chr22-26470774-G-T

Variant names:

• chr22-26470774-G-T
• rs119471022
• NM_022081.6:c.541C>A

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_022081.6(HPS4):​c.541C>A​(p.Gln181Lys) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: not found (cov: 33)
• Consequence: HPS4 NM_022081.6 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 7.71
• Publications: 5 publications found

Genes affected

HPS4 (HGNC:15844): (HPS4 biogenesis of lysosomal organelles complex 3 subunit 2) This gene encodes a protein component of biogenesis of lysosome-related organelles complexes (BLOC). BLOC complexes are important for the formation of endosomal-lysosomal organelles such as melanosomes and platelet dense granules. Mutations in this gene result in subtype 4 of Hermansky-Pudlak syndrome, a form of albinism. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Aug 2012]

HPS4 Gene-Disease associations (from GenCC):

• Hermansky-Pudlak syndrome 4

  Inheritance: AR Classification: DEFINITIVE, STRONG, MODERATE Submitted by: G2P, ClinGen, Labcorp Genetics (formerly Invitae), Ambry Genetics
• Hermansky-Pudlak syndrome with pulmonary fibrosis

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.899

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
HPS4	NM_022081.6	c.541C>A	p.Gln181Lys	missense_variant	Exon 7 of 14	ENST00000398145.7	NP_071364.4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
HPS4	ENST00000398145.7	c.541C>A	p.Gln181Lys	missense_variant	Exon 7 of 14	1	NM_022081.6	ENSP00000381213.2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000378

ESP6500AA AF: 0.00 AC: 0

ESP6500EA AF: 0.000116 AC: 1

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.45
BayesDel_addAF	Pathogenic	0.44	D
BayesDel_noAF	Pathogenic	0.40
CADD	Pathogenic	27
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.68	D;.;D;.
Eigen	Pathogenic	0.71
Eigen_PC	Uncertain	0.64
FATHMM_MKL	Uncertain	0.94	D
LIST_S2	Uncertain	0.93	.;D;D;D
M_CAP	Pathogenic	0.30	D
MetaRNN	Pathogenic	0.90	D;D;D;D
MetaSVM	Uncertain	0.71	D
MutationAssessor	Uncertain	2.8	M;.;M;.
PhyloP100		7.7
PrimateAI	Uncertain	0.60	T
PROVEAN	Uncertain	-3.6	D;D;D;D
REVEL	Pathogenic	0.89
Sift	Uncertain	0.018	D;D;D;D
Sift4G	Pathogenic	0.0	D;D;D;.
Polyphen		1.0	D;D;D;.
Vest4		0.83
MVP		0.93
MPC		0.34
ClinPred		0.99	D
GERP RS		3.8
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.56
gMVP		0.74
Mutation Taster		=65/35	polymorphism

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: rs119471022; hg19: chr22-26866740;