected sister, tumour DNA from a second affected sister and germline DNA from her unaffected parents.
Figure 3. Pedigrees of confirmed germline SMARCE1 mutation carriers: black stripe, unaffected mutation carrier; ?, uncertain whetheraffected.
with SMARCE1 loss was from a patient with a clin-ical diagnosis of NF2, with multiple schwannomasand meningiomas but no germline NF2 mutation. NoSMARCE1 mutation was identified in germline DNA,indicating that the observed protein loss in tumour isprobably due to a somatic mutation, although analysisof tumour DNA was not possible. No other tumoursfrom this patient were available for analysis. The tworemaining SMARCE1 protein-negative meningiomaswere single tumours and no DNA was available formutation testing.
Overall, we identified seven novel SMARCE1 muta-tions in clear cell meningioma patients, three of whichwere confirmed in the germline (Table 1). Four of thesewere identified in individuals with spinal menigniomas.However, the other three individuals had cranial menin-giomas.
One of three female siblings with spinal clear cellmeningiomas, who inherited a large deletion from theirunaffected father, also developed a cranial meningioma.An unrelated female developed a cranial meningiomaat the age of 14 years. Her mother is now also knownto have asymptomatic cranial meningiomas on MRIscan. The proband’s brother also carries the mutation,although he remains clinically unaffected at 17 years ofage. One mutation was found in the cranial tumour ofa 10 year-old boy with an affected uncle, presumed tohave NF2 disease, although no germline NF2 mutationwas identified. No lymphocyte DNA was available forSMARCE1 analysis; therefore the germline status of thismutation remains uncertain.
All SMARCE1 mutation-positive males in this studydeveloped tumours between the ages of 2 and 10 years,with the exception of the two clinically unaffected
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Copyright © 2014 Pathological Society of Great Britain and Ireland. J Pathol 2014; 0: 000–000Published by John Wiley & Sons, Ltd. www.pathsoc.org.uk www.thejournalofpathology.com
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