Genetic Variant NM_012388.4:c.182T>G (chr15-45592234-T-G) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

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

The NM_012388.4(BLOC1S6):c.182T>G(p.Leu61Trp) variant causes a missense change. The variant allele was found at a frequency of 0.00000867 in 1,614,152 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.000026 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000068 ( 0 hom. )

Consequence

BLOC1S6
NM_012388.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:2

Conservation

PhyloP100: 5.75

Variant links:

Genes affected

BLOC1S6 (HGNC:8549): (biogenesis of lysosomal organelles complex 1 subunit 6) The protein encoded by this gene may play a role in intracellular vesicle trafficking. It interacts with Syntaxin 13 which mediates intracellular membrane fusion. Mutations in this gene cause symptoms associated with Hermansky-Pudlak syndrome-9. Alternative splicing results in multiple transcript variants. A pseudogene related to this gene is located on the X chromosome. [provided by RefSeq, Aug 2015]

BLOC1S6 links:

ENSG00000260170 (HGNC:):

ENSG00000260170 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 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
BLOC1S6	NM_012388.4 link	c.182T>G	p.Leu61Trp	missense_variant	Exon 2 of 5	ENST00000220531.9	NP_036520.1	Q9UL45-1B3KY40

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
BLOC1S6	ENST00000220531.9 link	c.182T>G	p.Leu61Trp	missense_variant	Exon 2 of 5	1	NM_012388.4	ENSP00000220531.4		Q9UL45-1
ENSG00000260170	ENST00000564080.1 link	c.-18+4709T>G		intron_variant	Intron 1 of 5	3		ENSP00000455047.1		H3BNX3

Frequencies

GnomAD3 genomes

AF:

0.0000263

AC:

AN:

152232

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000192

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.000957

GnomAD4 exome

AF:

0.00000684

AC:

AN:

1461802

Hom.:

Cov.:

AF XY:

0.00000550

AC XY:

AN XY:

727200

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000252

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000719

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

AF:

0.0000263

AC:

AN:

152350

Hom.:

Cov.:

AF XY:

0.0000403

AC XY:

AN XY:

74504

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.000193

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.000947

Bravo

AF:

0.0000189

Asia WGS

AF:

0.000577

AC:

AN:

3478

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Hermansky-Pudlak syndrome 9

Uncertain:1

Aug 16, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces leucine, which is neutral and non-polar, with tryptophan, which is neutral and slightly polar, at codon 61 of the BLOC1S6 protein (p.Leu61Trp). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with BLOC1S6-related conditions. ClinVar contains an entry for this variant (Variation ID: 574164). 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 disruptive. 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. -

Inborn genetic diseases

Uncertain:1

Jan 31, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.182T>G (p.L61W) alteration is located in exon 2 (coding exon 2) of the BLOC1S6 gene. This alteration results from a T to G substitution at nucleotide position 182, causing the leucine (L) at amino acid position 61 to be replaced by a tryptophan (W). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.64

BayesDel_addAF

Pathogenic

0.30

BayesDel_noAF

Pathogenic

0.19

CADD

Pathogenic

DANN

Benign

0.96

DEOGEN2

Uncertain

0.75

D;T;T

Eigen

Pathogenic

0.80

Eigen_PC

Pathogenic

0.79

FATHMM_MKL

Pathogenic

0.97

LIST_S2

Uncertain

0.91

D;D;D

M_CAP

Benign

0.027

MetaRNN

Uncertain

0.66

D;D;D

MetaSVM

Uncertain

-0.087

MutationAssessor

Uncertain

2.5

M;.;.

PrimateAI

Uncertain

0.58

PROVEAN

Uncertain

-4.2

D;D;D

REVEL

Uncertain

0.49

Sift

Uncertain

0.029

D;D;D

Sift4G

Uncertain

0.010

D;D;D

Polyphen

1.0

D;.;.

Vest4

0.73

MutPred

0.56

Loss of disorder (P = 0.0437);Loss of disorder (P = 0.0437);.;

MVP

0.40

MPC

1.6

ClinPred

1.0

GERP RS

6.1

Varity_R

0.28

gMVP

0.55

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over