[Two cases of rare diseases with abnormalities of X chromosome].

OBJECTIVE

To explore the clinical features and genetic diagnosis of two cases with rare diseases and X chromosome abnormalities.

METHODS

Multiple ligation-dependent probe amplification (MLPA) and karyotype analysis were carried out on an 8-year-old girl who was diagnosed with Duchenne muscular dystrophy. Karyotype analysis and PCR assay for SRY and AZF genes were carried out for a-2-month-old male infant with short penis.

RESULTS

The girl, who featured short stature and cubitus valgus, was diagnosed as Turner syndrome with a karyotype of 46,X,i(Xq). The male infant was detected with a karyotype of 45,X, with presence of SRY gene but absence of AZF gene.

CONCLUSION

Both cases may be associated with abnormalities of X chromosome. Genetic testing can facilitate early diagnosis and clinical intervention for such patients.