4-39459118-A-C

Position:

• chr4-39459118-A-C

Variant summary

Our verdict is Pathogenic. Variant got 10 ACMG points: 10P and 0B. PVS1 PM2

The NM_006859.4(LIAS):​c.1A>C​(p.Met1?) variant causes a start lost 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 (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: LIAS NM_006859.4 start_lost
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.93

Genes affected

LIAS (HGNC:16429): (lipoic acid synthetase) The protein encoded by this gene belongs to the biotin and lipoic acid synthetases family. Localized in the mitochondrion, this iron-sulfur enzyme catalyzes the final step in the de novo pathway for the biosynthesis of lipoic acid, a potent antioxidant. The deficient expression of this enzyme has been linked to conditions such as diabetes, atherosclerosis and neonatal-onset epilepsy. Alternative splicing occurs at this locus, and several transcript variants encoding distinct isoforms have been identified. [provided by RefSeq, Aug 2020]

ACMG classification

Verdict is Pathogenic. Variant got 10 ACMG points.

• PVS1: Start lost variant, no new inframe start found.
• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
LIAS	NM_006859.4	c.1A>C	p.Met1?	start_lost	1/11	ENST00000640888.2	NP_006850.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
LIAS	ENST00000640888.2	c.1A>C	p.Met1?	start_lost	1/11	1	NM_006859.4	ENSP00000492260	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Lipoic acid synthetase deficiency Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Nov 22, 2022

This sequence change affects the initiator methionine of the LIAS mRNA. The next in-frame methionine is located at codon 86. 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. Experimental studies and prediction algorithms are not available or were not evaluated, and the functional significance of this variant is currently unknown. ClinVar contains an entry for this variant (Variation ID: 1443884). This variant has not been reported in the literature in individuals affected with LIAS-related conditions. This variant is not present in population databases (gnomAD no frequency). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.31	D
BayesDel_noAF	Pathogenic	0.21
CADD	Benign	20
DANN	Benign	0.92
DEOGEN2	Benign	0.29	T;T;T;.;T;.;.;.;.
Eigen	Benign	-0.16
Eigen_PC	Benign	-0.023
FATHMM_MKL	Benign	0.60	D
LIST_S2	Uncertain	0.90	D;D;D;D;D;D;D;D;D
M_CAP	Pathogenic	0.48	D
MetaRNN	Pathogenic	0.97	D;D;D;D;D;D;D;D;D
MetaSVM	Benign	-0.77	T
MutationTaster	Benign	1.0	D;D;D;D
PROVEAN	Benign	-0.51	.;.;.;N;N;N;N;.;.
REVEL	Uncertain	0.42
Sift	Benign	0.14	.;.;.;T;D;T;T;.;.
Sift4G	Benign	0.45	.;.;.;T;T;T;T;.;.
Polyphen		0.0010	B;B;B;.;B;.;.;.;.
Vest4		0.81, 0.87, 0.82, 0.82
MutPred		0.98		Loss of MoRF binding (P = 0.0769);Loss of MoRF binding (P = 0.0769);Loss of MoRF binding (P = 0.0769);Loss of MoRF binding (P = 0.0769);Loss of MoRF binding (P = 0.0769);Loss of MoRF binding (P = 0.0769);Loss of MoRF binding (P = 0.0769);Loss of MoRF binding (P = 0.0769);Loss of MoRF binding (P = 0.0769);
MVP		0.79
ClinPred		0.96	D
GERP RS		4.0
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.6
Varity_R		0.47
gMVP		0.48

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: chr4-39460738;