Table 1.

Molecular Genetic Testing Used in Congenital Dyserythropoietic Anemia Type I (CDA I)

Gene 1Proportion of CDA I Attributed to Pathogenic Variants in GeneProportion of Pathogenic Variants 2 Detectable by Method
Sequence analysis 3Gene-targeted deletion/duplication analysis 4
CDAN1 85% 5100%Unknown 6
CDIN1 ~5% 7100%Unknown 6
Unknown 8~10%NA
1.
2.

See Molecular Genetics for information on variants detected in this gene.

3.

Sequence analysis detects variants that are benign, likely benign, of uncertain significance, likely pathogenic, or pathogenic. Variants may include small intragenic deletions/insertions and missense, nonsense, and splice site variants; typically, exon or whole-gene deletions/duplications are not detected. For issues to consider in interpretation of sequence analysis results, click here.

4.

Gene-targeted deletion/duplication analysis detects intragenic deletions or duplications. Methods used may include quantitative PCR, long-range PCR, multiplex ligation-dependent probe amplification (MLPA), and a gene-targeted microarray designed to detect single-exon deletions or duplications.

5.

In 60% of affected individuals two pathogenic variants were identified by sequence analysis, in 28% only one pathogenic variant was identified, and in 11% no pathogenic variant was identified (Note: Testing to detect splice site variants and large deletions was not performed) [Authors and other labs, combined data, unpublished].

6.

No data on detection rate of gene-targeted deletion/duplication analysis are available.

7.

Author, personal observation

8.

The existence of at least one additional locus is suggested by the absence of pathogenic variants in CDAN1 or CDIN1 in seven families with CDA I [Babbs et al 2013].

From: Congenital Dyserythropoietic Anemia Type I

Cover of GeneReviews®
GeneReviews® [Internet].
Adam MP, Feldman J, Mirzaa GM, et al., editors.
Seattle (WA): University of Washington, Seattle; 1993-2024.
Copyright © 1993-2024, University of Washington, Seattle. GeneReviews is a registered trademark of the University of Washington, Seattle. All rights reserved.

GeneReviews® chapters are owned by the University of Washington. Permission is hereby granted to reproduce, distribute, and translate copies of content materials for noncommercial research purposes only, provided that (i) credit for source (http://www.genereviews.org/) and copyright (© 1993-2024 University of Washington) are included with each copy; (ii) a link to the original material is provided whenever the material is published elsewhere on the Web; and (iii) reproducers, distributors, and/or translators comply with the GeneReviews® Copyright Notice and Usage Disclaimer. No further modifications are allowed. For clarity, excerpts of GeneReviews chapters for use in lab reports and clinic notes are a permitted use.

For more information, see the GeneReviews® Copyright Notice and Usage Disclaimer.

For questions regarding permissions or whether a specified use is allowed, contact: ude.wu@tssamda.

NCBI Bookshelf. A service of the National Library of Medicine, National Institutes of Health.