rs137852424

Variant names:

• chrX-154953991-G-A
• rs137852424
• NM_000132.4:c.1804C>T

Your query was ambiguous. Multiple possible variants found:

• chrX-154953991-G-A
• chrX-154953991-G-C
• chrX-154953991-G-T

Variant summary

Our verdict is Pathogenic. The variant received 15 ACMG points: 15P and 0B. PS4 PVS1 PP4_Moderate PM2_Supporting

This summary comes from the ClinGen Evidence Repository: The c.1804C>T (p.Arg602Ter) variant is a nonsense variant that is predicted to introduce a premature stop codon in exon 12 and expected to result in nonsense-mediated mRNA decay. This variant is absent from males in gnomAD v2.1.1 and v3.1.1, which meets criteria for PM2_Supporting. More than 25 patients with moderate-severe hemophilia A are reported in the literature and internal laboratory data, meeting criteria for PS4_Very Strong and PP4_Moderate (PMID:29296726, 18387975, 18691168, 16769589, 8639447, 20331761). In summary, this variant meets criteria to be classified as pathogenic. ACMG/AMP criteria applied, as specified by the Coagulation Factor Deficiency Variant Curation Expert Panel for F8/F9: PVS1, PS4_Very Strong, PP4_Moderate, PM2_Supporting. LINK:https://erepo.genome.network/evrepo/ui/classification/CA255124/MONDO:0010602/071

• Frequency: Genomes: not found (cov: 23)
• Consequence: F8 NM_000132.4 stop_gained
• Clinical Significance: Pathogenic reviewed by expert panel P:6
• Conservation: PhyloP100: 2.16
• Publications: 6 publications found

Genes affected

F8 (HGNC:3546): (coagulation factor VIII) This gene encodes coagulation factor VIII, which participates in the intrinsic pathway of blood coagulation; factor VIII is a cofactor for factor IXa which, in the presence of Ca+2 and phospholipids, converts factor X to the activated form Xa. This gene produces two alternatively spliced transcripts. Transcript variant 1 encodes a large glycoprotein, isoform a, which circulates in plasma and associates with von Willebrand factor in a noncovalent complex. This protein undergoes multiple cleavage events. Transcript variant 2 encodes a putative small protein, isoform b, which consists primarily of the phospholipid binding domain of factor VIIIc. This binding domain is essential for coagulant activity. Defects in this gene results in hemophilia A, a common recessive X-linked coagulation disorder. [provided by RefSeq, Jul 2008]

F8 Gene-Disease associations (from GenCC):

• hemophilia A

  Inheritance: XL Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), ClinGen
• mild hemophilia A

  Inheritance: XL Classification: SUPPORTIVE Submitted by: Orphanet
• moderately severe hemophilia A

  Inheritance: XL Classification: SUPPORTIVE Submitted by: Orphanet
• severe hemophilia A

  Inheritance: XL Classification: SUPPORTIVE Submitted by: Orphanet
• symptomatic form of hemophilia A in female carriers

  Inheritance: XL Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Pathogenic. The variant received 15 ACMG points.

• PVS1: For more information check the summary or visit ClinGen Evidence Repository.
• PS4: For more information check the summary or visit ClinGen Evidence Repository.
• PM2: For more information check the summary or visit ClinGen Evidence Repository.
• PP4: For more information check the summary or visit ClinGen Evidence Repository.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000132.4. 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
	F8	NM_000132.4	MANE Select	c.1804C>T	p.Arg602*	stop_gained	Exon 12 of 26	NP_000123.1	P00451-1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	F8	ENST00000360256.9	TSL:1 MANE Select	c.1804C>T	p.Arg602*	stop_gained	Exon 12 of 26	ENSP00000353393.4	P00451-1
	F8	ENST00000647125.1		n.*1680C>T		non_coding_transcript_exon	Exon 13 of 14	ENSP00000496062.1	A0A2R8Y7J7
	F8	ENST00000647125.1		n.*1680C>T		3_prime_UTR	Exon 13 of 14	ENSP00000496062.1	A0A2R8Y7J7

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 23

Alfa AF: 0.00 Hom.: 0

ClinVar

ClinVar submissions

Significance: Pathogenic

Revision: reviewed by expert panel

Pathogenic	VUS	Benign	Condition
5	-	-	Hereditary factor VIII deficiency disease (5)
1	-	-	Hereditary factor IX deficiency disease (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.74	D
BayesDel_noAF	Pathogenic	0.28
CADD	Pathogenic	34
DANN	Uncertain	1.0
FATHMM_MKL	Benign	0.73	D
PhyloP100		2.2
Vest4		0.91
GERP RS		3.4
Mutation Taster		=0/200	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.070		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: rs137852424; hg19: chrX-154182266; COSMIC: COSV100811708;