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Human Molecular Genetics, Vol 5, 103-106, Copyright © 1996 by Oxford University Press

ARTICLES

A de novo case of hereditary neuropathy with liability to pressure palsies (HNPP) of maternal origin: a new mechanism for deletion in 17p11.2?

E LeGuern, R Gouider, N Ravise, J Lopes, S Tardieu, M Gugenheim, N Abbas, P Bouche, Y Agid and A Brice
INSERM U289, Hopital de la Salpetriere, Paris, France.

Hereditary neuropathy with liability to pressure palsies (HNPP) is an autosomal dominant neuropathy, most often associated with a deletion of the 17p11.2 region, which is duplicated in 70% of patients with Charcot- Marie-Tooth type 1 (CMT1A). Most de novo CMT1A and HNPP cases have been of paternal origin. A rare case of de novo HNPP of maternal origin was analysed to determine the underlying mechanism. Affected individuals in the family carried a deletion corresponding to the CMT1A/HNPP monomer unit associated with a rearrangement of the CMT1A-REP sequences. Segregation analysis of 17p11-p12 markers in the family indicated that the deletion was not generated by unequal crossing over between homologous 17 chromosomes, as in de novo cases from paternal origin, but rather by an intrachromosomal rearrangement. Two distinct mechanisms can therefore lead to the same 17p11.2 deletion. This result suggests that intrachromosomal rearrangement may be specific to maternal transmissions.
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