chr15-55319259-G-A

Variant names:

• chr15-55319259-G-A
• rs373610042
• NM_004855.5:c.9G>A

Variant summary

Our verdict is Likely benign. The variant received -5 ACMG points: 2P and 7B. PM2 BP4_Strong BP6_Moderate BP7

The NM_004855.5(PIGB):​c.9G>A​(p.Arg3Arg) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000255 in 1,605,982 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★).

• Frequency:
  • Genomes: 𝑓 0.000039 (0 hom., cov: 32)
  • Exomes 𝑓: 0.000024 (0 hom.)
• Consequence: PIGB NM_004855.5 synonymous
• Clinical Significance: Likely benign criteria provided, single submitter B:1
• Conservation: PhyloP100: -0.422
• Publications: 1 publications found

Genes affected

PIGB (HGNC:8959): (phosphatidylinositol glycan anchor biosynthesis class B) This gene encodes a transmembrane protein that is located in the endoplasmic reticulum and is involved in GPI-anchor biosynthesis. The glycosylphosphatidylinositol (GPI) anchor is a glycolipid found on many blood cells and serves to anchor proteins to the cell surface. This gene is thought to encode a member of a family of dolichol-phosphate-mannose (Dol-P-Man) dependent mannosyltransferases. [provided by RefSeq, Jul 2008]

PIGBOS1 (HGNC:50696): (PIGB opposite strand 1) Involved in regulation of endoplasmic reticulum unfolded protein response. Is integral component of mitochondrial outer membrane. [provided by Alliance of Genome Resources, Apr 2022]

RAB27A (HGNC:9766): (RAB27A, member RAS oncogene family) The protein encoded by this gene belongs to the small GTPase superfamily, Rab family. The protein is membrane-bound and may be involved in protein transport and small GTPase mediated signal transduction. Mutations in this gene are associated with Griscelli syndrome type 2. Alternative splicing occurs at this locus and four transcript variants encoding the same protein have been identified. [provided by RefSeq, Jul 2008]

RAB27A Gene-Disease associations (from GenCC):

• Griscelli syndrome type 2

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: ClinGen, Labcorp Genetics (formerly Invitae), Orphanet

ACMG classification

Our verdict: Likely_benign. The variant received -5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.77).
• BP6: Variant 15-55319259-G-A is Benign according to our data. Variant chr15-55319259-G-A is described in ClinVar as [Likely_benign]. Clinvar id is 1991731.Status of the report is criteria_provided_single_submitter, 1 stars.
• BP7: Synonymous conserved (PhyloP=-0.422 with no splicing effect.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PIGB	NM_004855.5	c.9G>A	p.Arg3Arg	synonymous_variant	Exon 1 of 12	ENST00000164305.10	NP_004846.4
PIGBOS1	NM_001308421.2	c.-471C>T		upstream_gene_variant		ENST00000436697.3	NP_001295350.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PIGB	ENST00000164305.10	c.9G>A	p.Arg3Arg	synonymous_variant	Exon 1 of 12	1	NM_004855.5	ENSP00000164305.5
PIGB	ENST00000566999.5	c.9G>A	p.Arg3Arg	synonymous_variant	Exon 1 of 6	3		ENSP00000456531.1
PIGBOS1	ENST00000436697.3	c.-471C>T		upstream_gene_variant		2	NM_001308421.2	ENSP00000484893.1

Frequencies

GnomAD3 genomes AF: 0.0000394 AC: 6 AN: 152230 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000241

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.000188

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000441

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.0000257 AC: 6 AN: 233394 AF XY: 0.0000158

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.000194

Gnomad NFE exome AF: 0.0000189

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000241 AC: 35 AN: 1453752 Hom.: 0 Cov.: 31 AF XY: 0.0000235 AC XY: 17 AN XY: 722118

African (AFR) AF: 0.0000300 AC: 1 AN: 33370

American (AMR) AF: 0.00 AC: 0 AN: 43576

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25770

East Asian (EAS) AF: 0.00 AC: 0 AN: 39508

South Asian (SAS) AF: 0.00 AC: 0 AN: 84104

European-Finnish (FIN) AF: 0.000189 AC: 10 AN: 52784

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5744

European-Non Finnish (NFE) AF: 0.0000216 AC: 24 AN: 1108850

Other (OTH) AF: 0.00 AC: 0 AN: 60046

GnomAD4 genome AF: 0.0000394 AC: 6 AN: 152230 Hom.: 0 Cov.: 32 AF XY: 0.0000538 AC XY: 4 AN XY: 74376

African (AFR) AF: 0.0000241 AC: 1 AN: 41450

American (AMR) AF: 0.00 AC: 0 AN: 15286

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3468

East Asian (EAS) AF: 0.00 AC: 0 AN: 5200

South Asian (SAS) AF: 0.00 AC: 0 AN: 4838

European-Finnish (FIN) AF: 0.000188 AC: 2 AN: 10626

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 316

European-Non Finnish (NFE) AF: 0.0000441 AC: 3 AN: 68044

Other (OTH) AF: 0.00 AC: 0 AN: 2094

Alfa AF: 0.0000282 Hom.: 0

Bravo AF: 0.0000227

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Benign:1

Jan 24, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.77
CADD	Benign	5.8
DANN	Benign	0.81
PhyloP100		-0.42
PromoterAI		-0.13	Neutral

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

Other links and lift over

dbSNP: rs373610042; hg19: chr15-55611457; COSMIC: COSV51241362; COSMIC: COSV51241362;