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In animals, gender is determined by the number and type of sex chromosome. For example, human females have two X chromosomes, and males have one X and one Y chromosome, whereas C.elegans with one X chromosome is a male, and the one with two X chromosomes is a hermaphrodite.
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Gregor Mendel's work (1822 - 1884) was primarily focused on pea plants. Through his initial experiments, he determined that every gene in a diploid cell has two variants called alleles inherited from each parent. He suggested that amongst these two alleles, one allele is dominant in character and the other recessive. The combination of alleles determines the phenotype of a gene in an organism.
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Naturally occurring mutants inform SHBG structure and function.

Tsung-Sheng Wu1, Geoffrey L Hammond

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Summary
This summary is machine-generated.

Investigating single nucleotide polymorphisms in the sex hormone-binding globulin (SHBG) gene reveals how these variants impact SHBG

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Area of Science:

  • Biochemistry
  • Genetics
  • Molecular Biology

Background:

  • Sex hormone-binding globulin (SHBG) is crucial for transporting and regulating sex steroids.
  • Polymorphisms in the SHBG gene are associated with metabolic syndrome and other sex steroid-dependent diseases.

Purpose of the Study:

  • To investigate the functional impact of previously uncharacterized SHBG single nucleotide polymorphisms (SNPs).
  • To understand how these SHBG variants affect protein production, biochemical properties, and steroid binding.

Main Methods:

  • Analysis of 18 nonsynonymous SNPs in the N-terminal laminin G-like domain of SHBG.
  • Assessment of SHBG production, secretion, glycosylation, calcium binding, dimerization, and sex steroid affinity for mutant forms.

Main Results:

  • Eight SHBG SNPs significantly altered protein production or biochemical properties.
  • Specific mutants showed disrupted glycosylation (T7N, G195E), altered estradiol binding (R135C, L165M, E176K), modified androgen binding (R123H, R123C), and impaired calcium binding and dimerization (T48I).
  • Calcium supplementation restored function to the T48I mutant.

Conclusions:

  • Naturally occurring SHBG mutants provide critical insights into SHBG structure-function relationships.
  • Defects in SHBG production or function due to these polymorphisms are relevant for understanding disease pathogenesis.
  • Altered SHBG function must be considered when using SHBG as a biomarker for diseases.