chr4-154589513-C-G

Variant names:

• chr4-154589513-C-G
• rs121909607
• NM_021871.4:c.104G>C

Variant summary

Our verdict is Likely pathogenic. The variant received 9 ACMG points: 9P and 0B. PM1 PM2 PM5 PP3 PP5_Moderate

The NM_021871.4(FGA):​c.104G>C​(p.Arg35Pro) 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. R35N) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: FGA NM_021871.4 missense
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 5.19
• Publications: 25 publications found

Genes affected

FGA (HGNC:3661): (fibrinogen alpha chain) This gene encodes the alpha subunit of the coagulation factor fibrinogen, which is a component of the blood clot. Following vascular injury, the encoded preproprotein is proteolytically processed by thrombin during the conversion of fibrinogen to fibrin. Mutations in this gene lead to several disorders, including dysfibrinogenemia, hypofibrinogenemia, afibrinogenemia and renal amyloidosis. Alternative splicing results in multiple transcript variants, at least one of which encodes an isoform that undergoes proteolytic processing. [provided by RefSeq, Jan 2016]

FGA Gene-Disease associations (from GenCC):

• familial dysfibrinogenemia

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, Ambry Genetics, Labcorp Genetics (formerly Invitae)
• congenital afibrinogenemia

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, Ambry Genetics, Labcorp Genetics (formerly Invitae)
• congenital fibrinogen deficiency

  Inheritance: SD Classification: DEFINITIVE Submitted by: ClinGen
• familial visceral amyloidosis

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

  Inheritance: AR, AD Classification: STRONG Submitted by: Genomics England PanelApp
• AFib amyloidosis

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• familial hypofibrinogenemia

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ENSG00000306549 (HGNC:):

ACMG classification

Our verdict: Likely_pathogenic. The variant received 9 ACMG points.

• PM1: In a hotspot region, there are 4 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 7 uncertain in NM_021871.4
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr4-154589513-C-T is described in ClinVar as Pathogenic. ClinVar VariationId is 16404.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.824
• PP5: Variant 4-154589513-C-G is Pathogenic according to our data. Variant chr4-154589513-C-G is described in ClinVar as Pathogenic. ClinVar VariationId is 627199.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
FGA	NM_021871.4	c.104G>C	p.Arg35Pro	missense_variant	Exon 2 of 5	ENST00000403106.8	NP_068657.1
FGA	NM_000508.5	c.104G>C	p.Arg35Pro	missense_variant	Exon 2 of 6		NP_000499.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
FGA	ENST00000403106.8	c.104G>C	p.Arg35Pro	missense_variant	Exon 2 of 5	1	NM_021871.4	ENSP00000385981.3
FGA	ENST00000651975.2	c.104G>C	p.Arg35Pro	missense_variant	Exon 2 of 6			ENSP00000498441.1
ENSG00000306549	ENST00000819308.1	n.137+2749C>G		intron_variant	Intron 1 of 1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Hypofibrinogenemia Pathogenic:1

Feb 01, 2019

NIHR Bioresource Rare Diseases, University of Cambridge

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: research

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.86
BayesDel_addAF	Pathogenic	0.36	D
BayesDel_noAF	Pathogenic	0.28
CADD	Pathogenic	26
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.89	D;.;.
Eigen	Pathogenic	0.69
Eigen_PC	Uncertain	0.63
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Benign	0.80	T;T;T
M_CAP	Uncertain	0.26	D
MetaRNN	Pathogenic	0.82	D;D;D
MetaSVM	Uncertain	0.26	D
MutationAssessor	Uncertain	2.7	M;M;.
PhyloP100		5.2
PrimateAI	Uncertain	0.53	T
PROVEAN	Pathogenic	-4.5	D;D;.
REVEL	Uncertain	0.46
Sift	Pathogenic	0.0	D;D;.
Sift4G	Pathogenic	0.0	D;D;D
Polyphen		1.0	D;D;.
Vest4		0.82
MutPred		0.42		Loss of methylation at R35 (P = 0.0239);Loss of methylation at R35 (P = 0.0239);Loss of methylation at R35 (P = 0.0239);
MVP		0.91
MPC		0.21
ClinPred		1.0	D
GERP RS		5.6
Varity_R		0.98
gMVP		0.67
Mutation Taster		=10/90	disease causing (ClinVar)

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: rs121909607; hg19: chr4-155510665;