16-48361927-T-C

Variant summary

Our verdict is Likely pathogenic. Variant got 9 ACMG points: 9P and 0B. PS1_Moderate PM1 PM2 PP2 PP3 PP5

The NM_003031.4(SIAH1):c.502A>G(p.Thr168Ala) 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. Variant has been reported in ClinVar as Pathogenic (no stars). Another nucleotide change resulting in same amino acid change has been previously reported as Likely pathogenicin UniProt.

• Frequency: Genomes: not found (cov: 33)
• Consequence: SIAH1 NM_003031.4 missense
• Clinical Significance: Pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 8.02

Genes affected

SIAH1 (HGNC:10857): (siah E3 ubiquitin protein ligase 1) This gene encodes a protein that is a member of the seven in absentia homolog (SIAH) family. The protein is an E3 ligase and is involved in ubiquitination and proteasome-mediated degradation of specific proteins. The activity of this ubiquitin ligase has been implicated in the development of certain forms of Parkinson's disease, the regulation of the cellular response to hypoxia and induction of apoptosis. Alternative splicing results in several additional transcript variants, some encoding different isoforms and others that have not been fully characterized. [provided by RefSeq, Jul 2008]

LONP2 (HGNC:20598): (lon peptidase 2, peroxisomal) In human, peroxisomes function primarily to catalyze fatty acid beta-oxidation and, as a by-product, produce hydrogen peroxide and superoxide. The protein encoded by this gene is an ATP-dependent protease that likely plays a role in maintaining overall peroxisome homeostasis as well as proteolytically degrading peroxisomal proteins damaged by oxidation. The protein has an N-terminal Lon N substrate recognition domain, an ATPase domain, a proteolytic domain, and, in some isoforms, a C-terminal peroxisome targeting sequence. Alternative splicing results in multiple transcript variants encoding distinct isoforms. [provided by RefSeq, Jan 2017]

ACMG classification

Verdict is Likely_pathogenic. Variant got 9 ACMG points.

• PS1: Transcript NM_003031.4 (SIAH1) is affected with MISSENSE_VARIANT having same AA change as one Pathogenic present in UniProt
• PM1: In a chain E3 ubiquitin-protein ligase SIAH1 (size 281) in uniprot entity SIAH1_HUMAN there are 18 pathogenic changes around while only 0 benign (100%) in NM_003031.4
• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant where missense usually causes diseases, SIAH1
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.815
• PP5: Variant 16-48361927-T-C is Pathogenic according to our data. Variant chr16-48361927-T-C is described in ClinVar as [Pathogenic]. Clinvar id is 1082503.Status of the report is no_assertion_criteria_provided, 0 stars. Variant chr16-48361927-T-C is described in Lovd as [Likely_pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SIAH1	NM_003031.4	c.502A>G	p.Thr168Ala	missense_variant	2/2	ENST00000394725.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SIAH1	ENST00000394725.3	c.502A>G	p.Thr168Ala	missense_variant	2/2	1	NM_003031.4	P4

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 33

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: no assertion criteria provided

Submissions by phenotype

Buratti-Harel syndrome Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

May 13, 2021

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.98
BayesDel_addAF	Uncertain	0.16	D
BayesDel_noAF	Uncertain	-0.010
Cadd	Pathogenic	26
Dann	Uncertain	1.0
DEOGEN2	Uncertain	0.49	T;.;T
Eigen	Pathogenic	0.80
Eigen_PC	Pathogenic	0.76
FATHMM_MKL	Uncertain	0.92	D
M_CAP	Benign	0.047	D
MetaRNN	Pathogenic	0.81	D;D;D
MetaSVM	Benign	-0.61	T
MutationAssessor	Pathogenic	3.3	M;.;M
MutationTaster	Benign	1.0	D;D;D
PrimateAI	Pathogenic	0.87	D
REVEL	Uncertain	0.43
Sift4G	Uncertain	0.034	D;D;D
Polyphen		0.95	P;D;P
Vest4		0.70
MutPred		0.68		Loss of helix (P = 0.0376);.;Loss of helix (P = 0.0376);
MVP		0.79
MPC		2.6
ClinPred		0.99	D
GERP RS		5.2
Varity_R		0.89
gMVP		0.90

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr16-48395838;