chr20-64083922-G-T

Position:

• chr20-64083922-G-T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_001353425.2(LKAAEAR1):​c.298C>A​(p.Leu100Ile) variant causes a missense 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. 14/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: LKAAEAR1 NM_001353425.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.0300

Genes affected

LKAAEAR1 (HGNC:33718): (LKAAEAR motif containing 1)

OPRL1 (HGNC:8155): (opioid related nociceptin receptor 1) The protein encoded by this gene is a member of the 7 transmembrane-spanning G protein-coupled receptor family, and functions as a receptor for the endogenous, opioid-related neuropeptide, nociceptin/orphanin FQ. This receptor-ligand system modulates a variety of biological functions and neurobehavior, including stress responses and anxiety behavior, learning and memory, locomotor activity, and inflammatory and immune responses. A promoter region between this gene and the 5'-adjacent RGS19 (regulator of G-protein signaling 19) gene on the opposite strand functions bi-directionally as a core-promoter for both genes, suggesting co-operative transcriptional regulation of these two functionally related genes. Alternatively spliced transcript variants have been described for this gene. A recent study provided evidence for translational readthrough in this gene, and expression of an additional C-terminally extended isoform via the use of an alternative in-frame translation termination codon. [provided by RefSeq, Dec 2017]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.08669597).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
LKAAEAR1	NM_001353425.2	c.298C>A	p.Leu100Ile	missense_variant	1/3	ENST00000302096.5
OPRL1	NM_182647.4	c.-185+3570G>T		intron_variant		ENST00000336866.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
LKAAEAR1	ENST00000302096.5	c.298C>A	p.Leu100Ile	missense_variant	1/3	2	NM_001353425.2	P1
OPRL1	ENST00000336866.7	c.-185+3570G>T		intron_variant		5	NM_182647.4	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1300594 Hom.: 0 Cov.: 35 AF XY: 0.00 AC XY: 0 AN XY: 638100

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: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Nov 23, 2021

The c.298C>A (p.L100I) alteration is located in exon 1 (coding exon 1) of the LKAAEAR1 gene. This alteration results from a C to A substitution at nucleotide position 298, causing the leucine (L) at amino acid position 100 to be replaced by an isoleucine (I). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.11
BayesDel_addAF	Benign	-0.26	T
BayesDel_noAF	Benign	-0.61
CADD	Benign	7.1
DANN	Benign	0.88
DEOGEN2	Benign	0.030	.;T
Eigen	Benign	-0.79
Eigen_PC	Benign	-0.94
FATHMM_MKL	Benign	0.15	N
LIST_S2	Benign	0.41	T;T
M_CAP	Uncertain	0.13	D
MetaRNN	Benign	0.087	T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	1.8	L;L
MutationTaster	Benign	1.0	N;N;N;N
PROVEAN	Benign	-0.73	N;N
REVEL	Benign	0.024
Sift	Benign	0.13	T;T
Sift4G	Benign	0.29	T;T
Polyphen		0.57	P;.
Vest4		0.14
MutPred		0.14		Loss of disorder (P = 0.0825);Loss of disorder (P = 0.0825);
MVP		0.072
MPC		0.98
ClinPred		0.11	T
GERP RS		0.57
Varity_R		0.068
gMVP		0.017

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr20-62715275;