2-26279189-C-A

Variant names:

• chr2-26279189-C-A
• rs759136382
• NM_000183.3:c.685C>A
• HADHB p.Arg229Arg

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_000183.3(HADHB):​c.685C>A​(p.Arg229Arg) variant causes a synonymous change. The variant was absent in control chromosomes in GnomAD project. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: not found (cov: 32)
• Consequence: HADHB NM_000183.3 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 3.61
• Publications: 3 publications found

Genes affected

HADHB (HGNC:4803): (hydroxyacyl-CoA dehydrogenase trifunctional multienzyme complex subunit beta) This gene encodes the beta subunit of the mitochondrial trifunctional protein, which catalyzes the last three steps of mitochondrial beta-oxidation of long chain fatty acids. The mitochondrial membrane-bound heterocomplex is composed of four alpha and four beta subunits, with the beta subunit catalyzing the 3-ketoacyl-CoA thiolase activity. The encoded protein can also bind RNA and decreases the stability of some mRNAs. The genes of the alpha and beta subunits of the mitochondrial trifunctional protein are located adjacent to each other in the human genome in a head-to-head orientation. Mutations in this gene result in trifunctional protein deficiency. Alternatively spliced transcript variants encoding different isoforms have been described. [provided by RefSeq, Jul 2013]

HADHB Gene-Disease associations (from GenCC):

• mitochondrial trifunctional protein deficiency

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), ClinGen, Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000183.3. 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
	HADHB	NM_000183.3	MANE Select	c.685C>A	p.Arg229Arg	synonymous	Exon 9 of 16	NP_000174.1	P55084-1
	HADHB	NM_001281512.2		c.640C>A	p.Arg214Arg	synonymous	Exon 8 of 15	NP_001268441.1	F5GZQ3
	HADHB	NM_001281513.2		c.619C>A	p.Arg207Arg	synonymous	Exon 10 of 17	NP_001268442.1	P55084-2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	HADHB	ENST00000317799.10	TSL:1 MANE Select	c.685C>A	p.Arg229Arg	synonymous	Exon 9 of 16	ENSP00000325136.5	P55084-1
	HADHB	ENST00000942431.1		c.769C>A	p.Arg257Arg	synonymous	Exon 10 of 17	ENSP00000612490.1
	HADHB	ENST00000942426.1		c.715C>A	p.Arg239Arg	synonymous	Exon 9 of 16	ENSP00000612485.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

Alfa AF: 0.0000218 Hom.: 0

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Uncertain	-0.030
CADD	Benign	12
DANN	Benign	0.72
PhyloP100		3.6
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Mutation Taster		=91/9	polymorphism

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: rs759136382;

hg19: chr2-26502057;