rs148950857

Positions:

• chr4-154569794-C-T

Variant summary

Our verdict is Benign. Variant got -21 ACMG points: 0P and 21B. BP4_Strong BP6_Very_Strong BP7 BS1 BS2

The NM_005141.5(FGB):​c.1239C>T​(p.Asp413Asp) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000692 in 1,614,114 control chromosomes in the GnomAD database, including 4 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

• Frequency:
  • Genomes: 𝑓 0.0034 (2 hom., cov: 32)
  • Exomes 𝑓: 0.00041 (2 hom.)
• Consequence: FGB NM_005141.5 synonymous
• Clinical Significance: Benign criteria provided, multiple submitters, no conflicts B:4
• Conservation: PhyloP100: -0.237

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 (HGNC:):

ACMG classification

Verdict is Benign. Variant got -21 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.6).
• BP6: Variant 4-154569794-C-T is Benign according to our data. Variant chr4-154569794-C-T is described in ClinVar as [Benign]. Clinvar id is 259646.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BP7: Synonymous conserved (PhyloP=-0.237 with no splicing effect.
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00339 (516/152282) while in subpopulation AFR AF= 0.0104 (433/41570). AF 95% confidence interval is 0.00961. There are 2 homozygotes in gnomad4. There are 242 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.
• BS2: High Homozygotes in GnomAd4 at 2 SD gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
FGB	NM_005141.5	c.1239C>T	p.Asp413Asp	synonymous_variant	7/8	ENST00000302068.9	NP_005132.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
FGB	ENST00000302068.9	c.1239C>T	p.Asp413Asp	synonymous_variant	7/8	1	NM_005141.5	ENSP00000306099.4
FGB	ENST00000509493.1	c.582C>T	p.Asp194Asp	synonymous_variant	5/6	5		ENSP00000426757.1
FGB	ENST00000502545.5	n.939+487C>T		intron_variant		5

Frequencies

GnomAD3 genomes AF: 0.00340 AC: 518 AN: 152164 Hom.: 2 Cov.: 32

Gnomad AFR AF: 0.0105

Gnomad AMI AF: 0.0274

Gnomad AMR AF: 0.00216

Gnomad ASJ AF: 0.00259

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000735

Gnomad OTH AF: 0.00525

GnomAD3 exomes AF: 0.000996 AC: 250 AN: 250934 Hom.: 1 AF XY: 0.000708 AC XY: 96 AN XY: 135642

Gnomad AFR exome AF: 0.0115

Gnomad AMR exome AF: 0.00119

Gnomad ASJ exome AF: 0.000994

Gnomad EAS exome AF: 0.000109

Gnomad SAS exome AF: 0.0000980

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000353

Gnomad OTH exome AF: 0.000490

GnomAD4 exome AF: 0.000411 AC: 601 AN: 1461832 Hom.: 2 Cov.: 33 AF XY: 0.000359 AC XY: 261 AN XY: 727218

Gnomad4 AFR exome AF: 0.0111

Gnomad4 AMR exome AF: 0.00127

Gnomad4 ASJ exome AF: 0.000957

Gnomad4 EAS exome AF: 0.0000756

Gnomad4 SAS exome AF: 0.000128

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000674

Gnomad4 OTH exome AF: 0.000960

GnomAD4 genome AF: 0.00339 AC: 516 AN: 152282 Hom.: 2 Cov.: 32 AF XY: 0.00325 AC XY: 242 AN XY: 74456

Gnomad4 AFR AF: 0.0104

Gnomad4 AMR AF: 0.00216

Gnomad4 ASJ AF: 0.00259

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000735

Gnomad4 OTH AF: 0.00520

Alfa AF: 0.00177 Hom.: 1

Bravo AF: 0.00392

EpiCase AF: 0.000164

EpiControl AF: 0.000178

ClinVar

Significance: Benign

Submissions summary: Benign:4

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Benign:2

Benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 31, 2024	- -
Benign, criteria provided, single submitter	not provided	Breakthrough Genomics, Breakthrough Genomics	-	- -

not specified Benign:1

Benign, criteria provided, single submitter

clinical testing

PreventionGenetics, part of Exact Sciences

-

- -

Congenital afibrinogenemia Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

May 08, 2017

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). No publications were found based on this search. Allele frequency data from public databases was too high to be consistent with this variant causing disease. Therefore, this variant is classified as benign. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.60
CADD	Benign	0.22
DANN	Benign	0.42
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		Details are displayed if max score is > 0.2

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

Publications

LitVar

Other links and lift over

dbSNP: rs148950857; hg19: chr4-155490946; COSMIC: COSV100122552; COSMIC: COSV100122552;