Severe microcephalyGene: DNA2
Comment on list classification: Upgraded from Red to Amber but there is sufficient evidence to promote this gene to Green at the next GMS panel update - 4 different homozygous variants identified in at least 5 unrelated families with microcephalic primordial dwarfism (PMIDs: 24389050; 31045292)
Created: 6 May 2021, 9:52 a.m. | Last Modified: 6 May 2021, 9:52 a.m.
Panel Version: 2.142
Three families described with bi-allelic variants in this gene and a primordial dwarfism/Seckel syndrome phenotype.
Created: 4 Sep 2020, 10:21 a.m. | Last Modified: 4 Sep 2020, 10:21 a.m.
Panel Version: 2.20
Mode of inheritance
BIALLELIC, autosomal or pseudoautosomal
Seckel syndrome 8, MIM#615807
Variants in this GENE are reported as part of current diagnostic practice
As discussed with the GMS Neurology Specialist Test Group webex call 11thJuly 2019: The Specialist Test Group all agreed that there is only enough evidence to rate this gene Red
Created: 29 Jul 2019, 4:18 p.m. | Last Modified: 29 Jul 2019, 4:18 p.m.
Panel Version: 1.62
Comment when marking as ready: Andrew Jackson (the submitter of the original expert list) confirmed that he considers DNA2 as a candidate gene rather than a clinically confirmed gene for Seckel syndrome. There is only 1 reported allele in OMIM for 2 individuals of the same family.
Created: 3 Jan 2017, 1:57 p.m.
In an 18-year-old uncle and 9-year-old niece, both born of consanguineous marriages with features consistent with Seckel syndrome (SCKL8; OMIM: 615807), Shaheen et al. (PMID:24389050, 2014) identified homozygosity for a 1-bp deletion (c.3372+6delC) in intron 20 of the DNA2 gene, predicted to cause truncation of 1 transcript and abnormal splicing of another 2 transcripts. This is the only recorded variant in OMIM.
Created: 3 Jan 2017, 1:55 p.m.
Confirmed DD gene for PRIMORDIAL DWARFISM SECKEL SYNDROME 8 (OMIM:615807).
Created: 3 Jan 2017, 1:53 p.m.
Publications for gene: DNA2 were set to 24389050; 31045292
Phenotypes for gene: DNA2 were changed from Seckel syndrome 8, OMIM:615807 to Seckel syndrome 8, OMIM:615807; Microcephalic primordial dwarfism, MONDO:0017950
Tag Q2_21_rating tag was added to gene: DNA2.
Gene: dna2 has been classified as Amber List (Moderate Evidence).
Publications for gene: DNA2 were set to 24389050
Phenotypes for gene: DNA2 were changed from ?Seckel syndrome 8, 615807; SCKL8 to Seckel syndrome 8, OMIM:615807
Source NHS GMS was added to DNA2.
2nd March 2017: Panel review was assessed and panel was revised according to expert review and additional curation. This panel began with an expert gene list from Professor Andrew Jackson (University of Edinburgh) for primary microcephaly (MCPH) and microcephalic primordial dwarfism (MPD). Other disorders are included where microcephaly is a primary feature. Disorders where microcephaly is not the primary presenting feature are not included (e.g. congenital disorders of glycosylation, Proud syndrome, Norrie disease). The panel does not include disorders with a cortical malformation (e.g. lissencephaly) since the Malformations of cortical development' panel would be applied to these patients.
This gene has been classified as Red List (Low Evidence).
DNA2 was added to Primary Microcephaly - Microcephalic Dwarfism Spectrumpanel. Sources: Other
DNA2 was created by rfoulger