9-91361679-T-G

Variant names:

• chr9-91361679-T-G
• rs756127206
• NM_001698.3:c.211A>C

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_001351431.2(AUH):​c.-187A>C variant causes a 5 prime UTR premature start codon gain change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000211 in 1,425,066 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: AUH NM_001351431.2 5_prime_UTR_premature_start_codon_gain
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 0.983

Genes affected

AUH (HGNC:890): (AU RNA binding methylglutaconyl-CoA hydratase) This gene encodes bifunctional mitochondrial protein that has both RNA-binding and hydratase activities. The encoded protein is a methylglutaconyl-CoA hydratase that catalyzes the hydration of 3-methylglutaconyl-CoA to 3-hydroxy-3-methyl-glutaryl-CoA, a critical step in the leucine degradation pathway. This protein also binds AU-rich elements (AREs) found in the 3' UTRs of rapidly decaying mRNAs including c-fos, c-myc and granulocyte/ macrophage colony stimulating factor. ARE elements are involved in directing RNA to rapid degradation and deadenylation. This protein is localizes to the mitochondrial matrix and the inner mitochondrial membrane and may be involved in mitochondrial protein synthesis. Mutations in this gene are the cause of 3-methylglutaconic aciduria, type I. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Sep 2015]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.056165427).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
AUH	NM_001698.3	c.211A>C	p.Met71Leu	missense_variant	Exon 1 of 10	ENST00000375731.9	NP_001689.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
AUH	ENST00000375731.9	c.211A>C	p.Met71Leu	missense_variant	Exon 1 of 10	1	NM_001698.3	ENSP00000364883.5
AUH	ENST00000303617.5	c.211A>C	p.Met71Leu	missense_variant	Exon 1 of 9	1		ENSP00000307334.5
AUH	ENST00000478465.5	n.209A>C		non_coding_transcript_exon_variant	Exon 1 of 6	3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000542 AC: 1 AN: 184336 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 99466

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000131

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000211 AC: 3 AN: 1425066 Hom.: 0 Cov.: 32 AF XY: 0.00000142 AC XY: 1 AN XY: 705470

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000274

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

3-methylglutaconic aciduria type 1 Uncertain:2

Mar 08, 2021

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated, but these predictions have not been confirmed by published functional studies and their clinical significance is uncertain. This variant has not been reported in the literature in individuals with AUH-related conditions. ClinVar contains an entry for this variant (Variation ID: 547911). This variant is not present in population databases (ExAC no frequency). This sequence change replaces methionine with leucine at codon 71 of the AUH protein (p.Met71Leu). The methionine residue is weakly conserved and there is a small physicochemical difference between methionine and leucine. -

Feb 10, 2017

Mayo Clinic Laboratories, Mayo Clinic

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.084
BayesDel_addAF	Benign	-0.22	T
BayesDel_noAF	Benign	-0.56
CADD	Benign	8.3
DANN	Benign	0.34
DEOGEN2	Benign	0.11	T;.
Eigen	Benign	-1.4
Eigen_PC	Benign	-1.3
FATHMM_MKL	Benign	0.12	N
LIST_S2	Benign	0.22	T;T
M_CAP	Benign	0.024	T
MetaRNN	Benign	0.056	T;T
MetaSVM	Benign	-0.98	T
MutationAssessor	Benign	0.0	N;N
PrimateAI	Uncertain	0.73	T
PROVEAN	Benign	-0.080	N;N
REVEL	Benign	0.089
Sift	Benign	0.69	T;T
Sift4G	Benign	0.83	T;T
Polyphen		0.0	B;B
Vest4		0.18
MutPred		0.29		Gain of phosphorylation at T73 (P = 0.0767);Gain of phosphorylation at T73 (P = 0.0767);
MVP		0.27
MPC		0.25
ClinPred		0.025	T
GERP RS		1.9
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.15
gMVP		0.27

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: rs756127206; hg19: chr9-94123961;