19-55014278-GTTTTT-GTTTT

Variant names:

• chr19-55014278-GT-G
• NM_001083899.2:c.1666delA

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PVS1_Strong PM2

The NM_001083899.2(GP6):​c.1666delA​(p.Thr556HisfsTer4) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000254 in 1,181,132 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000025 (0 hom.)
• Consequence: GP6 NM_001083899.2 frameshift
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.268

Genes affected

GP6 (HGNC:14388): (glycoprotein VI platelet) This gene encodes a platelet membrane glycoprotein of the immunoglobulin superfamily. The encoded protein is a receptor for collagen and plays a critical role in collagen-induced platelet aggregation and thrombus formation. The encoded protein forms a complex with the Fc receptor gamma-chain that initiates the platelet activation signaling cascade upon collagen binding. Mutations in this gene are a cause of platelet-type bleeding disorder-11 (BDPLT11). Alternatively spliced transcript variants encoding multiple isoforms have been observed for this gene. [provided by RefSeq, Dec 2011]

GP6-AS1 (HGNC:55305): (GP6 antisense RNA 1)

ACMG classification

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most exon, not predicted to undergo nonsense mediated mRNA decay. Fraction of 0.106 CDS is truncated, and there are 0 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GP6	NM_001083899.2	c.1666delA	p.Thr556HisfsTer4	frameshift_variant	Exon 8 of 8	ENST00000310373.7	NP_001077368.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GP6	ENST00000310373.7	c.1666delA	p.Thr556HisfsTer4	frameshift_variant	Exon 8 of 8	1	NM_001083899.2	ENSP00000308782.3
GP6	ENST00000417454	c.*642delA		3_prime_UTR_variant	Exon 8 of 8	1		ENSP00000394922.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000254 AC: 3 AN: 1181132 Hom.: 0 Cov.: 17 AF XY: 0.00000333 AC XY: 2 AN XY: 600820

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000260

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.0000219

Gnomad4 NFE exome AF: 0.00000116

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr19-55525646;