Chimeric CYP21A1P/CYP21A2 Genes in 21-Hydroxylase Deficiency Detected by Long-Read Sequencing and Phenotypes Correlation
Authors' conclusion
LRS is a comprehensive genetic testing method for 21-OHD patients, effectively detecting both CYP21A2 gene variants and CYP21A1P/CYP21A2 chimeric gene types. This study expands the CYP21A2 variant spectrum by identifying a novel chimera. Haplotype analysis revealed diverse haplotypes for each chimeric gene type, suggesting the absence of a common founder effect. The strong genotype-phenotype correlation aids genetic counseling and supports personalized treatment.
Study context
- Population
- Patients with 21-hydroxylase deficiency enrolled at Peking Union Medical College Hospital, 2015–2023113 with CYP21A2 large deletion
- Participants
- 869 patients
- Outcome
- Types of chimeric CYP21A1P/CYP21A2 genes detected by long-read sequencing and genotype-phenotype correlations
Methodological detailssingle-centre, long-read sequencing, haplotype analysis, in vitro functional assays
- Single-centre
- Long-read sequencing
- Haplotype analysis
- In vitro functional assays
Main finding
As reported in the abstract
Types of chimeric genes identified across 119 alleles, incl. novel type CH-10
10
CH-1 share of all types (most common)
50.4%
Observational data: associations, not effects.
Further findings
Haplotype analysis of 24 SNPs within CH-1
- Haplotypes revealed; haplotype 11 most prevalent
- 25
In vitro enzyme activity of CYP21A2 variants p.L100P and p.L301V (linked to simple virilizing type)
- p.L100P, 17-hydroxyprogesterone to 11-deoxycortisol
- 1.36 ± 0.44%
- p.L301V, 17-hydroxyprogesterone to 11-deoxycortisol
- 1.63 ± 0.19%
- p.L100P, progesterone to 11-deoxycorticosterone
- 1.36 ± 0.58%
- p.L301V, progesterone to 11-deoxycorticosterone
- 3.99 ± 1.09%
Genotype-phenotype consistency across 4 genotype groups
- Consistency rates
- 78.6% to 84%
Original publication
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