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Cutaneous clues for diagnosing X-chromosomal disorders.
M Vreeburg1, S C E H Sallevelt, A P A Stegmann
1Department of Clinical Genetics.
Clinical Genetics
|April 13, 2013
Summary
Seven percent of patients with hereditary skin conditions had X-linked genetic abnormalities. Dermatologist and geneticist collaboration is key for diagnosing these X-linked disorders, with mosaicism often playing a role.
Area of Science:
- Genetics
- Dermatology
- Medical Diagnostics
Background:
- Hereditary skin diseases can involve X-linked genetic factors.
- Identifying X-linked conditions requires specialized expertise.
Purpose of the Study:
- To determine the prevalence of X-linked genetic abnormalities in patients with hereditary skin diseases.
- To highlight the importance of multidisciplinary collaboration in diagnosing these conditions.
- To provide clinical clues for identifying X-linked skin disorders.
Main Methods:
- Retrospective analysis of patients in a multidisciplinary clinic.
- Clinical diagnosis, molecular studies, and cytogenetic analysis were employed.
- Collaboration between dermatologists and clinical geneticists.
Main Results:
- 7% (30 of 409) of patients presented with X-linked abnormalities.
- 24 out of 30 identified cases were confirmed through molecular/cytogenetic studies.
- Mosaicism was identified as a significant factor in many X-linked hereditary skin disorders.
Conclusions:
- Multidisciplinary collaboration is crucial for accurate diagnosis of X-linked skin disorders.
- Clinical and genetic expertise aids in recognizing and confirming these conditions.
- Understanding the role of mosaicism is important for managing X-linked hereditary skin conditions.
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X-linked Traits
In most mammalian species, females have two X sex chromosomes and males have an X and Y. As a result, mutations on the X chromosome in females may be masked by the presence of a normal allele on the second X. In contrast, a mutation on the X chromosome in males more often causes observable biological defects, as there is no normal X to compensate. Trait variations arising from mutations on the X chromosome are called “X-linked”.
X-linked Traits
In most mammalian species, females have two X sex chromosomes and males have an X and Y. As a result, mutations on the X chromosome in females may be masked by the presence of a normal allele on the second X. In contrast, a mutation on the X chromosome in males more often causes observable biological defects, as there is no normal X to compensate. Trait variations arising from mutations on the X chromosome are called “X-linked”.
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Like autosomes, sex chromosomes contain a variety of genes necessary for normal body function. When a mutation in one of these genes results in biological deficits, the disorder is considered sex-linked.
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X and Y Chromosomes
Among mammals, the gender of an organism is determined by the sex chromosomes. Humans have two sex chromosomes, X and Y. Every human diploid cell has 22 pairs of autosomes and one pair of sex chromosomes. A human female has two X chromosomes, while a male has one X chromosome and one Y chromosome.
The germline cells such as egg and sperm cells carry only half the number of chromosomes, i.e., 22 autosomes and one sex chromosome. All eggs have an X chromosome, while sperm cells can carry an X or...
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