chr19-45179382-G-A

Position:

• chr19-45179382-G-A

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_212550.5(BLOC1S3):​c.86G>A​(p.Arg29His) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 13/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R29P) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: BLOC1S3 NM_212550.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.0560

Genes affected

BLOC1S3 (HGNC:20914): (biogenesis of lysosomal organelles complex 1 subunit 3) This gene encodes a protein that is a component of the BLOC1 multi-subunit protein complex. This complex is necessary for the biogenesis of specialized organelles of the endosomal-lysosomal system, including platelet dense granules and melanosomes. Mutations in this gene cause Hermansky-Pudlak syndrome 8, a disease characterized by lysosomal storage defects, bleeding due to platelet storage pool deficiency, and oculocutaneous albinism. [provided by RefSeq, Jul 2008]

MARK4 (HGNC:13538): (microtubule affinity regulating kinase 4) This gene encodes a member of the microtubule affinity-regulating kinase family. These protein kinases phosphorylate microtubule-associated proteins and regulate the transition between stable and dynamic microtubules. The encoded protein is associated with the centrosome throughout mitosis and may be involved in cell cycle control. Expression of this gene is a potential marker for cancer, and the encoded protein may also play a role in Alzheimer's disease. Pseudogenes of this gene are located on both the short and long arm of chromosome 3. Alternatively spliced transcript variants encoding multiple isoforms have been observed for this gene. [provided by RefSeq, Dec 2010]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.051520318).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
BLOC1S3	NM_212550.5	c.86G>A	p.Arg29His	missense_variant	2/2	ENST00000433642.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
BLOC1S3	ENST00000433642.3	c.86G>A	p.Arg29His	missense_variant	2/2	2	NM_212550.5	P1
BLOC1S3	ENST00000587722.1	c.86G>A	p.Arg29His	missense_variant	1/1			P1
MARK4	ENST00000587566.5	c.-276-79607G>A		intron_variant		5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1429006 Hom.: 0 Cov.: 30 AF XY: 0.00 AC XY: 0 AN XY: 710626

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.0000491

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 01, 2022

This sequence change replaces arginine, which is basic and polar, with histidine, which is basic and polar, at codon 29 of the BLOC1S3 protein (p.Arg29His). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with BLOC1S3-related conditions. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.089
BayesDel_addAF	Benign	-0.26	T
BayesDel_noAF	Benign	-0.61
CADD	Benign	14
DANN	Uncertain	0.98
DEOGEN2	Benign	0.16	T;T
Eigen	Benign	-1.2
Eigen_PC	Benign	-1.1
FATHMM_MKL	Benign	0.052	N
LIST_S2	Benign	0.49	.;T
M_CAP	Benign	0.0037	T
MetaRNN	Benign	0.052	T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.0	N;N
MutationTaster	Benign	1.0	N;N
PrimateAI	Uncertain	0.73	T
PROVEAN	Benign	-0.40	N;.
REVEL	Benign	0.025
Sift	Benign	0.18	T;.
Sift4G	Benign	0.19	T;T
Polyphen		0.030	B;B
Vest4		0.063
MutPred		0.12		Gain of glycosylation at S30 (P = 0.1026);Gain of glycosylation at S30 (P = 0.1026);
MVP		0.095
MPC		1.1
ClinPred		0.083	T
GERP RS		0.24
Varity_R		0.031
gMVP		0.20

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: rs370018943; hg19: chr19-45682640;