chr1-89583378-G-A

Position:

• chr1-89583378-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 3P and 2B. PM2 PP2 BP4_Moderate

The NM_001369817.2(LRRC8B):​c.728G>A​(p.Arg243Lys) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: LRRC8B NM_001369817.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 5.59

Genes affected

LRRC8B (HGNC:30692): (leucine rich repeat containing 8 VRAC subunit B) Contributes to volume-sensitive anion channel activity. Involved in anion transmembrane transport. Located in cytoplasm and plasma membrane. Is integral component of plasma membrane. Part of ion channel complex. [provided by Alliance of Genome Resources, Apr 2022]

LRRC8C-DT (HGNC:53731): (LRRC8C divergent transcript)

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant where missense usually causes diseases, LRRC8B
• BP4: Computational evidence support a benign effect (MetaRNN=0.092630476).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
LRRC8B	NM_001369817.2	c.728G>A	p.Arg243Lys	missense_variant	5/6	ENST00000330947.7
LRRC8B	NM_001134476.2	c.728G>A	p.Arg243Lys	missense_variant	7/8
LRRC8B	NM_001369819.2	c.728G>A	p.Arg243Lys	missense_variant	6/7
LRRC8B	NM_015350.4	c.728G>A	p.Arg243Lys	missense_variant	8/9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
LRRC8B	ENST00000330947.7	c.728G>A	p.Arg243Lys	missense_variant	5/6	5	NM_001369817.2	P1
LRRC8C-DT	ENST00000655657.3	n.747C>T		non_coding_transcript_exon_variant	4/4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 34

GnomAD4 genome Cov.: 32

EpiCase AF: 0.0000545

EpiControl AF: 0.00

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

Sep 22, 2023

The c.728G>A (p.R243K) alteration is located in exon 5 (coding exon 1) of the LRRC8B gene. This alteration results from a G to A substitution at nucleotide position 728, causing the arginine (R) at amino acid position 243 to be replaced by a lysine (K). 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	0.13
BayesDel_addAF	Benign	-0.24	T
BayesDel_noAF	Benign	-0.58
CADD	Benign	17
DANN	Benign	0.69
DEOGEN2	Benign	0.029	T;T;T;T
Eigen	Benign	-0.44
Eigen_PC	Benign	-0.19
FATHMM_MKL	Uncertain	0.89	D
M_CAP	Benign	0.0041	T
MetaRNN	Benign	0.093	T;T;T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	-0.83	N;N;N;N
MutationTaster	Benign	0.63	D;D;D
PrimateAI	Uncertain	0.63	T
Polyphen		0.0	B;B;B;B
Vest4		0.071, 0.16
MutPred		0.40		Gain of methylation at R243 (P = 0.0056);Gain of methylation at R243 (P = 0.0056);Gain of methylation at R243 (P = 0.0056);Gain of methylation at R243 (P = 0.0056);
MVP		0.043
MPC		0.52
ClinPred		0.25	T
GERP RS		5.3
Varity_R		0.088
gMVP		0.42

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: chr1-90048937;