Prevalence of SHOX haploinsufficiency among short statured children.

BACKGROUND

The aim of this clinical study was to determine the prevalence of SHOX haploinsufficiency in a population of short stature patients and describe their anthropometric measurements.

METHODS

574 short statured patients were evaluated in a single center (1992-2015). SHOX copy number was detected by quantitative polymerase chain reaction (qPCR) in 574 subjects, followed by multiplex ligation-dependent probe amplification (MLPA) and DNA sequencing in subjects with SHOX haploinsufficiency. We evaluated anthropometric measurements at birth, and at first examination. Skeletal abnormalities were recorded for patients with SHOX haploinsufficiency.

RESULTS

Thirty-two patients were excluded due to Turner syndrome (n = 28), SRY-positive 46,XX male karyotype (n = 1), or lacked clinical follow-up information (n = 3). The prevalence of SHOX haploinsufficiency was 9 out of 542 (1.7%). The nine children had decreased height -2.85 (0.6) SD scores (SDS) (mean (SD)) and weight -2.15 (1.36) SDS, P < 0.001 and P = 0.001, respectively. The sitting height/height ratio was increased, P = 0.04. Madelung deformity was diagnosed in three patients. Mean height was -2.9 (0.4) SDS at baseline and increased by 0.25 (0.2) SDS, P = 0.046, after 1 y of growth hormone (GH) treatment.

CONCLUSION

The prevalence of SHOX haploinsufficiency was 1.7%. The clinical findings indicating SHOX haploinsufficiency among the nine children were disproportionate short stature and forearm anomalies.