NM_006859.4:c.363delA

Variant names:

• chr4-39463574-GA-G
• rs1553934199
• NM_006859.4:c.363delA

Variant summary

Our verdict is Pathogenic. The variant received 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_006859.4(LIAS):​c.363delA​(p.Glu122AsnfsTer11) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 32)
• Consequence: LIAS NM_006859.4 frameshift
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: -0.159
• Publications: 0 publications found

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]

LIAS Gene-Disease associations (from GenCC):

• lipoic acid synthetase deficiency

  Inheritance: AR Classification: STRONG, MODERATE, SUPPORTIVE Submitted by: Ambry Genetics, Orphanet, Genomics England PanelApp, Labcorp Genetics (formerly Invitae), G2P
• Leigh syndrome

  Inheritance: AR Classification: LIMITED Submitted by: ClinGen

ACMG classification

Our verdict: Pathogenic. The variant received 12 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 4-39463574-GA-G is Pathogenic according to our data. Variant chr4-39463574-GA-G is described in ClinVar as Pathogenic. ClinVar VariationId is 540089.Status of the report is criteria_provided_single_submitter, 1 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_006859.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	LIAS	NM_006859.4	MANE Select	c.363delA	p.Glu122AsnfsTer11	frameshift	Exon 4 of 11	NP_006850.2
	LIAS	NM_001278590.2		c.363delA	p.Glu122AsnfsTer11	frameshift	Exon 4 of 10	NP_001265519.1
	LIAS	NM_194451.3		c.363delA	p.Glu122AsnfsTer11	frameshift	Exon 4 of 10	NP_919433.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	LIAS	ENST00000640888.2	TSL:1 MANE Select	c.363delA	p.Glu122AsnfsTer11	frameshift	Exon 4 of 11	ENSP00000492260.1
	LIAS	ENST00000424936.6	TSL:1	c.363delA	p.Glu122AsnfsTer11	frameshift	Exon 4 of 4	ENSP00000491086.1
	LIAS	ENST00000946185.1		c.357delA	p.Glu120AsnfsTer11	frameshift	Exon 4 of 11	ENSP00000616244.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions as Germline

Significance: Pathogenic

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
1	-	-	Lipoic acid synthetase deficiency (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		-0.16
Mutation Taster		=1/199	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.31		Details are displayed if max score is > 0.2
DS_DL_spliceai		0.31		Position offset: 31

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs1553934199; hg19: chr4-39465194;