Cryptic intragenic deletion of the SHOX gene in a family with Léri-Weill dyschondrosteosis detected by Multiplex Ligation-Dependent Probe Amplification (MLPA).
LWD is associated to SHOX haploinsufficiency, in most cases, due to gene deletion. Generally FISH and microsatellite analysis are used to identify SHOX deletion. MLPA is a new method of detecting gene copy variation, allowing simultaneous analysis of several regions. Here we describe the presence of a SHOX intragenic deletion in a family with LWD, analyzed through different methodologies. Genomic DNA of 11 subjects from one family were studied by microsatellite analysis, direct sequencing and MLPA. FISH was performed in two affected individuals. Microsatellite analysis showed that all affected members shared the same haplotype suggesting the involvement of SHOX. MLPA detected an intragenic deletion involving exons IV-VIa, which was not detected by FISH and microsatellite analysis. In conclusion, the MLPA technique was proved to be the best solution on detecting this small deletion, it has the advantage of being less laborious also allowing the analysis of several regions simultaneously.
Funari
Mariana F A
MF
Hospital das Clínicas, Universidade de São Paulo, SP, Brasil.
Jorge
Alexander A L
AA
Pinto
Emilia M
EM
Arnhold
Ivo J P
IJ
Mendonca
Berenice B
BB
Nishi
Mirian Y
MY
D016022:Case-Control Studies; D002648:Child; D015342:DNA Probes / Q000235:genetics*; D005260:Female; D017353:Gene Deletion; D018398:Homeodomain Proteins / Q000235:genetics*; D006801:Humans; D008297:Male; D018895:Microsatellite Repeats; D021141:Nucleic Acid Amplification Techniques / Q000379:methods*; D010009:Osteochondrodysplasias / Q000235:genetics*; D010375:Pedigree; D017422:Sequence Analysis, DNA / Q000379:methods; D000074122:Short Stature Homeobox Protein
D015342:DNA Probes; D018398:Homeodomain Proteins; C106071:SHOX protein, human; D000074122:Short Stature Homeobox Protein