Severe microcephaly

Gene: CEP55

The rating of this gene has been updated following NHS Genomic Medicine Service approval.

Created: 10 Mar 2022, 10:52 a.m. | Last Modified: 10 Mar 2022, 10:52 a.m.

Panel Version: 2.282

Comment on list classification: Changed rating from Green to Amber so that Green genes on this panel reflect the NHS signed-off version. This will be reviewed at the next GMS panel update (added 'for-review' tag).

Created: 20 Oct 2020, 3:37 p.m. | Last Modified: 20 Oct 2020, 3:37 p.m.

Panel Version: 2.33

Green List (high evidence)

PMID:32100459 (Barrie et al., 2020) describe 7 living indivduals (5 families) with biallelic CEP55 variants (compound het, or homozygous splice site variant). Three sisters (Patients 5,6,7) have severe microcephaly (-7.1 SD, -5.5, -5.5). An additional 3 unrelated patients (Patients 1,2,3) have microcephaly scores of -2 SD, -2.7 SD, and Patient 4 has borderline microcephaly. Severe microcephaly (NHS Test Directory) is defined as having an occipitofrontal circumference (OFC) beyond 3 standard deviations below the mean for age. There are 4 unrelated cases which meet this threshold (3 sisters) or are close to this threshold (3 unrelated patients) and therefore on balance have rated as Green awaiting further GLH review.

Created: 21 Apr 2020, 2 p.m. | Last Modified: 21 Apr 2020, 2:16 p.m.

Panel Version: 2.5

Added to Microcephaly panel on advice from Helen Brittain, Genomics England Clinical Team. Phenotype of living individuals described in PMID:32100459 (Barrie et al., 2020) includes microcephaly.
Sources: Literature

Created: 21 Apr 2020, 2 p.m.

Mode of inheritance
BIALLELIC, autosomal or pseudoautosomal

Phenotypes
microcephaly, speech delays, and bilateral toe syndactyly

Publications

• 32100459