NM_000505.4:c.983C>T

Variant names:

• chr5-177404231-G-A
• NM_000505.4:c.983C>T

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PM5

The NM_000505.4(F12):​c.983C>T​(p.Thr328Met) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000138 in 1,449,748 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. T328K) has been classified as Pathogenic.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: F12 NM_000505.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 2.61

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.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr5-177404231-G-T is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
F12	NM_000505.4	c.983C>T	p.Thr328Met	missense_variant	Exon 9 of 14	ENST00000253496.4	NP_000496.2
F12	XM_011534462.3	c.647C>T	p.Thr216Met	missense_variant	Exon 6 of 11		XP_011532764.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
F12	ENST00000253496.4	c.983C>T	p.Thr328Met	missense_variant	Exon 9 of 14	1	NM_000505.4	ENSP00000253496.3

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000138 AC: 2 AN: 1449748 Hom.: 0 Cov.: 37 AF XY: 0.00000278 AC XY: 2 AN XY: 719534

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: 0.0000117

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 9.05e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.11
BayesDel_addAF	Uncertain	0.032	T
BayesDel_noAF	Benign	-0.19
CADD	Benign	23
DANN	Uncertain	1.0
DEOGEN2	Benign	0.081	T
Eigen	Benign	-0.021
Eigen_PC	Benign	-0.17
FATHMM_MKL	Uncertain	0.76	D
LIST_S2	Benign	0.54	T
M_CAP	Uncertain	0.15	D
MetaRNN	Uncertain	0.46	T
MetaSVM	Uncertain	-0.12	T
MutationAssessor	Benign	0.0	N
PrimateAI	Benign	0.42	T
PROVEAN	Benign	-0.94	N
REVEL	Uncertain	0.34
Sift	Uncertain	0.011	D
Sift4G	Benign	0.11	T
Polyphen		1.0	D
Vest4		0.41
MutPred		0.42		Loss of glycosylation at T328 (P = 0.0013);
MVP		0.95
MPC		1.6
ClinPred		0.71	D
GERP RS		4.1
Varity_R		0.067
gMVP		0.61

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.030		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: chr5-176831232; COSMIC: COSV53691503; COSMIC: COSV53691503;