4-39459117-A-G

Variant names:

• chr4-39459117-A-G
• rs139360916
• NM_006859.4:c.-1A>G

Variant summary

Our verdict is Benign. Variant got -7 ACMG points: 2P and 9B. PM2 BP4_Strong BP6 BS1

The NM_006859.4(LIAS):​c.-1A>G variant causes a 5 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000812 in 1,614,132 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: 𝑓 0.00012 (0 hom., cov: 33)
  • Exomes 𝑓: 0.000077 (1 hom.)
• Consequence: LIAS NM_006859.4 5_prime_UTR
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1 B:2
• Conservation: PhyloP100: -0.130

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 Benign. Variant got -7 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.56).
• BP6: Variant 4-39459117-A-G is Benign according to our data. Variant chr4-39459117-A-G is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 597605.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=1, Uncertain_significance=1}.
• BS1: Variant frequency is greater than expected in population mid. gnomad4_exome allele frequency = 0.0000773 (113/1461824) while in subpopulation MID AF= 0.0026 (15/5768). AF 95% confidence interval is 0.0016. There are 1 homozygotes in gnomad4_exome. There are 57 alleles in male gnomad4_exome subpopulation. Median coverage is 31. This position pass quality control queck.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
LIAS	NM_006859.4	c.-1A>G		5_prime_UTR_variant	Exon 1 of 11	ENST00000640888.2	NP_006850.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
LIAS	ENST00000640888	c.-1A>G		5_prime_UTR_variant	Exon 1 of 11	1	NM_006859.4	ENSP00000492260.1

Frequencies

GnomAD3 genomes AF: 0.000118 AC: 18 AN: 152190 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000523

Gnomad ASJ AF: 0.000865

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000882

Gnomad OTH AF: 0.000478

GnomAD3 exomes AF: 0.000151 AC: 38 AN: 251338 Hom.: 1 AF XY: 0.000162 AC XY: 22 AN XY: 135852

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.000434

Gnomad ASJ exome AF: 0.000199

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000167

Gnomad OTH exome AF: 0.000326

GnomAD4 exome AF: 0.0000773 AC: 113 AN: 1461824 Hom.: 1 Cov.: 31 AF XY: 0.0000784 AC XY: 57 AN XY: 727212

Gnomad4 AFR exome AF: 0.0000299

Gnomad4 AMR exome AF: 0.000470

Gnomad4 ASJ exome AF: 0.0000765

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000558

Gnomad4 OTH exome AF: 0.000199

GnomAD4 genome AF: 0.000118 AC: 18 AN: 152308 Hom.: 0 Cov.: 33 AF XY: 0.000134 AC XY: 10 AN XY: 74474

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.000523

Gnomad4 ASJ AF: 0.000865

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000882

Gnomad4 OTH AF: 0.000473

Alfa AF: 0.000184 Hom.: 1

Bravo AF: 0.000128

EpiCase AF: 0.000164

EpiControl AF: 0.000415

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1 Benign:2

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not provided Uncertain:1 Benign:1

Apr 03, 2018

GeneDx

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -

Jun 27, 2018

Eurofins Ntd Llc (ga)

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

LIAS-related disorder Benign:1

Dec 16, 2019

PreventionGenetics, part of Exact Sciences

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.56
CADD	Benign	14
DANN	Benign	0.86
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.6

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

Other links and lift over

dbSNP: rs139360916; hg19: chr4-39460737;