[Identification of a missense mutation in SEDL gene from a Chinese family with X-linked spondyloepiphyseal dysplasia tarda].
OBJECTIVE
To identify the SEDL gene mutation in a Chinese family with X-linked spondyloepiphyseal dysplasia tarda (SEDL) and to establish a genotyping assay for rapid diagnosis of this X-linked recessive disorder.


METHODS
Clinical diagnoses were made based on physical examination, radiological examination and pedigree analysis for this family. Four primer pairs flanking the SEDL exons 3-6 including their exon/intron boundaries were designed. A rapid genotyping assay based on denaturing high performance liquid chromatography (DHPLC) was established to screen the point mutations of the SEDL gene. Genomic DNA was extracted by standard methods from 18 members in the three generations of the pedigree and subjected to PCR-denaturing high performance liquid chromatography (PCR-DHPLC) assay followed by direct DNA sequencing.


RESULTS
A c.218C>T mutation in exon 4 of the SEDL gene, which resulted in a substitution of serine 218 with leucine, was identified in this family. Among the 18 members, 3 patients, 5 obligate female carriers and 2 unmarried young females were found to have the missense mutation, and other 8 healthy individuals were not detected to carry the mutation, in which genotype-phenotype correlations were well established in each member investigated in this family.


CONCLUSIONS
A c.218C>T missense mutation in the SEDL gene was firstly reported in Chinese population and the results of this study expand the spectrum of SEDL mutations. The PCR-DHPLC assay is a useful tool to rapidly detect the SEDL mutation in clinical and prenatal diagnosis.
Zhou
Wan-jun
WJ
Department of Medical Genetics, Southern Medical University, Guangzhou, Guangdong, People's Republic of China.
Zhou
Shi-yuan
SY
Huang
Sheng-wen
SW
Zhou
Ji-ping
JP
Xu
Xiang-min
XM
D000293:Adolescent; D000328:Adult; D044466:Asian People / Q000235:genetics*; D001483:Base Sequence; D002648:Child; D002851:Chromatography, High Pressure Liquid; D004252:DNA Mutational Analysis; D005091:Exons / Q000235:genetics; D005190:Family; D005260:Female; D050172:Genes, X-Linked / Q000235:genetics*; D005838:Genotype; D006801:Humans; D008297:Male; D026901:Membrane Transport Proteins / Q000235:genetics*; D020125:Mutation, Missense; D010009:Osteochondrodysplasias / Q000175:diagnosis / Q000235:genetics*; D010375:Pedigree; D016133:Polymerase Chain Reaction; D014157:Transcription Factors / Q000235:genetics*
D026901:Membrane Transport Proteins; C120759:TRAPPC2 protein, human; D014157:Transcription Factors