20-25306909-G-T

Variant names:

• chr20-25306909-G-T
• rs776800006
• NM_001042472.3:c.874C>A

Variant summary

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

The NM_001042472.3(ABHD12):​c.874C>A​(p.Arg292Arg) 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.

• Frequency: Genomes: not found (cov: 33)
• Consequence: ABHD12 NM_001042472.3 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.90
• Publications: 4 publications found

Genes affected

ABHD12 (HGNC:15868): (abhydrolase domain containing 12, lysophospholipase) This gene encodes an enzyme that catalyzes the hydrolysis of 2-arachidonoyl glycerol (2-AG), the main endocannabinoid lipid transmitter that acts on cannabinoid receptors, CB1 and CB2. The endocannabinoid system is involved in a wide range of physiological processes, including neurotransmission, mood, appetite, pain appreciation, addiction behavior, and inflammation. Mutations in this gene are associated with the neurodegenerative disease, PHARC (polyneuropathy, hearing loss, ataxia, retinitis pigmentosa, and cataract), resulting from an inborn error of endocannabinoid metabolism. Alternatively spliced transcript variants encoding different isoforms have been noted for this gene.[provided by RefSeq, Jan 2011]

ABHD12 Gene-Disease associations (from GenCC):

• PHARC syndrome

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, ClinGen, G2P, Labcorp Genetics (formerly Invitae)

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_001042472.3. 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
	ABHD12	NM_001042472.3	MANE Select	c.874C>A	p.Arg292Arg	synonymous	Exon 10 of 13	NP_001035937.1	Q8N2K0-1
	ABHD12	NM_015600.5		c.874C>A	p.Arg292Arg	synonymous	Exon 10 of 13	NP_056415.1	Q8N2K0-2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ABHD12	ENST00000339157.10	TSL:2 MANE Select	c.874C>A	p.Arg292Arg	synonymous	Exon 10 of 13	ENSP00000341408.5	Q8N2K0-1
	ABHD12	ENST00000376542.8	TSL:1	c.874C>A	p.Arg292Arg	synonymous	Exon 10 of 13	ENSP00000365725.3	Q8N2K0-2
	ABHD12	ENST00000969645.1		c.874C>A	p.Arg292Arg	synonymous	Exon 10 of 13	ENSP00000639704.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 29

GnomAD4 genome Cov.: 33

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000378

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.34
CADD	Benign	7.0
DANN	Benign	0.69
PhyloP100		1.9

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.25		Details are displayed if max score is > 0.2
DS_AL_spliceai		0.25		Position offset: 6

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

Other links and lift over

dbSNP: rs776800006; hg19: chr20-25287545;