Early onset or syndromic epilepsy
Gene: UFC1
Review and rating collated by Tracy Lester (Oxford Medical Genetics Laboratories Oxford University Hospitals NHS Foundation Trust, 2019_02_06) on behalf of Wessex and West Midlands GLH for GMS Neurology specialist test group, for Clinical Indication R59 'Early onset or syndromic epilepsy'. Review contributors: Alison Callaway and John Taylor. Suggested gene rating: Amber.Created: 6 Aug 2019, 8:38 p.m. | Last Modified: 6 Aug 2019, 8:38 p.m.
Panel Version: 1.189
Limited evidence: PMID 29868776 reported 8 patients with a severe neurodevelopmental disorder and of these three had seizures (intractable in two patients).Created: 6 Aug 2019, 8:31 p.m. | Last Modified: 6 Aug 2019, 8:31 p.m.
Panel Version: 1.188
Mode of inheritance
BIALLELIC, autosomal or pseudoautosomal
Phenotypes
Neurodevelopmental disorder with spasticity and poor growth, 618076
Publications
Comment when marking as ready: Associated with relevant phenotype in OMIM and as confirmed Gen2Phen gene. At least 2 variants reported in unrelated cases in which seizures are a phenotypic feature.Created: 27 Nov 2018, 2:46 p.m.
Biallelic UFC1 mutations cause Neurodevelopmental disorder with spasticity and poor growth, MIM 618076.
PMID: 29868776 describes 7 individuals (most) born to consanguineous Saudi families (in one case the parents were not consanguineous but originated from the same tribe) as well as a further individual born to distantly related Swiss parents. One of these patients was previously briefly published by the same authors (PMID: 27431290).
The phenotype consisted of developmental delay (8/8 - usually profound), failure to thrive (8/8), short stature and microcephaly (both observed in 7/8), seizures (4/8) and variable brain MRI anomalies in some of these subjects.
Overall, two UFC1 missense variants are reported [NM_016406.3:c.317C>T or p.(Thr106Ile) and c.68G>A or p.(Arg23Gln) the former in the Saudi individuals]. Functional studies demonstrated the hypomorphic nature of the variants.
UFC1 (as well as UFM1 also discussed in the same article) participate in ufmylation, with mutations in other enzymes of the same process (notably UBA5 - gene rated Green in the ID and epilepsy panels) having already been described in neurodevelopmental disorders.
Epilepsy was a feature in 50% (4/8) of the individuals reported.
As a result this gene can be considered for inclusion in the epilepsy panel as green (or amber).
Sources: Literature, Expert ReviewCreated: 20 Nov 2018, 10:33 a.m.
Mode of inheritance
BIALLELIC, autosomal or pseudoautosomal
Phenotypes
Neurodevelopmental disorder with spasticity and poor growth, 618076
Publications
Source Wessex and West Midlands GLH was added to UFC1.
Source NHS GMS was added to UFC1.
Konstantinos Varvagiannis: Biallelic UFC1 mutations cause
Gene: ufc1 has been classified as Amber List (Moderate Evidence).
Gene: ufc1 has been classified as Amber List (Moderate Evidence).
Publications for gene: UFC1 were set to 29868776
gene: UFC1 was added gene: UFC1 was added to Genetic epilepsy syndromes. Sources: Literature,Expert Review Mode of inheritance for gene: UFC1 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: UFC1 were set to 29868776 Phenotypes for gene: UFC1 were set to Neurodevelopmental disorder with spasticity and poor growth, 618076 Penetrance for gene: UFC1 were set to Complete Review for gene: UFC1 was set to GREEN