17-75840317-G-A

Position:

chr17-75840317-G-A

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1PM2PP5_Very_Strong

The NM_199242.3(UNC13D):c.766C>T(p.Arg256*) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000143 in 1,613,588 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★). Variant results in nonsense mediated mRNA decay.

Frequency

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

Exomes 𝑓: 0.000013 ( 0 hom. )

Consequence

UNC13D
NM_199242.3 stop_gained

Scores

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:7

Conservation

PhyloP100: 3.01

Variant links:

Genes affected

UNC13D (HGNC:23147): (unc-13 homolog D) This gene encodes a protein that is a member of the UNC13 family, containing similar domain structure as other family members but lacking an N-terminal phorbol ester-binding C1 domain present in other Munc13 proteins. The protein appears to play a role in vesicle maturation during exocytosis and is involved in regulation of cytolytic granules secretion. Mutations in this gene are associated with familial hemophagocytic lymphohistiocytosis type 3, a genetically heterogeneous, rare autosomal recessive disorder. [provided by RefSeq, Jul 2008]

UNC13D links:

UNC13D (HGNC:):

UNC13D links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 18 ACMG points.

PVS1

Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.

PM2

Very rare variant in population databases, with high coverage;

PP5

Variant 17-75840317-G-A is Pathogenic according to our data. Variant chr17-75840317-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 2000.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
UNC13D	NM_199242.3 linkuse as main transcript	c.766C>T	p.Arg256*	stop_gained	10/32	ENST00000207549.9	NP_954712.1	Q70J99-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
UNC13D	ENST00000207549.9 linkuse as main transcript	c.766C>T	p.Arg256*	stop_gained	10/32	1	NM_199242.3	ENSP00000207549.3		Q70J99-1

Frequencies

GnomAD3 genomes

AF:

0.0000263

AC:

AN:

152150

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000441

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000240

AC:

AN:

249946

Hom.:

AF XY:

0.0000369

AC XY:

AN XY:

135476

show subpopulations

Gnomad AFR exome

AF:

0.0000619

Gnomad AMR exome

AF:

0.0000290

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000355

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000130

AC:

AN:

1461438

Hom.:

Cov.:

AF XY:

0.0000165

AC XY:

AN XY:

727012

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000224

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000116

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000153

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000263

AC:

AN:

152150

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74332

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000441

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000959

Hom.:

Bravo

AF:

0.0000340

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000233

AC:

ExAC

AF:

0.0000330

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

EpiCase

AF:

0.00

EpiControl

AF:

0.000178

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:7

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Familial hemophagocytic lymphohistiocytosis 3

Pathogenic:4

Pathogenic, no assertion criteria provided	literature only	OMIM	Nov 14, 2003	- -
Pathogenic, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Aug 29, 2018	The UNC13D c.766C>T (p.Arg256Ter) variant is a stop-gained variant that is predicted to result in a premature termination of the protein. The c.766C>T (p.Arg256Ter) variant has been reported in five studies and is found in seven individuals with familial hemophagocytic lymphohistiocytosis in a compound heterozygous state (Feldmann et al. 2003; Zur Stadt et al. 2006; Nagai et al. 2010; Zhizhuo et al. 2012; Qian et al. 2014). The variant was absent from 276 control subjects and is present at a frequency of 0.000046 in the European (non-Finnish) population of the Exome Aggregation Consortium. Western blotting experiments showed that the p.Arg256Ter variant resulted in an absence of protein expression (Nagai et al. 2010). Due to the potential impact of stop-gained variants and the supporting evidence from the literature, the p.Arg256Ter variant is considered to be pathogenic for familial hemophagocytic lymphohistiocytosis. This variant was observed by ICSL as part of a predisposition screen in an ostensibly healthy population. -
Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Nov 06, 2023	This sequence change creates a premature translational stop signal (p.Arg256*) in the UNC13D gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in UNC13D are known to be pathogenic (PMID: 14622600). This variant is present in population databases (rs121434352, gnomAD 0.004%). This premature translational stop signal has been observed in individual(s) with hemophagocytic lymphohistiocytosis (PMID: 14622600, 21152410, 21674762, 24470399). It has also been observed to segregate with disease in related individuals. ClinVar contains an entry for this variant (Variation ID: 2000). For these reasons, this variant has been classified as Pathogenic. -
Likely pathogenic, criteria provided, single submitter	clinical testing	Center for Genomic Medicine, King Faisal Specialist Hospital and Research Center	Mar 26, 2024	- -

UNC13D-related disorder

Pathogenic:1

Pathogenic, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

Apr 05, 2024

The UNC13D c.766C>T variant is predicted to result in premature protein termination (p.Arg256*). This variant has been reported in the compound heterozygous state in siblings with familial hemophagocytic lymphohistiocytosis (FHL) (Feldman et al. 2003. PubMed ID: 14622600). Protein truncating variants located throughout the UNC13D gene have been reported in several patients with FHL and the p.Arg256* variant is consistent with being a primary cause of disease when present in the homozygous or compound heterozygous state (Meeths et al. 2011. PubMed ID: 21931115; Tesi et al. 2015. PubMed ID: 26684649; OMIM #608898). This variant is reported in 0.0040% of alleles in individuals of African descent in gnomAD and has been interpreted as pathogenic in ClinVar (https://www.ncbi.nlm.nih.gov/clinvar/variation/2000). We interpret this variant as pathogenic. -

not provided

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

GeneDx

Jan 18, 2019

The R256X nonsense variant has been reported previously in trans with another pathogenic variant in association with familial hemophagocytic lymphohistiocytosis (Feldmann et al., 2003). This variant is predicted to cause loss of normal protein function either through protein truncation or nonsense-mediated mRNA decay. The variant is not observed at a significant frequency in large population cohorts (Lek et al., 2016). We interpret this variant as pathogenic. -

Autoinflammatory syndrome

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Genome Diagnostics Laboratory, The Hospital for Sick Children

Dec 12, 2016

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Pathogenic

0.50

BayesDel_noAF

Pathogenic

0.55

CADD

Pathogenic

DANN

Uncertain

1.0

Eigen

Uncertain

0.67

Eigen_PC

Uncertain

0.48

FATHMM_MKL

Uncertain

0.83

Vest4

0.73

GERP RS

3.4

RBP_binding_hub_radar

0.92

RBP_regulation_power_radar

2.6

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

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