Table 1.

Molecular Genetic Testing Used in POLR3-Related Leukodystrophy

Gene 1Proportion of POLR3-Related Leukodystrophy Attributed to Pathogenic Variants in GeneProportion of Pathogenic Variants 2 Detected by Method
Sequence analysis 3Gene-targeted deletion/duplication analysis 4
POLR3A 41% 5, 6~100% 5, 6Unknown 7
POLR3B 49% 5, 8~97% 5, 8~3% 9
POLR1C 5% 10~100% 10Unknown 7
Unknown5%NA
1.

See Table A. Genes and Databases for chromosome locus and protein.

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 missense, nonsense, and splice site variants and small intragenic deletions/insertions; 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 a range of techniques such as 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.
6.
7.

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

8.
9.
10.

From: POLR3-Related Leukodystrophy

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