X-154837567-C-T

Variant summary

Our verdict is Benign. Variant got -10 ACMG points: 0P and 10B. BP4_Strong BP6_Moderate BS2

The NM_000132.4(F8):c.*30G>A variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00019 in 1,184,721 control chromosomes in the GnomAD database, including 2 homozygotes. There are 79 hemizygotes in GnomAD. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★).

• Frequency:
  • Genomes: 𝑓 0.00020 (0 hom., 7 hem., cov: 22)
  • Exomes 𝑓: 0.00019 (2 hom. 72 hem.)
• Consequence: F8 NM_000132.4 3_prime_UTR
• Clinical Significance: Likely benign criteria provided, single submitter B:1
• Conservation: PhyloP100: -0.870

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 Benign. Variant got -10 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.95).
• BP6: Variant X-154837567-C-T is Benign according to our data. Variant chrX-154837567-C-T is described in ClinVar as [Likely_benign]. Clinvar id is 914336.Status of the report is criteria_provided_single_submitter, 1 stars.
• BS2: High Hemizygotes in GnomAd at 7 XL gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
F8	NM_000132.4	c.*30G>A		3_prime_UTR_variant	26/26	ENST00000360256.9
F8	NM_019863.3	c.*30G>A		3_prime_UTR_variant	5/5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
F8	ENST00000360256.9	c.*30G>A		3_prime_UTR_variant	26/26	1	NM_000132.4	P1
F8	ENST00000330287.10	c.*30G>A		3_prime_UTR_variant	5/5	1
F8	ENST00000644698.1	c.*30G>A		3_prime_UTR_variant	6/6

Frequencies

GnomAD3 genomes AF: 0.000197 AC: 22 AN: 111530 Hom.: 0 Cov.: 22 AF XY: 0.000208 AC XY: 7 AN XY: 33700

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00642

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000378

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000566

Gnomad OTH AF: 0.000666

GnomAD3 exomes AF: 0.000392 AC: 56 AN: 142942 Hom.: 2 AF XY: 0.000506 AC XY: 22 AN XY: 43486

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000436

Gnomad ASJ exome AF: 0.00628

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.000323

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000100

Gnomad OTH exome AF: 0.000527

GnomAD4 exome AF: 0.000189 AC: 203 AN: 1073191 Hom.: 2 Cov.: 29 AF XY: 0.000207 AC XY: 72 AN XY: 348103

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000319

Gnomad4 ASJ exome AF: 0.00651

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.000390

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000458

Gnomad4 OTH exome AF: 0.000465

GnomAD4 genome AF: 0.000197 AC: 22 AN: 111530 Hom.: 0 Cov.: 22 AF XY: 0.000208 AC XY: 7 AN XY: 33700

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00642

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000378

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000566

Gnomad4 OTH AF: 0.000666

Alfa AF: 0.00113 Hom.: 8

Bravo AF: 0.000268

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

Hereditary factor VIII deficiency disease Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 13, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as likely benign is not then subjected to further curation. The score for this variant resulted in a classification of likely benign for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.95
Cadd	Benign	0.19
Dann	Benign	0.45

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

LitVar

Other links and lift over

dbSNP: rs376482768; hg19: chrX-154065842; COSMIC: COSV100371876; COSMIC: COSV100371876;