chr3-149162731-G-T

Variant names:

• chr3-149162731-G-T
• NM_032383.5:c.2334G>T

Variant summary

Our verdict is Uncertain significance. The variant received 3 ACMG points: 3P and 0B. PM2 PP3

The NM_032383.5(HPS3):​c.2334G>T​(p.Leu778Phe) 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 pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. L778S) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: HPS3 NM_032383.5 missense
• Clinical Significance: Uncertain significance no assertion criteria provided U:1
• Conservation: PhyloP100: 2.72
• Publications: 0 publications found

Genes affected

HPS3 (HGNC:15597): (HPS3 biogenesis of lysosomal organelles complex 2 subunit 1) This gene encodes a protein containing a potential clathrin-binding motif, consensus dileucine signals, and tyrosine-based sorting signals for targeting to vesicles of lysosomal lineage. The encoded protein may play a role in organelle biogenesis associated with melanosomes, platelet dense granules, and lysosomes. Mutations in this gene are associated with Hermansky-Pudlak syndrome type 3. [provided by RefSeq, Apr 2015]

CP (HGNC:2295): (ceruloplasmin) The protein encoded by this gene is a metalloprotein that binds most of the copper in plasma and is involved in the peroxidation of Fe(II)transferrin to Fe(III) transferrin. Mutations in this gene cause aceruloplasminemia, which results in iron accumulation and tissue damage, and is associated with diabetes and neurologic abnormalities. Two transcript variants, one protein-coding and the other not protein-coding, have been found for this gene. [provided by RefSeq, Feb 2012]

CP Gene-Disease associations (from GenCC):

• aceruloplasminemia

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Genomics England PanelApp, Orphanet, Labcorp Genetics (formerly Invitae), Ambry Genetics
• disorder of iron metabolism and transport

  Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics

ACMG classification

Our verdict: Uncertain_significance. The variant received 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.788

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
HPS3	NM_032383.5	c.2334G>T	p.Leu778Phe	missense_variant	Exon 13 of 17	ENST00000296051.7	NP_115759.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
HPS3	ENST00000296051.7	c.2334G>T	p.Leu778Phe	missense_variant	Exon 13 of 17	1	NM_032383.5	ENSP00000296051.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: no assertion criteria provided

Submissions by phenotype

Hermansky-Pudlak syndrome Uncertain:1

Apr 17, 2025

Natera, Inc.

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: clinical testing

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Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.33
BayesDel_addAF	Pathogenic	0.21	D
BayesDel_noAF	Uncertain	0.060
CADD	Uncertain	24
DANN	Uncertain	1.0
DEOGEN2	Benign	0.28	T;T
Eigen	Uncertain	0.38
Eigen_PC	Uncertain	0.38
FATHMM_MKL	Uncertain	0.91	D
LIST_S2	Uncertain	0.89	D;D
M_CAP	Benign	0.052	D
MetaRNN	Pathogenic	0.79	D;D
MetaSVM	Benign	-0.45	T
MutationAssessor	Uncertain	2.1	M;.
PhyloP100		2.7
PrimateAI	Uncertain	0.53	T
PROVEAN	Benign	-2.1	N;N
REVEL	Uncertain	0.54
Sift	Uncertain	0.011	D;D
Sift4G	Pathogenic	0.0	D;D
Polyphen		1.0	D;D
Vest4		0.73
MutPred		0.54		Loss of helix (P = 0.2022);.;
MVP		0.76
MPC		0.61
ClinPred		0.91	D
GERP RS		4.0
Varity_R		0.13
gMVP		0.54
Mutation Taster		=77/23	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.080		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

hg19: chr3-148880518;