19-45179662-C-G

Position:

• chr19-45179662-C-G

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_212550.5(BLOC1S3):​c.366C>G​(p.His122Gln) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000076 in 1,315,768 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/20 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 7.6e-7 (0 hom.)
• Consequence: BLOC1S3 NM_212550.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.160

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 Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.2538041).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
BLOC1S3	NM_212550.5	c.366C>G	p.His122Gln	missense_variant	2/2	ENST00000433642.3	NP_997715.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
BLOC1S3	ENST00000433642.3	c.366C>G	p.His122Gln	missense_variant	2/2	2	NM_212550.5	ENSP00000393840	P1
BLOC1S3	ENST00000587722.1	c.366C>G	p.His122Gln	missense_variant	1/1			ENSP00000468281	P1
MARK4	ENST00000587566.5	c.-276-79327C>G		intron_variant		5		ENSP00000465414
BLOC1S3	ENST00000592910.1			upstream_gene_variant		2		ENSP00000466798

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 7.60e-7 AC: 1 AN: 1315768 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 647940

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: 9.54e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.25
BayesDel_addAF	Benign	-0.12	T
BayesDel_noAF	Benign	-0.42
CADD	Benign	19
DANN	Benign	0.95
DEOGEN2	Uncertain	0.61	D;D
Eigen	Benign	-0.11
Eigen_PC	Benign	-0.19
FATHMM_MKL	Benign	0.43	N
LIST_S2	Benign	0.41	.;T
M_CAP	Uncertain	0.10	D
MetaRNN	Benign	0.25	T;T
MetaSVM	Benign	-0.80	T
MutationAssessor	Benign	1.1	L;L
MutationTaster	Benign	0.52	D;D
PrimateAI	Pathogenic	0.95	D
PROVEAN	Benign	-2.0	N;.
REVEL	Benign	0.27
Sift	Benign	0.24	T;.
Sift4G	Benign	0.28	T;T
Polyphen		1.0	D;D
Vest4		0.18
MutPred		0.15		Gain of helix (P = 0.0425);Gain of helix (P = 0.0425);
MVP		0.32
MPC		1.9
ClinPred		0.63	D
GERP RS		1.3
Varity_R		0.089
gMVP		0.11

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: rs571269735; hg19: chr19-45682920;