NM_000505.4:c.1768T>G

Variant names:

• chr5-177402372-A-C
• rs1157280571
• NM_000505.4:c.1768T>G

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PM1 PM2 PP3_Strong

The NM_000505.4(F12):​c.1768T>G​(p.Cys590Gly) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: F12 NM_000505.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 5.94

Genes affected

F12 (HGNC:3530): (coagulation factor XII) This gene encodes coagulation factor XII which circulates in blood as a zymogen. This single chain zymogen is converted to a two-chain serine protease with an heavy chain (alpha-factor XIIa) and a light chain. The heavy chain contains two fibronectin-type domains, two epidermal growth factor (EGF)-like domains, a kringle domain and a proline-rich domain, whereas the light chain contains only a catalytic domain. On activation, further cleavages takes place in the heavy chain, resulting in the production of beta-factor XIIa light chain and the alpha-factor XIIa light chain becomes beta-factor XIIa heavy chain. Prekallikrein is cleaved by factor XII to form kallikrein, which then cleaves factor XII first to alpha-factor XIIa and then to beta-factor XIIa. The active factor XIIa participates in the initiation of blood coagulation, fibrinolysis, and the generation of bradykinin and angiotensin. It activates coagulation factors VII and XI. Defects in this gene do not cause any clinical symptoms and the sole effect is that whole-blood clotting time is prolonged. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Likely_pathogenic. Variant got 8 ACMG points.

• PM1: In a chain Coagulation factor XIIa light chain (size 242) in uniprot entity FA12_HUMAN there are 13 pathogenic changes around while only 2 benign (87%) in NM_000505.4
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.992

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
F12	NM_000505.4	c.1768T>G	p.Cys590Gly	missense_variant	Exon 14 of 14	ENST00000253496.4	NP_000496.2
F12	XM_011534462.3	c.1432T>G	p.Cys478Gly	missense_variant	Exon 11 of 11		XP_011532764.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
F12	ENST00000253496.4	c.1768T>G	p.Cys590Gly	missense_variant	Exon 14 of 14	1	NM_000505.4	ENSP00000253496.3

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Hereditary angioedema type 3 Uncertain:1

-

CeMIA

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.1768T>G (p.Cys590Gly) variant, located in exon 14 of the F12 gene, was detected in one nC1-INH-HAE German patient. The patient is presenting with recurrent angioedema of unclear origin. Bioinformatic analysis by SIFT and PolyPhen2 algorithms predicted this mutation as deleterious and possibly damaging, respectively. It was not detected amongst 125,748 exomes and 15,708 genomes of the Genome Aggregation Database (gnomAD), indicating that it is not a common variant. Taking all the above into account and according to ACMG Guidelines (Criteria:PM2,PP3) the variant is considered as of uncertain significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.95
BayesDel_addAF	Pathogenic	0.38	D
BayesDel_noAF	Pathogenic	0.30
CADD	Pathogenic	30
DANN	Uncertain	0.98
DEOGEN2	Pathogenic	0.86	D
Eigen	Pathogenic	0.94
Eigen_PC	Pathogenic	0.86
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.92	D
M_CAP	Pathogenic	0.31	D
MetaRNN	Pathogenic	0.99	D
MetaSVM	Uncertain	0.42	D
MutationAssessor	Pathogenic	3.3	M
PrimateAI	Benign	0.30	T
PROVEAN	Pathogenic	-9.8	D
REVEL	Pathogenic	0.82
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Polyphen		1.0	D
Vest4		0.91
MutPred		0.92		Gain of disorder (P = 0.0016);
MVP		0.92
MPC		0.74
ClinPred		1.0	D
GERP RS		5.4
Varity_R		0.99
gMVP		0.98

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs1157280571; hg19: chr5-176829373;