4-154565318-T-G

Variant names:

• chr4-154565318-T-G
• rs2227402
• NM_005141.5:c.115-490T>G

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_005141.5(FGB):​c.115-490T>G variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: not found (cov: 32)
• Consequence: FGB NM_005141.5 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.677
• Publications: 4 publications found

Genes affected

FGB (HGNC:3662): (fibrinogen beta chain) The protein encoded by this gene is the beta 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. Fibrinogen serves key roles in hemostasis and antimicrobial host defense. Mutations in this gene lead to several disorders, including afibrinogenemia, dysfibrinogenemia, hypodysfibrinogenemia and thrombotic tendency. [provided by RefSeq, Aug 2020]

FGB Gene-Disease associations (from GenCC):

• congenital fibrinogen deficiency

  Inheritance: SD Classification: DEFINITIVE Submitted by: ClinGen
• congenital afibrinogenemia

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

  Inheritance: AR, AD Classification: STRONG Submitted by: Genomics England PanelApp
• familial dysfibrinogenemia

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

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.82).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_005141.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	FGB	NM_005141.5	MANE Select	c.115-490T>G		intron	N/A	NP_005132.2	P02675
	FGB	NM_001382763.1		c.115-490T>G		intron	N/A	NP_001369692.1
	FGB	NM_001382765.1		c.115-490T>G		intron	N/A	NP_001369694.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	FGB	ENST00000302068.9	TSL:1 MANE Select	c.115-490T>G		intron	N/A	ENSP00000306099.4	P02675
	FGB	ENST00000497097.5	TSL:1	n.122-490T>G		intron	N/A
	FGB	ENST00000904942.1		c.115-490T>G		intron	N/A	ENSP00000575001.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 0

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 462

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.82
CADD	Benign	5.6
DANN	Benign	0.50
PhyloP100		0.68

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: rs2227402; hg19: chr4-155486470;