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ROGDI
rogdi atypical leucine zipper
ROGDI is located on the short (p) arm of chromosome 16, at band 16p13.3. Arm ratio per GRCh38 - banding schematic.
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Overview
ROGDI, short for rogdi atypical leucine zipper, resides on chromosome 16 and encodes a 287-amino-acid protein whose precise biological role remains under investigation. The gene name reflects the protein's structural feature: an atypical leucine zipper motif, which differs from classical leucine zippers found in many transcription factors.
Mutations in ROGDI cause Kohlschütter-Tönz syndrome, a rare autosomal recessive disorder characterised by severe intellectual disability, early-onset seizures (epilepsy), and amelogenesis imperfecta (defective tooth enamel formation). The combination of neurological and dental manifestations suggests the ROGDI protein plays important roles in both brain development and enamel-producing cells. Because the condition follows recessive inheritance, individuals typically require two altered gene copies (one from each parent) to develop symptoms.
What the gene does
The ROGDI protein contains an atypical leucine zipper, a structural motif usually involved in protein-protein interactions. Unlike canonical leucine zippers that commonly mediate DNA binding through dimerisation, the ROGDI leucine zipper appears to have diverged in sequence and may participate in alternative cellular pathways.
Current evidence suggests the protein may function in cellular regulation or signalling networks that are critical during neurodevelopment and in ameloblasts, the specialised cells responsible for secreting tooth enamel. The specific molecular partners and downstream targets of ROGDI remain areas of active research. Loss of functional ROGDI protein disrupts processes necessary for normal brain maturation and enamel mineralisation, though the precise biochemical mechanisms linking these two tissues are not yet fully elucidated.
The protein's evolutionary conservation across species suggests it performs essential housekeeping or regulatory functions, rather than being limited to a single tissue type, even though clinical manifestations predominantly affect the nervous system and teeth.
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Chromosome location
ROGDI is located on the short arm of chromosome 16 at band p13.3, a region near the chromosome's tip. The genomic sequence spans a relatively compact area, and the gene produces a single main protein isoform. Chromosome 16p13.3 contains several genes implicated in developmental disorders, reflecting the region's importance in early growth and differentiation processes.
Protein structure
Domain architecture has not been experimentally characterised in detail for this protein. The defining structural feature is the atypical leucine zipper motif embedded within the amino acid sequence. This motif consists of leucine residues positioned at regular intervals, creating a hydrophobic interface that typically enables coiled-coil formation and interaction with partner proteins. However, deviations from the classic leucine zipper consensus sequence give ROGDI its 'atypical' designation, suggesting the protein may interact with a distinct set of cellular partners or function through an unconventional mechanism compared to well-studied leucine zipper proteins.
Key variants
Pathogenic variants in ROGDI are rare and typically consist of loss-of-function mutations, including nonsense changes that introduce premature stop codons, frameshift insertions or deletions, and splice-site alterations that disrupt normal gene processing. These mutations generally prevent production of a functional protein. The variant landscape reflects the gene's autosomal recessive disease mechanism: carriers of a single pathogenic variant do not exhibit symptoms, whilst individuals inheriting two pathogenic alleles develop Kohlschütter-Tönz syndrome.
No pathogenic or likely-pathogenic ClinVar variants recorded yet for this gene.
Associated conditions
Biallelic pathogenic variants in ROGDI cause Kohlschütter-Tönz syndrome, a rare condition first described in the medical literature in the 1970s. The syndrome presents in early childhood with a triad of features: profound developmental delay or intellectual disability, epileptic seizures that often begin in infancy, and amelogenesis imperfecta resulting in abnormally thin, discoloured, or fragile tooth enamel. The neurological component typically dominates the clinical picture, with affected individuals experiencing significant cognitive impairment and seizures that may be challenging to control. The dental abnormalities, whilst not life-threatening, contribute to difficulties with feeding and oral health throughout life.
No disease links recorded for this gene in our reference set.
Inheritance pattern
Conditions caused by pathogenic ROGDI variants typically follow autosomal recessive inheritance.
When both parents are carriers, each child has a 25% chance of being affected, 50% of being a carrier, and 25% of being unaffected.
UK clinical status
ROGDI appears on multiple NHS Genomic Medicine Service gene panels, reflecting its recognised role in several clinical presentations. It holds green (high-evidence) status on the Amelogenesis imperfecta panel (R340), Early onset or syndromic epilepsy panel (R59), Fetal anomalies panel (R21), and Intellectual disability panel (R29). This multi-panel presence underscores how ROGDI-related disease bridges dental, neurological, and developmental specialties. The gene is also listed in the Developmental Disorders Genotype-to-Phenotype database (DDG2P), confirming its status as an established cause of childhood-onset developmental conditions. NHS laboratories may sequence ROGDI when clinicians encounter patients with unexplained epilepsy combined with enamel defects or in prenatal settings where structural brain anomalies are detected.
Sources: NHS GMS PanelApp · Genomics England PanelApp · NHS National Genomic Test Directory
Frequently asked questions
What inheritance pattern does ROGDI follow?
ROGDI follows an autosomal recessive inheritance pattern. This means an individual must inherit two pathogenic variants (one from each parent) to develop Kohlschütter-Tönz syndrome. Carriers with a single variant are typically unaffected.
Why does ROGDI affect both teeth and the brain?
The ROGDI protein appears to play important roles in both developing nerve cells and ameloblasts (enamel-forming cells in teeth). When the protein is non-functional, both tissues are affected, leading to the combination of neurological and dental features seen in Kohlschütter-Tönz syndrome.
Is genetic testing for ROGDI available on the NHS?
Yes, ROGDI testing is available through the NHS Genomic Medicine Service for patients meeting clinical criteria on relevant gene panels, including those for epilepsy, intellectual disability, amelogenesis imperfecta, and foetal anomalies. A clinician would typically arrange testing based on the patient's specific symptoms.