Phenotypic variations in X chromosome mutations: Two case reports.

Area of Science:

• Genetics
• Endocrinology
• Reproductive Health

Background:

• Turner syndrome (TS), often caused by Monosomy X, classically presents with hypoestrogenemia and short stature.
• Genetic variations in the X chromosome can lead to diverse clinical manifestations.
• Accurate diagnosis is essential for appropriate patient management and treatment.

Observation:

• Two adolescent females presented with primary amenorrhea but atypical phenotypes.
• Patient 1 exhibited cognitive delay and tall stature with an isodicentric X chromosome [46, X, idic(X)(q21)].
• Patient 2 had normal intelligence and average stature with a partial X chromosome deletion [46, X, del(X)(q13.3)].

Findings:

• Neither patient displayed the characteristic short stature associated with TS.
• Both patients required estrogen therapy to induce secondary sexual characteristics and support bone health.
• Partial X deletions present unique phenotypes distinct from classic TS.

Implications:

• Advances in genetic diagnostics allow for more precise identification of X chromosome abnormalities.
• These findings challenge the traditional TS phenotype and necessitate revised diagnostic criteria.
• Personalized treatment strategies, including hormone replacement, are vital for patients with atypical X chromosome variations.