NM_006398.4:c.198T>A

Variant names:

• chr6-29556180-A-T
• rs404240
• NM_006398.4:c.198T>A

Variant summary

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

The NM_006398.4(UBD):​c.198T>A​(p.Tyr66*) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: not found (cov: 32)
• Consequence: UBD NM_006398.4 stop_gained
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -1.00
• Publications: 0 publications found

Genes affected

UBD (HGNC:18795): (ubiquitin D) This gene encodes a protein which contains two ubiquitin-like domains and appears to have similar function to ubiquitin. Through covalent attachment, the encoded protein targets other proteins for 26S proteasome degradation. This protein has been implicated to function in many cellular processes, including caspase-dependent apoptosis, formation of aggresomes, mitotic regulation, and dendritic cell maturation. Upregulation of this gene may promote inflammation in chronic kidney disease and has been observed in many cancer types. [provided by RefSeq, Aug 2017]

OR2I1 (HGNC:8258): (olfactory receptor family 2 subfamily I member 1 pseudogene) Olfactory receptors interact with odorant molecules in the nose, to initiate a neuronal response that triggers the perception of a smell. The olfactory receptor proteins are members of a large family of G-protein-coupled receptors (GPCR) arising from single coding-exon genes. Olfactory receptors share a 7-transmembrane domain structure with many neurotransmitter and hormone receptors and are responsible for the recognition and G protein-mediated transduction of odorant signals. The olfactory receptor gene family is the largest in the genome. The nomenclature assigned to the olfactory receptor genes and proteins for this organism is independent of other organisms. [provided by RefSeq, Jul 2008]

GABBR1 (HGNC:4070): (gamma-aminobutyric acid type B receptor subunit 1) This gene encodes a receptor for gamma-aminobutyric acid (GABA), which is the main inhibitory neurotransmitter in the mammalian central nervous system. This receptor functions as a heterodimer with GABA(B) receptor 2. Defects in this gene may underlie brain disorders such as schizophrenia and epilepsy. Alternative splicing generates multiple transcript variants, but the full-length nature of some of these variants has not been determined. [provided by RefSeq, Jan 2016]

GABBR1 Gene-Disease associations (from GenCC):

• neurodevelopmental disorder with language delay and variable cognitive abnormalities

  Inheritance: AD Classification: MODERATE Submitted by: G2P

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_006398.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	UBD	NM_006398.4	MANE Select	c.198T>A	p.Tyr66*	stop_gained	Exon 2 of 2	NP_006389.2
	OR2I1	NM_001396058.1	MANE Select	c.*2014A>T		3_prime_UTR	Exon 2 of 2	NP_001382987.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	UBD	ENST00000377050.5	TSL:1 MANE Select	c.198T>A	p.Tyr66*	stop_gained	Exon 2 of 2	ENSP00000366249.4
	OR2I1P	ENST00000641137.2	MANE Select	c.*2014A>T		3_prime_UTR	Exon 2 of 2	ENSP00000493715.1
	OR2I1P	ENST00000641730.1		n.3824A>T		non_coding_transcript_exon	Exon 2 of 2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 37

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.38	D
BayesDel_noAF	Pathogenic	0.31
CADD	Pathogenic	29
DANN	Uncertain	0.99
Eigen	Benign	-0.079
Eigen_PC	Benign	-0.41
FATHMM_MKL	Benign	0.021	N
PhyloP100		-1.0
Vest4		0.73
GERP RS		-3.2
Mutation Taster		=69/131	disease causing

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

Other links and lift over

dbSNP: rs404240; hg19: chr6-29523957;