rs1555404933

Variant names:

• chr15-40415403-T-C
• rs1555404933
• NM_002225.5:c.881T>C
• IVD p.Leu294Pro

Variant summary

Our verdict is Likely pathogenic. The variant received 6 ACMG points: 6P and 0B. PM1 PM2 PP3_Moderate

The NM_002225.5(IVD):​c.881T>C​(p.Leu294Pro) variant causes a missense, splice region change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 1/1 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. L294F) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 33)
• Consequence: IVD NM_002225.5 missense, splice_region
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.46
• Publications: 0 publications found

Genes affected

IVD (HGNC:6186): (isovaleryl-CoA dehydrogenase) Isovaleryl-CoA dehydrogenase (IVD) is a mitochondrial matrix enzyme that catalyzes the third step in leucine catabolism. The genetic deficiency of IVD results in an accumulation of isovaleric acid, which is toxic to the central nervous system and leads to isovaleric acidemia. Alternatively spliced transcript variants have been found for this gene. [provided by RefSeq, Aug 2017]

IVD Gene-Disease associations (from GenCC):

• isovaleric acidemia

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: G2P, Myriad Women's Health, Labcorp Genetics (formerly Invitae), ClinGen, Orphanet

ACMG classification

Our verdict: Likely_pathogenic. The variant received 6 ACMG points.

• PM1: In a hotspot region, there are 5 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 9 uncertain in NM_002225.5
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.929

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_002225.5. 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
	IVD	NM_002225.5	MANE Select	c.881T>C	p.Leu294Pro	missense splice_region	Exon 9 of 12	NP_002216.3	A0A0A0MT83
	IVD	NM_001354601.3		c.881T>C	p.Leu294Pro	missense splice_region	Exon 9 of 12	NP_001341530.2
	IVD	NM_001354600.3		c.968T>C	p.Leu323Pro	missense splice_region	Exon 9 of 13	NP_001341529.2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	IVD	ENST00000487418.8	TSL:1 MANE Select	c.881T>C	p.Leu294Pro	missense splice_region	Exon 9 of 12	ENSP00000418397.3	A0A0A0MT83
	IVD	ENST00000479013.7	TSL:1	c.791T>C	p.Leu264Pro	missense splice_region	Exon 8 of 11	ENSP00000417990.3	A0A0S2Z4K7
	IVD	ENST00000497816.1	TSL:1	n.258T>C		non_coding_transcript_exon	Exon 1 of 4

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	1	-	Isovaleryl-CoA dehydrogenase deficiency (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.98
BayesDel_addAF	Pathogenic	0.40	D
BayesDel_noAF	Pathogenic	0.34
CADD	Pathogenic	31
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.81	D
Eigen	Pathogenic	0.75
Eigen_PC	Uncertain	0.65
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Uncertain	0.94	D
M_CAP	Pathogenic	0.32	D
MetaRNN	Pathogenic	0.93	D
MetaSVM	Uncertain	0.29	D
PhyloP100		7.5
PrimateAI	Uncertain	0.62	T
PROVEAN	Pathogenic	-5.7	D
REVEL	Pathogenic	0.86
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Varity_R		0.95

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

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

Other links and lift over

dbSNP: rs1555404933;

hg19: chr15-40707602;