5-177403367-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM1 PM2

The NM_000505.4(F12):c.1418G>A(p.Gly473Asp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: F12 NM_000505.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.29

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]

GRK6 (HGNC:4545): (G protein-coupled receptor kinase 6) This gene encodes a member of the guanine nucleotide-binding protein (G protein)-coupled receptor kinase subfamily of the Ser/Thr protein kinase family. The protein phosphorylates the activated forms of G protein-coupled receptors thus initiating their deactivation. Several transcript variants encoding different isoforms have been described for this gene. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM1: In a disulfide_bond (size 127) in uniprot entity FA12_HUMAN there are 7 pathogenic changes around while only 1 benign (88%) in NM_000505.4
• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
F12	NM_000505.4	c.1418G>A	p.Gly473Asp	missense_variant	12/14	ENST00000253496.4
F12	XM_011534462.3	c.1082G>A	p.Gly361Asp	missense_variant	9/11

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
F12	ENST00000253496.4	c.1418G>A	p.Gly473Asp	missense_variant	12/14	1	NM_000505.4	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1446370 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 720032

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Inborn genetic diseases Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Dec 02, 2021

The c.1418G>A (p.G473D) alteration is located in exon 12 (coding exon 12) of the F12 gene. This alteration results from a G to A substitution at nucleotide position 1418, causing the glycine (G) at amino acid position 473 to be replaced by an aspartic acid (D). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.17
BayesDel_addAF	Uncertain	0.049	T
BayesDel_noAF	Benign	-0.17
Cadd	Uncertain	25
Dann	Uncertain	1.0
DEOGEN2	Uncertain	0.60	D
Eigen	Uncertain	0.38
Eigen_PC	Uncertain	0.33
FATHMM_MKL	Uncertain	0.77	D
LIST_S2	Benign	0.58	T
M_CAP	Pathogenic	0.63	D
MetaRNN	Uncertain	0.67	D
MetaSVM	Uncertain	0.46	D
MutationAssessor	Benign	0.28	N
MutationTaster	Benign	0.65	N
PrimateAI	Uncertain	0.61	T
PROVEAN	Uncertain	-3.1	D
REVEL	Uncertain	0.45
Sift	Uncertain	0.016	D
Sift4G	Uncertain	0.050	T
Polyphen		1.0	D
Vest4		0.49
MutPred		0.41		Gain of disorder (P = 0.0679);
MVP		0.94
MPC		2.1
ClinPred		0.98	D
GERP RS		4.4
Varity_R		0.43
gMVP		0.83

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.050		Details are displayed if max score is > 0.2

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

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr5-176830368;