Bleeding and platelet disorders

Gene: F12

Green List (high evidence)

After NHS Genomic Medicine Service consideration, the rating of this gene has not been changed and remains Green, and the mode of inheritance of this gene has not been changed and remains 'BOTH monoallelic and biallelic, autosomal or pseudoautosomal'.

GMS reviewers note that defects in F12 are associated with prolonged APTT; therefore, this should remain a green gene in the R90 panel. It should be left on the panel as may explain prolonged aPTT if not bleeding, so potentially still useful in the diagnostic pathway. As with most genes encoding coagulation factors, both monoallelic and biallelic F7 variants can be clinically significant.

Created: 1 Feb 2023, 7:59 a.m. | Last Modified: 1 Feb 2023, 8:08 a.m.

Panel Version: 2.3

Added the Q2_22_rating tag to make it clear that both the rating and the MOI of this gene is being considered.

Created: 6 Oct 2022, 2:36 p.m. | Last Modified: 6 Oct 2022, 2:36 p.m.

Panel Version: 1.44

This gene will be flagged for GMS review regarding the pertinence of monoallelic variants to this panel and whether the MOI should remain as 'both mono- and biallelic' or changed to 'biallelic' only or whether this gene should be demoted on this panel altogether.

Monoallelic variants are associated with hereditary angioedema (MIM# 610618) characterised clinically by recurrent skin swelling, abdominal pain attacks, and episodes of upper airway obstruction but otherwise patients do not display any strong evidence of abnormal bleeding or clotting phenotypes. Biallelic variants cause a separate disorder, factor XII deficiency (MIM# 234000) associated with hypercoagulation which in some cases has been linked to thrombus formation.

Created: 21 Mar 2022, 2:32 p.m. | Last Modified: 4 Apr 2022, 9:28 a.m.

Panel Version: 1.36

I don't know

No abnormal bleeding, asymptomatic prolonged PTT.

Created: 12 Aug 2020, 3:50 a.m. | Last Modified: 12 Aug 2020, 3:50 a.m.

Panel Version: 1.6

Phenotypes
Factor XII deficiency, MIM# 234000

Green List (high evidence)

Gene rating submitted by Steve Keeney Molecular Diagnostics Centre Central Manchester NHS Foundation Trust January 2019 on behalf of North West GLH for the GMS Haematology specialist test group

Created: 18 Feb 2019, 11:23 a.m.

Mode of inheritance
BOTH monoallelic and biallelic, autosomal or pseudoautosomal

Phenotypes
234000 Factor XII deficiency, hereditary Angioedema type III

Green List (high evidence)

Gene rating submitted by Mandy Nesbitt Sheffield Diagnostic Genetics Service, Sheffield Children's NHS Trust January 2019 on behalf of Yorkshire and North East GLH for the GMS Haematology specialist test group.

Created: 13 Feb 2019, 11:32 a.m.

Mode of inheritance
BOTH monoallelic and biallelic (but BIALLELIC mutations cause a more SEVERE disease form), autosomal or pseudoautosomal

Phenotypes
234000 Factor XII deficiency, hereditary Angioedema type III

Green List (high evidence)

Gene rating submitted by Mike Mitchell Viapath St. Thomas' Hospital January 2019 on behalf of London South GLH for the GMS Haematology specialist test group.

Created: 7 Feb 2019, 1:21 p.m.

Mode of inheritance
BOTH monoallelic and biallelic (but BIALLELIC mutations cause a more SEVERE disease form), autosomal or pseudoautosomal

Phenotypes
234000 Factor XII deficiency, hereditary Angioedema type III

Variants in this GENE are reported as part of current diagnostic practice

I don't know

Initial gene list (Consensus Genes for SPEC HAEM Panels 31.01.19 North West v1 FINAL.xlsx) collated by Steve Keeney Molecular Diagnostics Centre Central Manchester NHS Foundation Trust January 2019 on behalf of North West GLH for the GMS Haematology specialist test group. Gene Symbol submitted: F12; Suggested initial gene rating: Green List (high evidence); Are variants in this gene part of your current diagnostic practice? No; Mode of inheritance: BOTH monoallelic and biallelic, autosomal or pseudoautosomal; Phenotypes: 234000 Factor XII deficiency, hereditary Angioedema type III; PMID(s): none submitted

Created: 18 Feb 2019, 11:28 a.m.

Initial gene list (Consensus Genes for Panels_Haem_SHEFFIELD-29.01.2019.xlsx) collated by Mandy Nesbitt Sheffield Diagnostic Genetics Service, Sheffield Children's NHS Trust January 2019 on behalf of Yorkshire and North East GLH for the GMS Haematology specialist test group. Gene Symbol submitted: F12; Suggested intial gene rating: Green List (high evidence); Are variants in this gene part of your current diagnostic practice? No; Mode of inheritance: BOTH monoallelic and biallelic (but BIALLELIC mutations cause a more SEVERE disease form), autosomal or pseudoautosomal; Phenotypes: 234000 Factor XII deficiency, hereditary Angioedema type III; PMID(s): none submitted

Created: 13 Feb 2019, 11:34 a.m.

Initial gene list (Consensus Genes for Panels_Bleeding and Thrombosis_South London.xlsx) collated by Mike Mitchell Viapath St. Thomas' Hospital January 2019 on behalf of London South GLH for the GMS Haematology specialist test group. Gene Symbol submitted: F12; Suggested intial gene rating: Green List (high evidence); Are variants in this gene part of your current diagnostic practice? Yes; Mode of inheritance: BOTH monoallelic and biallelic (but BIALLELIC mutations cause a more SEVERE disease form), autosomal or pseudoautosomal; Phenotypes: 234000 Factor XII deficiency, hereditary Angioedema type III; PMID(s): none submitted

Created: 7 Feb 2019, 1:28 p.m.

Initial gene list (Consensus Genes for Panels 17.12.18_Haem_WWMGLH_v3.xlxs) collated by Carl Fratter Oxford Medical Genetics Laboratories January 2019 on behalf of Wessex and the West Midlands GLH for the GMS Haematology specialist test group. Gene Symbol submitted: F12; Suggested intial gene rating: Green List (high evidence); Are variants in this gene as part of your current diagnostic practice? Yes; Mode of inheritance: BOTH monoallelic and biallelic, autosomal or pseudoautosomal; Phenotypes: 234000 Factor XII deficiency; 610618 Hereditary Angioedema type III; PMID(s): 27003566; 9354665; 20386432

Created: 5 Feb 2019, 1:26 p.m.

Green List (high evidence)

Gene rating submitted by Carl Fratter Oxford Medical Genetics Laboratories January 2019 on behalf of Wessex and the West Midlands GLH for the GMS Haematology specialist test group.

Created: 5 Feb 2019, 11:19 a.m.

Variants in this GENE are reported as part of current diagnostic practice