chrX-154837568-G-A

Position:

• chrX-154837568-G-A

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_Strong BP6_Very_Strong BS1 BS2

The NM_000132.4(F8):​c.*29C>T variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00236 in 1,179,639 control chromosomes in the GnomAD database, including 36 homozygotes. There are 755 hemizygotes in GnomAD. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

• Frequency:
  • Genomes: 𝑓 0.012 (23 hom., 372 hem., cov: 23)
  • Exomes 𝑓: 0.0013 (13 hom. 383 hem.)
• Consequence: F8 NM_000132.4 3_prime_UTR
• Clinical Significance: Benign criteria provided, multiple submitters, no conflicts B:3
• Conservation: PhyloP100: -0.0250

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 -20 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.9).
• BP6: Variant X-154837568-G-A is Benign according to our data. Variant chrX-154837568-G-A is described in ClinVar as [Benign]. Clinvar id is 368114.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.0123 (1370/111482) while in subpopulation AFR AF= 0.0424 (1299/30626). AF 95% confidence interval is 0.0405. There are 23 homozygotes in gnomad4. There are 372 alleles in male gnomad4 subpopulation. Median coverage is 23. This position pass quality control queck.
• BS2: High Homozygotes in GnomAd4 at 23 XL gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
F8	NM_000132.4	c.*29C>T		3_prime_UTR_variant	26/26	ENST00000360256.9	NP_000123.1
F8	NM_019863.3	c.*29C>T		3_prime_UTR_variant	5/5		NP_063916.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
F8	ENST00000360256.9	c.*29C>T		3_prime_UTR_variant	26/26	1	NM_000132.4	ENSP00000353393	P1
F8	ENST00000330287.10	c.*29C>T		3_prime_UTR_variant	5/5	1		ENSP00000327895
F8	ENST00000644698.1	c.*29C>T		3_prime_UTR_variant	6/6			ENSP00000495706

Frequencies

GnomAD3 genomes AF: 0.0123 AC: 1372 AN: 111429 Hom.: 23 Cov.: 23 AF XY: 0.0111 AC XY: 373 AN XY: 33619

Gnomad AFR AF: 0.0426

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00425

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00844

Gnomad NFE AF: 0.0000566

Gnomad OTH AF: 0.0140

GnomAD3 exomes AF: 0.00345 AC: 475 AN: 137610 Hom.: 7 AF XY: 0.00243 AC XY: 103 AN XY: 42344

Gnomad AFR exome AF: 0.0458

Gnomad AMR exome AF: 0.00174

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.000196

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.000813

GnomAD4 exome AF: 0.00132 AC: 1410 AN: 1068157 Hom.: 13 Cov.: 29 AF XY: 0.00111 AC XY: 383 AN XY: 345723

Gnomad4 AFR exome AF: 0.0472

Gnomad4 AMR exome AF: 0.00212

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.000157

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000133

Gnomad4 OTH exome AF: 0.00240

GnomAD4 genome AF: 0.0123 AC: 1370 AN: 111482 Hom.: 23 Cov.: 23 AF XY: 0.0110 AC XY: 372 AN XY: 33682

Gnomad4 AFR AF: 0.0424

Gnomad4 AMR AF: 0.00425

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000566

Gnomad4 OTH AF: 0.0138

Alfa AF: 0.00853 Hom.: 46

Bravo AF: 0.0145

ClinVar

Significance: Benign

Submissions summary: Benign:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Hereditary factor VIII deficiency disease Benign:2

Benign, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jan 12, 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 benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -
Benign, criteria provided, single submitter	clinical testing	ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories	Nov 11, 2019	- -

not provided Benign:1

Benign, criteria provided, single submitter

not provided

Breakthrough Genomics, Breakthrough Genomics

-

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.90
CADD	Benign	1.2
DANN	Benign	0.43

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: rs5986887; hg19: chrX-154065843;