A 1.5 Mb submicroscopic deletion in 17p11.2-p12 is frequently observed in Italian families with hereditary neuropathy with liability to pressure palsies
- Baylor College of Medicine, Houston, TX (United States); and others
Hereditary neuropathy with liability to pressure palsies (HNPP) is an autosomal dominant disorder characterized by recurrent mononeuropathies that was recently associated with a 1.5 Mb deletion in chromosome 17p11.2-p12. Duplication of the same region is known to be associated with Charcot-Marie-Tooth disease type 1A (CMT1A), a more severe peripheral neuropathy characterized by symmetrically slowed nerve conduction velocity. The CMT1A duplication and HNPP deletion are reciprocal recombination products involving a repeat element (CMT1A-REP) which flanks the 1.5 Mb region involved in the duplication/deletion. Patients from 9 unrelated HNPP Italian families were clinically, electrophysiologically and histologically evaluated. Families were typed with a polymorphic (CA){sub n} repeat and with RFLPs corresponding to loci D17S122, D17S125 and D17S61, which all map within the deleted region. Lack of allelic transmission from affected parent to affected offspring was observed in four informative families, suggesting the presence of deletion. Southern blot analysis of EcoRI digested genomic DNA from HNPP patients and control subjects was performed using a probe mapping within the CMT1A-REP elements. A reduced hybridization signal of a 6.0 kb EcoRI fragment, mapping within the distal CMT1A-REP, was observed in all HNPP patients suggesting the loss of one copy of this fragment in the HNPP-deleted chromosome. PFGE analysis of SacII digested genomic DNA from selected HNPP subjects showed the presence of a junction fragment which has previously been found in association with the 1.5 Mb HNPP deletion. Evidence for deletion could be demonstrated in all 9 families suggesting that the 17p11.2-p12 deletion is commonly associated with HNPP.
- OSTI ID:
- 134254
- Report Number(s):
- CONF-941009-; ISSN 0002-9297; TRN: 95:005313-0990
- Journal Information:
- American Journal of Human Genetics, Vol. 55, Issue Suppl.3; Conference: 44. annual meeting of the American Society of Human Genetics, Montreal (Canada), 18-22 Oct 1994; Other Information: PBD: Sep 1994
- Country of Publication:
- United States
- Language:
- English
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