rs137852379

Variant names:

Your query was ambiguous. Multiple possible variants found:

Variant summary

Our verdict is Likely benign. The variant received -1 ACMG points: 4P and 5B. PM1PP2PP5BP4BS2

The NM_000132.4(F8):c.121G>T(p.Gly41Cys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000405 in 1,208,566 control chromosomes in the GnomAD database, with no homozygous occurrence. There are 16 hemizygotes in GnomAD. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G41S) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.000045 ( 0 hom., 1 hem., cov: 23)

Exomes 𝑓: 0.000040 ( 0 hom. 15 hem. )

Consequence

F8
NM_000132.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:3U:1

Conservation

PhyloP100: -0.847

Publications

5 publications found

Variant links:

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

F8 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -1 ACMG points.

PM1

In a hotspot region, there are 3 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 3 uncertain in NM_000132.4

PP2

Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 327 curated pathogenic missense variants (we use a threshold of 10). The gene has 28 curated benign missense variants. Gene score misZ: 2.4669 (below the threshold of 3.09). Trascript score misZ: NaN (below the threshold of 3.09). GenCC associations: The gene is linked to hemophilia A, mild hemophilia A, symptomatic form of hemophilia A in female carriers, severe hemophilia A, moderately severe hemophilia A.

PP5

Variant X-155022432-C-A is Pathogenic according to our data. Variant chrX-155022432-C-A is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 10156.

BP4

Computational evidence support a benign effect (MetaRNN=0.17058894). . Strength limited to SUPPORTING due to the PP5.

BS2

High Hemizygotes in GnomAdExome4 at 15 XL gene

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

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	F8	NM_000132.4	MANE Select	c.121G>T	p.Gly41Cys	missense	Exon 1 of 26	NP_000123.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
F8	ENST00000360256.9	TSL:1 MANE Select	c.121G>T	p.Gly41Cys	missense	Exon 1 of 26	ENSP00000353393.4
F8	ENST00000453950.1	TSL:3	c.103G>T	p.Gly35Cys	missense	Exon 2 of 5	ENSP00000389153.1
F8	ENST00000647125.1		n.121G>T		splice_region non_coding_transcript_exon	Exon 1 of 14	ENSP00000496062.1

Frequencies

GnomAD3 genomes

AF:

0.0000451

AC:

AN:

110913

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.000336

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000567

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.000115

AC:

AN:

182769

AF XY:

0.000134

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.000521

Gnomad NFE exome

AF:

0.000134

Gnomad OTH exome

AF:

0.000442

GnomAD4 exome

AF:

0.0000401

AC:

AN:

1097653

Hom.:

Cov.:

AF XY:

0.0000413

AC XY:

AN XY:

363109

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

26400

American (AMR)

AF:

0.00

AC:

AN:

35203

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

19385

East Asian (EAS)

AF:

0.00

AC:

AN:

30200

South Asian (SAS)

AF:

0.00

AC:

AN:

54145

European-Finnish (FIN)

AF:

0.000549

AC:

AN:

40077

Middle Eastern (MID)

AF:

0.00

AC:

AN:

4129

European-Non Finnish (NFE)

AF:

0.0000190

AC:

AN:

842035

Other (OTH)

AF:

0.000130

AC:

AN:

46079

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.480

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.0000451

AC:

AN:

110913

Hom.:

Cov.:

AF XY:

0.0000302

AC XY:

AN XY:

33097

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

30445

American (AMR)

AF:

0.00

AC:

AN:

10451

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

2639

East Asian (EAS)

AF:

0.00

AC:

AN:

3563

South Asian (SAS)

AF:

0.00

AC:

AN:

2518

European-Finnish (FIN)

AF:

0.000336

AC:

AN:

5954

Middle Eastern (MID)

AF:

0.00

AC:

AN:

239

European-Non Finnish (NFE)

AF:

0.0000567

AC:

AN:

52920

Other (OTH)

AF:

0.00

AC:

AN:

1502

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.550

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.0000640

Hom.:

ExAC

AF:

0.000123

AC:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:3Uncertain:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Hereditary factor VIII deficiency disease

Pathogenic:2

Jan 01, 1995

OMIM

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:literature only

Feb 26, 2025

Myriad Genetics, Inc.

Significance:Likely pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

NM_000132.3(F8):c.121G>T(G41C) is a missense variant classified as likely pathogenic in the context of hemophilia A. G41C has been observed in cases with relevant disease (PMID: 7728145, 19473423). Relevant functional assessments of this variant are not available in the literature. G41C has been observed in referenced population frequency databases. In summary, NM_000132.3(F8):c.121G>T(G41C) is a missense variant that has been observed more frequently in cases with the relevant disease than in healthy populations. Please note: this variant was assessed in the context of healthy population screening.

Thrombophilia, X-linked, due to factor 8 defect

Pathogenic:1

May 04, 2022

Mendelics

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

not specified

Uncertain:1

Apr 08, 2025

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Variant summary: F8 c.121G>T (p.Gly41Cys) results in a non-conservative amino acid change in the encoded protein sequence. Three of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 0.00011 in 182769 control chromosomes, including 9 hemizygotes. This frequency is not significantly higher than estimated for a pathogenic variant in F8 causing Factor VIII Deficiency (Hemophilia A) (0.00011 vs 0.0098), allowing no conclusion about variant significance. c.121G>T has been reported in the literature in individuals with Factor VIII Deficiency (Hemophilia A) with variable severity, ranging from mild to severe (example: Preisler_2021, Hallden_2012, Tuddenham_1994). It has also been reported in at-least one individual with repeat normal FVIII levels (example: Andersson_2020). These data indicate that the variant may be associated with disease. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. The following publications have been ascertained in the context of this evaluation (PMID: 32100410, 23020595, 33477601, 7984443). ClinVar contains an entry for this variant (Variation ID: 10156). Based on the evidence outlined above, the variant was classified as VUS-possibly pathogenic.

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.12

BayesDel_addAF

Uncertain

0.091

BayesDel_noAF

Uncertain

0.11

CADD

Benign

5.5

(source)

DANN

Uncertain

0.98

DEOGEN2

Benign

0.40

FATHMM_MKL

Benign

0.013

LIST_S2

Benign

0.43

M_CAP

Pathogenic

0.47

MetaRNN

Benign

0.17

MetaSVM

Uncertain

0.66

MutationAssessor

Benign

1.5

PhyloP100

-0.85

PrimateAI

Benign

0.35

PROVEAN

Benign

-0.84

REVEL

Uncertain

0.54

Sift

Uncertain

0.0040

Sift4G

Benign

0.089

Polyphen

0.98

Vest4

0.12

MVP

0.94

MPC

1.3

ClinPred

0.10

GERP RS

-2.2

PromoterAI

-0.073

Neutral

(source)

Varity_R

0.34

gMVP

0.93

Mutation Taster

=84/16

disease causing (ClinVar)

(source)

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

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over