3-187220928-C-T

Position:

• chr3-187220928-C-T

Variant summary

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

The NM_001879.6(MASP1):​c.1909+107G>A variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00147 in 870,548 control chromosomes in the GnomAD database, including 5 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.0052 (2 hom., cov: 31)
  • Exomes 𝑓: 0.00067 (3 hom.)
• Consequence: MASP1 NM_001879.6 intron
• Clinical Significance: Likely benign criteria provided, multiple submitters, no conflicts B:2
• Conservation: PhyloP100: -0.425

Genes affected

MASP1 (HGNC:6901): (MBL associated serine protease 1) This gene encodes a serine protease that functions as a component of the lectin pathway of complement activation. The complement pathway plays an essential role in the innate and adaptive immune response. The encoded protein is synthesized as a zymogen and is activated when it complexes with the pathogen recognition molecules of lectin pathway, the mannose-binding lectin and the ficolins. This protein is not directly involved in complement activation but may play a role as an amplifier of complement activation by cleaving complement C2 or by activating another complement serine protease, MASP-2. The encoded protein is also able to cleave fibrinogen and factor XIII and may may be involved in coagulation. A splice variant of this gene which lacks the serine protease domain functions as an inhibitor of the complement pathway. Alternate splicing results in multiple transcript variants.[provided by RefSeq, Apr 2010]

ACMG classification

Verdict is Benign. Variant got -20 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.88).
• BP6: Variant 3-187220928-C-T is Benign according to our data. Variant chr3-187220928-C-T is described in ClinVar as [Likely_benign]. Clinvar id is 1210531.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 = 0.00524 (798/152340) while in subpopulation AFR AF= 0.0182 (757/41576). AF 95% confidence interval is 0.0171. There are 2 homozygotes in gnomad4. There are 371 alleles in male gnomad4 subpopulation. Median coverage is 31. This position pass quality control queck.
• BS2: High Homozygotes in GnomAd4 at 2 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
MASP1	NM_001879.6	c.1909+107G>A		intron_variant		ENST00000337774.10	NP_001870.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
MASP1	ENST00000337774.10	c.1909+107G>A		intron_variant		1	NM_001879.6	ENSP00000336792	P1

Frequencies

GnomAD3 genomes AF: 0.00522 AC: 795 AN: 152222 Hom.: 2 Cov.: 31

Gnomad AFR AF: 0.0182

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00203

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.000192

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00316

Gnomad NFE AF: 0.0000294

Gnomad OTH AF: 0.00287

GnomAD4 exome AF: 0.000674 AC: 484 AN: 718208 Hom.: 3 AF XY: 0.000514 AC XY: 197 AN XY: 382896

Gnomad4 AFR exome AF: 0.0193

Gnomad4 AMR exome AF: 0.00105

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000573

Gnomad4 SAS exome AF: 0.0000726

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000268

Gnomad4 OTH exome AF: 0.00145

GnomAD4 genome AF: 0.00524 AC: 798 AN: 152340 Hom.: 2 Cov.: 31 AF XY: 0.00498 AC XY: 371 AN XY: 74498

Gnomad4 AFR AF: 0.0182

Gnomad4 AMR AF: 0.00202

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.000193

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000294

Gnomad4 OTH AF: 0.00284

Alfa AF: 0.000558 Hom.: 0

Bravo AF: 0.00612

Asia WGS AF: 0.000289 AC: 1 AN: 3478

ClinVar

Significance: Likely benign

Submissions summary: Benign:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Benign:2

Likely benign, criteria provided, single submitter	not provided	Breakthrough Genomics, Breakthrough Genomics	-	- -
Likely benign, criteria provided, single submitter	clinical testing	GeneDx	Nov 02, 2020	- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.88
CADD	Benign	0.30
DANN	Benign	0.79

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: rs151279132; hg19: chr3-186938716;