Rapid detection of 17p11.2 rearrangements by FISH without cell culture (direct FISH, DFISH): A prospective study of 130 patients with inherited peripheral neuropathies
Identifieur interne : 000055 ( Istex/Curation ); précédent : 000054; suivant : 000056Rapid detection of 17p11.2 rearrangements by FISH without cell culture (direct FISH, DFISH): A prospective study of 130 patients with inherited peripheral neuropathies
Auteurs : Nicole Ravisé [France] ; Odile Dubourg [France] ; Sandrine Tardieu [France] ; Françoise Aurias [France] ; Monique Mercadiel [France] ; Philippe Coullin [France] ; Merle Ruberg [France] ; Martin Catala [France] ; Sylvie Lesourd [France] ; Alexis Brice [France] ; Eric Leguern [France]Source :
- American Journal of Medical Genetics Part A [ 1552-4825 ] ; 2003-04-01.
English descriptors
- Teeft :
- Blot, Brice, Cell culture, Chromosome, Classical fish, Cmt1a, Deletion, Dfish, Direct fish, Disease type, Duplication, Fish signals, Genet, Grant sponsor, Hereditary, Hereditary neuropathy, Hnpp, Hnpp patients, Hopital pitie, Hybridization, Hypotonic shock, Interphase, Interphase nuclei, Lupski, Neuropathy, Palsy, Pressure palsies, Prins, Probes hybridized, Prospective study, Rapid detection, Rearrangement, Sensory neuropathies, Shaffer, Southern blot, Southern blot experiments, Southern blots.
Abstract
Charcot‐Marie‐Tooth (CMT) disease and hereditary neuropathy with pressure palsies (HNPP) are two frequent hereditary motor and sensory neuropathies. CMT is characterized by slowly progressive weakness and atrophy, primarily in peroneal and distal leg muscles. The most frequent form, CMT1A, is due, in most cases, to the duplication of a 1.5 Mb region on chromosome 17p11.2 containing the peripheral myelin protein 22 gene (PMP22). The phenotype seems to result from dosage of the PMP22 gene. This hypothesis is reinforced by the existence of HNPP, which is clinically characterized by various recurrent truncular palsies or sensory loss precipitated by minor trauma, which is caused by deletion of the same 1.5 Mb region in 17p11.2. In clinical practice, the detection of the duplication or the deletion in 17p11.2, which permits a positive diagnosis, is still performed by time consuming methods (Southern blot or various combinations of molecular tools). We developed a method for the rapid detection of 17p11.2 rearrangements, using “direct FISH” and PRINS analyses, which does not require cell culture. In a prospective study of 92 patients with CMT and 38 with suspected HNPP, we compared this new technique to classical strategies like Southern blot. The results demonstrate the high sensitivity and specificity of the new FISH technique for the diagnosis of CMT1A and HNPP. Moreover, because of its simplicity and rapidity, this technique provides a useful alternative to the molecular approaches that have been used to diagnose segmental aneusomies, especially in the case of duplications that often go undetected. © 2003 Wiley‐Liss, Inc.
Url:
DOI: 10.1002/ajmg.a.10190
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<term>Brice</term>
<term>Cell culture</term>
<term>Chromosome</term>
<term>Classical fish</term>
<term>Cmt1a</term>
<term>Deletion</term>
<term>Dfish</term>
<term>Direct fish</term>
<term>Disease type</term>
<term>Duplication</term>
<term>Fish signals</term>
<term>Genet</term>
<term>Grant sponsor</term>
<term>Hereditary</term>
<term>Hereditary neuropathy</term>
<term>Hnpp</term>
<term>Hnpp patients</term>
<term>Hopital pitie</term>
<term>Hybridization</term>
<term>Hypotonic shock</term>
<term>Interphase</term>
<term>Interphase nuclei</term>
<term>Lupski</term>
<term>Neuropathy</term>
<term>Palsy</term>
<term>Pressure palsies</term>
<term>Prins</term>
<term>Probes hybridized</term>
<term>Prospective study</term>
<term>Rapid detection</term>
<term>Rearrangement</term>
<term>Sensory neuropathies</term>
<term>Shaffer</term>
<term>Southern blot</term>
<term>Southern blot experiments</term>
<term>Southern blots</term>
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<front><div type="abstract" xml:lang="en">Charcot‐Marie‐Tooth (CMT) disease and hereditary neuropathy with pressure palsies (HNPP) are two frequent hereditary motor and sensory neuropathies. CMT is characterized by slowly progressive weakness and atrophy, primarily in peroneal and distal leg muscles. The most frequent form, CMT1A, is due, in most cases, to the duplication of a 1.5 Mb region on chromosome 17p11.2 containing the peripheral myelin protein 22 gene (PMP22). The phenotype seems to result from dosage of the PMP22 gene. This hypothesis is reinforced by the existence of HNPP, which is clinically characterized by various recurrent truncular palsies or sensory loss precipitated by minor trauma, which is caused by deletion of the same 1.5 Mb region in 17p11.2. In clinical practice, the detection of the duplication or the deletion in 17p11.2, which permits a positive diagnosis, is still performed by time consuming methods (Southern blot or various combinations of molecular tools). We developed a method for the rapid detection of 17p11.2 rearrangements, using “direct FISH” and PRINS analyses, which does not require cell culture. In a prospective study of 92 patients with CMT and 38 with suspected HNPP, we compared this new technique to classical strategies like Southern blot. The results demonstrate the high sensitivity and specificity of the new FISH technique for the diagnosis of CMT1A and HNPP. Moreover, because of its simplicity and rapidity, this technique provides a useful alternative to the molecular approaches that have been used to diagnose segmental aneusomies, especially in the case of duplications that often go undetected. © 2003 Wiley‐Liss, Inc.</div>
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