Abstract
Hypoplastic left heart (HLH) occurs in at least 1 in 10 000 live births but may be more common in utero. Its causes are poorly understood but a number of affected cases are associated with chromosomal abnormalities. We set out to localize the breakpoints in a patient with sporadic HLH and a de novo translocation. Initial studies showed that the apparently simple 1q41;3q27.1 translocation was actually combined with a 4-Mb inversion, also de novo, of material within 1q41. We therefore localized all four breakpoints and found that no known transcription units were disrupted. However we present a case, based on functional considerations, synteny and position of highly conserved non-coding sequence elements, and the heterozygous Prox1+/− mouse phenotype (ventricular hypoplasia), for the involvement of dysregulation of the PROX1 gene in the aetiology of HLH in this case. Accordingly, we show that the spatial expression pattern of PROX1 in the developing human heart is consistent with a role in cardiac development. We suggest that dysregulation of PROX1 gene expression due to separation from its conserved upstream elements is likely to have caused the heart defects observed in this patient, and that PROX1 should be considered as a potential candidate gene for other cases of HLH. The relevance of another breakpoint separating the cardiac gene ESRRG from a conserved downstream element is also discussed.
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Acknowledgements
We are indebted to the proband and his family. HKG was supported by a research fellowship from the Guy's and St Thomas' Charitable Foundation. BLN and NPC are supported by the Wellcome Trust. SRP was supported by a Health Foundation Fellowship. CS, VJK and DIW are supported by the British Heart Foundation and Little Heart Matters. RGR received funding from the British Heart Foundation and the Muscular Dystrophy Campaign. We are not aware of any conflicts of interest.
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Gill, H., Parsons, S., Spalluto, C. et al. Separation of the PROX1 gene from upstream conserved elements in a complex inversion/translocation patient with hypoplastic left heart. Eur J Hum Genet 17, 1423–1431 (2009). https://doi.org/10.1038/ejhg.2009.91
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DOI: https://doi.org/10.1038/ejhg.2009.91
