New Insights Into DHX30-Related Neurodevelopmental Disorder: Case Report and Comprehensive Review

September 7, 2026 2 Min Read

Introduction to DHX30-Related Neurodevelopmental Disorder

DHX30-related neurodevelopmental disorder (DHX30-NDD) is a recently identified condition characterized by a range of developmental challenges. Advances in whole exome sequencing (WES) have enhanced the ability to diagnose such neurodevelopmental disorders, although interpreting novel genetic variants remains complex.

Case Report Highlights a Novel Feature

A recent case involved a child presenting with global developmental delay (GDD) and right-sided microtia, a malformation of the external ear. Genetic testing revealed a de novo heterozygous missense variant in the DHX30 gene (c.1478G > A; p.Arg493His), confirming the diagnosis of DHX30-NDD. Notably, this is the first reported case linking DHX30-NDD with microtia, potentially broadening the known clinical spectrum of the disorder.

Comprehensive Review of Existing Cases

Researchers conducted a scoping review of 10 studies encompassing 51 individuals diagnosed with DHX30-NDD. The analysis showed that DHX30 mutations occur predominantly as de novo variants and affect both males (22 cases) and females (29 cases) almost equally.

Common clinical features identified included:

Motor delay in 98% (50/51) of cases
Global developmental delay or intellectual disability in 98% (48/49)
Hypotonia (reduced muscle tone) in 94.1% (48/51)
Feeding difficulties in 74.5% (38/51)
Ataxia (coordination problems) in 73.9% (17/23)
Abnormal brain imaging findings in 73.5% (36/49)
Absent expressive language in 72.9% (35/48)

Additional frequent features included digital anomalies (60.8%), eye anomalies (54.9%), autistic behaviors (54.5%), sleep disturbances (51%), joint hypermobility (49%), microcephaly (small head size) (45.1%), and ear anomalies (43.1%).

Implications for Diagnosis and Clinical Practice

This study underscores the value of WES in diagnosing children with unexplained global developmental delay. The identification of a novel feature such as microtia suggests that the clinical presentation of DHX30-NDD may be broader than previously recognized. Clinicians should consider DHX30 variants in patients with complex neurodevelopmental profiles, especially when accompanied by physical anomalies.

Moreover, the findings highlight the importance of ongoing reanalysis of WES data, as evolving knowledge about genetic variants can refine diagnoses and inform patient management.

Limitations and Considerations

While this review consolidates current knowledge on DHX30-NDD, the relatively small number of reported cases limits the ability to fully define the complete phenotypic spectrum. The association between DHX30 variants and specific physical anomalies like microtia requires further confirmation in larger cohorts.

Conclusion

Expanding the known features of DHX30-related neurodevelopmental disorder aids in better recognizing and diagnosing this rare condition. Whole exome sequencing remains a critical tool in uncovering underlying genetic causes in children with developmental delays, and continuous updates to variant interpretation are essential as research progresses.

For more detailed information, see the original publication at PubMed.