NM_021870.3:c.901C>A

Variant names:

• chr4-154606933-G-T
• rs121913087
• NM_021870.3:c.901C>A

Variant summary

Our verdict is Pathogenic. The variant received 10 ACMG points: 10P and 0B. PM2 PM5 PP3_Strong PP5_Moderate

The NM_021870.3(FGG):​c.901C>A​(p.Arg301Ser) 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 Pathogenic (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R301H) has been classified as Likely pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: FGG NM_021870.3 missense
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 4.55
• Publications: 0 publications found

Genes affected

FGG (HGNC:3694): (fibrinogen gamma chain) The protein encoded by this gene is the gamma component of fibrinogen, a blood-borne glycoprotein comprised of three pairs of nonidentical polypeptide chains. Following vascular injury, fibrinogen is cleaved by thrombin to form fibrin which is the most abundant component of blood clots. In addition, various cleavage products of fibrinogen and fibrin regulate cell adhesion and spreading, display vasoconstrictor and chemotactic activities, and are mitogens for several cell types. Mutations in this gene lead to several disorders, including dysfibrinogenemia, hypofibrinogenemia and thrombophilia. Alternative splicing results in transcript variants encoding different isoforms. [provided by RefSeq, Aug 2015]

FGG Gene-Disease associations (from GenCC):

• congenital fibrinogen deficiency

  Inheritance: SD Classification: DEFINITIVE Submitted by: ClinGen
• familial dysfibrinogenemia

  Inheritance: AD Classification: STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Orphanet
• thrombophilia

  Inheritance: AD, AR Classification: STRONG Submitted by: Genomics England PanelApp
• congenital afibrinogenemia

  Inheritance: AR Classification: STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Orphanet
• familial hypofibrinogenemia

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Pathogenic. The variant received 10 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr4-154606932-C-T is described in ClinVar as Pathogenic/Likely_pathogenic. ClinVar VariationId is 16362.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.957
• PP5: Variant 4-154606933-G-T is Pathogenic according to our data. Variant chr4-154606933-G-T is described in ClinVar as Pathogenic. ClinVar VariationId is 2683325.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
FGG	NM_021870.3	c.901C>A	p.Arg301Ser	missense_variant	Exon 8 of 9	ENST00000336098.8	NP_068656.2
FGG	NM_000509.6	c.901C>A	p.Arg301Ser	missense_variant	Exon 8 of 10		NP_000500.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
FGG	ENST00000336098.8	c.901C>A	p.Arg301Ser	missense_variant	Exon 8 of 9	2	NM_021870.3	ENSP00000336829.3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Pathogenic:1

May 04, 2022

Mayo Clinic Laboratories, Mayo Clinic

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

PP3, PM1, PM2, PM5, PS3 -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.95
BayesDel_addAF	Pathogenic	0.34	D
BayesDel_noAF	Pathogenic	0.25
CADD	Pathogenic	29
DANN	Uncertain	1.0
DEOGEN2	Benign	0.34	.;.;T;T
Eigen	Pathogenic	0.74
Eigen_PC	Pathogenic	0.71
FATHMM_MKL	Uncertain	0.94	D
LIST_S2	Uncertain	0.94	D;D;D;D
M_CAP	Uncertain	0.21	D
MetaRNN	Pathogenic	0.96	D;D;D;D
MetaSVM	Uncertain	0.26	D
MutationAssessor	Uncertain	2.0	M;.;M;.
PhyloP100		4.6
PrimateAI	Uncertain	0.54	T
PROVEAN	Uncertain	-2.8	D;D;D;D
REVEL	Pathogenic	0.76
Sift	Uncertain	0.0020	D;D;D;D
Sift4G	Uncertain	0.0060	D;D;D;D
Polyphen		1.0	D;D;D;D
Vest4		0.94
MutPred		0.83		.;Gain of helix (P = 0.0854);.;Gain of helix (P = 0.0854);
MVP		0.90
MPC		0.85
ClinPred		0.98	D
GERP RS		4.9
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.86
gMVP		0.91
Mutation Taster		=0/100	disease causing

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

Other links and lift over

dbSNP: rs121913087; hg19: chr4-155528085;