SCIENTIFIC BACKGROUND

monosomy X

Categories: ,

Scientific background

Turner syndrome is one of the most common chromosomal disorders with an incidence of 1:2,500 in female newborns and an estimated 1:100 conceptions (98% of these pregnancies end in miscarriage in the 1st trimester). Prenatal ultrasound may reveal early hygroma colli or hydrops fetalis which often leads to invasive prenatal screening and detection of the chromosomal disorder. The clinical manifestations are short stature (approximately 150 cm), primary amenorrhea, streak gonads, a webbed neck and slight facial dysmorphic signs such as outwardly sloping eyelids. Intelligence is within the normal range. Prenatally, dilatation of the lymphatic vessels with lymphedema and cystic hygroma is common. Hormone treatment is necessary for the development of secondary sexual characteristics. Although there is no growth hormone deficiency, growth in many patients can be improved by supplementary growth hormone therapy. Where there is 45,X/46,XY mosaicism, sonographic monitoring of the gonads is recommended due to an increased risk of gonadoblastoma. Noonan syndrome should be considered as the primary differential diagnosis.

 

In about 55% of patients, a complete monosomy X is present, whereas in the remaining patients, there are gonosomal mosaics or X-linked structural anomalies.

 

References

Boucher et al. 2001, J Med Genet 38:591 / Ogata et al. 2001, J Med Genet 38:1 / Wieacker 2001, Medgen 13:3 / Tarani et al. 1998, Gynecol Endocrinol 12:83 / Swillen et al. 1993, Genet Counsel 4:7

GENES

monosomy X
How to order

LATEST ARTICLES

A recent study tracked molecular changes in 108 people over time, revealing that aging involves critical shifts around ages 44 and 60. These changes ...

Read more

In May 2024, the American Society of Clinical Oncology (ASCO) published new guidelines for germline genetic testing in patients with cancer (1). ...

Read more

Genetics as we know and understand it today has been shaped, over decades, by the work of many dedicated scientists around the world, and they all de...

Read more

A comprehensive single-cell transcriptomic atlas of 1.3 million cells from aged human brains reveals cellular pathways linked to Alzheimer’s diseas...

Read more

Infertility is a struggle for many individuals nowadays. According to the World Health Organization (WHO), 1 in 6 people experience infertility, show...

Read more

A recent study highlights promising outcomes for BRCA variant carriers with breast cancer undergoing breast-conserving therapy. Analyzing 172 women, ...

Read more

Epidermolysis bullosa (EB), sometimes called butterfly skin, is a group of rare skin diseases with a common symptom: fragile skin that tears and blis...

Read more

In the rapidly evolving field of human genetics diagnostics, laboratories face the challenge of keeping up with the latest advancements in technology...

Read more

Medicine as we know it has been around for just over 100 years. Before this, alcohol and opium were the main forms of pain relief in Europe. The deve...

Read more

Below you can read the two winning essays from the second annual DNA essay competition. The subject of the essay was “Family history is one of the ...

Read more