Abstract
Most patients with autosomal dominant hyper-IgE syndrome (AD-HIES) carry rare heterozygous STAT3 variants. Only six of the 135 in-frame variants reported have been experimentally shown to be dominant negative (DN), and it has been recently suggested that eight out-of-frame variants operate by haploinsufficiency. We experimentally tested these 143 variants, 7 novel out-of-frame variants found in HIES patients, and other STAT3 variants from the general population. Strikingly, all 15 out-of-frame variants were DN via their encoded (1) truncated proteins, (2) neoproteins generated from a translation reinitiation codon, and (3) isoforms from alternative transcripts or a combination thereof. Moreover, 128 of the 135 in-frame variants (95%) were also DN. The patients carrying the seven non-DN STAT3 in-frame variants have not been studied for other genetic etiologies. Finally, none of the variants from the general population tested, including an out-of-frame variant, were DN. Overall, our findings show that heterozygous STAT3 variants, whether in or out of frame, underlie AD-HIES through negative dominance rather than haploinsufficiency.
| Original language | English |
|---|---|
| Article number | e20202592 |
| Journal | Journal of Experimental Medicine |
| Volume | 218 |
| Issue number | 8 |
| DOIs | |
| Publication status | Published - 2 Aug 2021 |
| Externally published | Yes |
Keywords
- Adolescent
- Adult
- Alleles
- Alternative Splicing/genetics
- Child
- Child, Preschool
- Codon, Nonsense/genetics
- Evolution, Molecular
- Family
- Female
- Frameshift Mutation/genetics
- Genes, Dominant
- Genetics, Population
- HEK293 Cells
- Humans
- Infant
- Infant, Newborn
- Job Syndrome/genetics
- Male
- Middle Aged
- Mutation/genetics
- Pedigree
- Protein Biosynthesis
- RNA, Messenger/genetics
- STAT3 Transcription Factor/genetics
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