4-39470130-C-G

Variant names:

• chr4-39470130-C-G
• NM_006859.4:c.849C>G
• LIAS p.Gly283Gly

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 2P and 5B. PM2 BP4_Strong BP7

The NM_006859.4(LIAS):​c.849C>G​(p.Gly283Gly) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. G283G) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: LIAS NM_006859.4 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -2.36
• 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, Genomics England PanelApp, G2P, Orphanet, Labcorp Genetics (formerly Invitae)
• Leigh syndrome

  Inheritance: AR Classification: LIMITED Submitted by: ClinGen

ENSG00000298383 (HGNC:):

ACMG classification

Our verdict: Likely_benign. The variant received -3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.56).
• BP7: Synonymous conserved (PhyloP=-2.36 with no splicing effect.

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.849C>G	p.Gly283Gly	synonymous	Exon 8 of 11	NP_006850.2
	LIAS	NM_001278590.2		c.720C>G	p.Gly240Gly	synonymous	Exon 7 of 10	NP_001265519.1	O43766-3
	LIAS	NM_194451.3		c.849C>G	p.Gly283Gly	synonymous	Exon 8 of 10	NP_919433.1	O43766-2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	LIAS	ENST00000640888.2	TSL:1 MANE Select	c.849C>G	p.Gly283Gly	synonymous	Exon 8 of 11	ENSP00000492260.1	O43766-1
	LIAS	ENST00000640816.1	TSL:1	n.1257C>G		non_coding_transcript_exon	Exon 1 of 4
	LIAS	ENST00000946185.1		c.843C>G	p.Gly281Gly	synonymous	Exon 8 of 11	ENSP00000616244.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.56
CADD	Benign	3.0
DANN	Benign	0.57
PhyloP100		-2.4

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.13		Details are displayed if max score is > 0.2

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

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Other links and lift over

hg19: chr4-39471750;