1-197040740-GAAC-G

Variant summary

Our verdict is Benign. Variant got -9 ACMG points: 0P and 9B. BP6 BS1 BS2

The NM_001994.3(F13B):c.1739-8_1739-6del variant causes a splice region, splice polypyrimidine tract, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00186 in 1,593,662 control chromosomes in the GnomAD database, including 5 homozygotes. 1/1 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: 𝑓 0.0018 (0 hom., cov: 32)
  • Exomes 𝑓: 0.0019 (5 hom.)
• Consequence: F13B NM_001994.3 splice_region, splice_polypyrimidine_tract, intron
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1 B:2
• Conservation: PhyloP100: 0.946

Genes affected

F13B (HGNC:3534): (coagulation factor XIII B chain) This gene encodes coagulation factor XIII B subunit. Coagulation factor XIII is the last zymogen to become activated in the blood coagulation cascade. Plasma factor XIII is a heterotetramer composed of 2 A subunits and 2 B subunits. The A subunits have catalytic function, and the B subunits do not have enzymatic activity and may serve as a plasma carrier molecules. Platelet factor XIII is comprised only of 2 A subunits, which are identical to those of plasma origin. Upon activation by the cleavage of the activation peptide by thrombin and in the presence of calcium ion, the plasma factor XIII dissociates its B subunits and yields the same active enzyme, factor XIIIa, as platelet factor XIII. This enzyme acts as a transglutaminase to catalyze the formation of gamma-glutamyl-epsilon-lysine crosslinking between fibrin molecules, thus stabilizing the fibrin clot. Factor XIII deficiency is classified into two categories: type I deficiency, characterized by the lack of both the A and B subunits; and type II deficiency, characterized by the lack of the A subunit alone. These defects can result in a lifelong bleeding tendency, defective wound healing, and habitual abortion. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Benign. Variant got -9 ACMG points.

• BP6: Variant 1-197040740-GAAC-G is Benign according to our data. Variant chr1-197040740-GAAC-G is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 294571.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=2, Uncertain_significance=1}.
• BS1: Variant frequency is greater than expected in population amr. gnomad4 allele frequency = 0.00184 (280/151848) while in subpopulation AMR AF= 0.00664 (101/15222). AF 95% confidence interval is 0.00559. There are 0 homozygotes in gnomad4. There are 154 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.
• BS2: High Homozygotes in GnomAdExome at 2 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
F13B	NM_001994.3	c.1739-8_1739-6del		splice_region_variant, splice_polypyrimidine_tract_variant, intron_variant		ENST00000367412.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
F13B	ENST00000367412.2	c.1739-8_1739-6del		splice_region_variant, splice_polypyrimidine_tract_variant, intron_variant		1	NM_001994.3	P1
F13B	ENST00000649282.1	c.494-8_494-6del		splice_region_variant, splice_polypyrimidine_tract_variant, intron_variant
F13B	ENST00000490002.1	n.150-8_150-6del		splice_region_variant, splice_polypyrimidine_tract_variant, intron_variant, non_coding_transcript_variant		3

Frequencies

GnomAD3 genomes AF: 0.00185 AC: 280 AN: 151730 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.000630

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00664

Gnomad ASJ AF: 0.000289

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00208

Gnomad OTH AF: 0.00527

GnomAD3 exomes AF: 0.00163 AC: 385 AN: 236506 Hom.: 2 AF XY: 0.00155 AC XY: 198 AN XY: 127878

Gnomad AFR exome AF: 0.000522

Gnomad AMR exome AF: 0.00470

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.0000471

Gnomad NFE exome AF: 0.00196

Gnomad OTH exome AF: 0.00241

GnomAD4 exome AF: 0.00187 AC: 2692 AN: 1441814 Hom.: 5 AF XY: 0.00181 AC XY: 1296 AN XY: 717694

Gnomad4 AFR exome AF: 0.000396

Gnomad4 AMR exome AF: 0.00434

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.0000942

Gnomad4 NFE exome AF: 0.00219

Gnomad4 OTH exome AF: 0.00134

GnomAD4 genome AF: 0.00184 AC: 280 AN: 151848 Hom.: 0 Cov.: 32 AF XY: 0.00207 AC XY: 154 AN XY: 74220

Gnomad4 AFR AF: 0.000628

Gnomad4 AMR AF: 0.00664

Gnomad4 ASJ AF: 0.000289

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.00208

Gnomad4 OTH AF: 0.00521

Alfa AF: 0.00142 Hom.: 0

Bravo AF: 0.00219

Asia WGS AF: 0.000289 AC: 1 AN: 3474

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1 Benign:2

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not provided Benign:2

Likely benign, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Mar 01, 2022	F13B: BP4 -
Likely benign, criteria provided, single submitter	clinical testing	Invitae	Dec 31, 2019	- -

Factor XIII, b subunit, deficiency of Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jun 14, 2016

- -

Computational scores

Source: dbNSFP v4.3

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: rs556380704; hg19: chr1-197009870;