Genetic Variant SIGLEC15:p.Arg128His (chr18-45837783-G-A) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_213602.3(SIGLEC15):c.383G>A(p.Arg128His) variant causes a missense change. The variant allele was found at a frequency of 0.000000729 in 1,371,468 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R128P) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 7.3e-7 ( 0 hom. )

Consequence

SIGLEC15
NM_213602.3 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 3.84

Publications

0 publications found

Variant links:

Genes affected

SIGLEC15 (HGNC:27596): (sialic acid binding Ig like lectin 15) Predicted to be involved in regulation of actin cytoskeleton organization; regulation of bone resorption; and regulation of osteoclast development. Predicted to be integral component of membrane. Predicted to be part of protein-containing complex. Predicted to be active in plasma membrane. [provided by Alliance of Genome Resources, Apr 2022]

SIGLEC15 links:

EPG5 (HGNC:29331): (ectopic P-granules 5 autophagy tethering factor) This gene encodes a large coiled coil domain-containing protein that functions in autophagy during starvation conditions. Mutations in this gene cause Vici syndrome. [provided by RefSeq, Aug 2015]

EPG5 Gene-Disease associations (from GenCC):

Vici syndrome
Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, Orphanet, G2P

EPG5 links:

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SIGLEC15	NM_213602.3 link	c.383G>A	p.Arg128His	missense_variant	Exon 3 of 6	ENST00000389474.8	NP_998767.1	Q6ZMC9-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SIGLEC15	ENST00000389474.8 link	c.383G>A	p.Arg128His	missense_variant	Exon 3 of 6	1	NM_213602.3	ENSP00000374125.2		Q6ZMC9-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

7.29e-7

AC:

AN:

1371468

Hom.:

Cov.:

AF XY:

0.00000147

AC XY:

AN XY:

678088

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.0000355

AC:

AN:

28208

American (AMR)

AF:

0.00

AC:

AN:

36558

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

24334

East Asian (EAS)

AF:

0.00

AC:

AN:

32592

South Asian (SAS)

AF:

0.00

AC:

AN:

78500

European-Finnish (FIN)

AF:

0.00

AC:

AN:

33712

Middle Eastern (MID)

AF:

0.00

AC:

AN:

4334

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1076206

Other (OTH)

AF:

0.00

AC:

AN:

57024

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.375

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.15

BayesDel_addAF

Benign

0.0041

BayesDel_noAF

Benign

-0.23

CADD

Pathogenic

(source)

DANN

Pathogenic

1.0

DEOGEN2

Benign

0.011

Eigen

Uncertain

0.44

Eigen_PC

Uncertain

0.41

FATHMM_MKL

Uncertain

0.91

LIST_S2

Benign

0.67

M_CAP

Uncertain

0.21

MetaRNN

Uncertain

0.56

MetaSVM

Benign

-0.51

MutationAssessor

Benign

1.7

PhyloP100

3.8

PrimateAI

Pathogenic

0.88

PROVEAN

Benign

-2.1

REVEL

Uncertain

0.34

Sift

Benign

0.033

Sift4G

Uncertain

0.0080

Polyphen

1.0

Vest4

0.28

MutPred

0.70

Loss of MoRF binding (P = 0.0168);

MVP

0.70

MPC

1.5

ClinPred

0.97

GERP RS

3.7

PromoterAI

-0.051

Neutral

(source)

Varity_R

0.19

gMVP

0.59

Mutation Taster

=74/26

polymorphism

(source)

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

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chr18-45837783-G-A

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over