X-154906421-A-G

Position:

• chrX-154906421-A-G

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM2 PP3_Moderate PP5

The NM_000132.4(F8):​c.5372T>C​(p.Met1791Thr) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Pathogenic (no stars).

• Frequency: Genomes: not found (cov: 23)
• Consequence: F8 NM_000132.4 missense, splice_region
• Scores: Splicing: ADA: 0.00005751
• Clinical Significance: Pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 1.07

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.922
• PP5: Variant X-154906421-A-G is Pathogenic according to our data. Variant chrX-154906421-A-G is described in ClinVar as [Pathogenic]. Clinvar id is 10148.Status of the report is no_assertion_criteria_provided, 0 stars. Variant chrX-154906421-A-G is described in Lovd as [Likely_pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
F8	NM_000132.4	c.5372T>C	p.Met1791Thr	missense_variant, splice_region_variant	15/26	ENST00000360256.9	NP_000123.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
F8	ENST00000360256.9	c.5372T>C	p.Met1791Thr	missense_variant, splice_region_variant	15/26	1	NM_000132.4	ENSP00000353393	P1

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD4 exome Cov.: 28

GnomAD4 genome Cov.: 23

Bravo AF: 0.00000756

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: no assertion criteria provided

Submissions by phenotype

Hereditary factor VIII deficiency disease Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

May 01, 1992

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.12
BayesDel_addAF	Pathogenic	0.26	D
BayesDel_noAF	Uncertain	0.13
CADD	Benign	18
DANN	Benign	0.83
DEOGEN2	Uncertain	0.66	D
FATHMM_MKL	Benign	0.58	D
LIST_S2	Benign	0.62	T
M_CAP	Pathogenic	0.41	D
MetaRNN	Pathogenic	0.92	D
MetaSVM	Uncertain	0.20	D
MutationAssessor	Benign	0.38	N
MutationTaster	Benign	0.94	N
PrimateAI	Benign	0.37	T
PROVEAN	Benign	-2.2	N
REVEL	Uncertain	0.59
Sift	Benign	0.26	T
Sift4G	Benign	0.12	T
Polyphen		0.0040	B
Vest4		0.69
MutPred		0.86		Loss of catalytic residue at M1791 (P = 0.0142);
MVP		0.99
MPC		0.052
ClinPred		0.10	T
GERP RS		1.8
Varity_R		0.21
gMVP		0.97

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.000058
dbscSNV1_RF	Benign	0.0020
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

Publications

LitVar

Other links and lift over

dbSNP: rs137852375; hg19: chrX-154134696;