chr17-75556068-A-G

Position:

• chr17-75556068-A-G

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_001031803.2(LLGL2):​c.98A>G​(p.His33Arg) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000686 in 1,456,976 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: LLGL2 NM_001031803.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 9.27

Genes affected

LLGL2 (HGNC:6629): (LLGL scribble cell polarity complex component 2) The lethal (2) giant larvae protein of Drosophila plays a role in asymmetric cell division, epithelial cell polarity, and cell migration. This human gene encodes a protein similar to lethal (2) giant larvae of Drosophila. In fly, the protein's ability to localize cell fate determinants is regulated by the atypical protein kinase C (aPKC). In human, this protein interacts with aPKC-containing complexes and is cortically localized in mitotic cells. Alternative splicing results in multiple transcript variants encoding different isoforms. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.86

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
LLGL2	NM_001031803.2	c.98A>G	p.His33Arg	missense_variant	3/26	ENST00000392550.8	NP_001026973.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
LLGL2	ENST00000392550.8	c.98A>G	p.His33Arg	missense_variant	3/26	1	NM_001031803.2	ENSP00000376333.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.86e-7 AC: 1 AN: 1456976 Hom.: 0 Cov.: 30 AF XY: 0.00 AC XY: 0 AN XY: 725108

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: 0.0000166

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

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

May 18, 2022

The c.98A>G (p.H33R) alteration is located in exon 3 (coding exon 2) of the LLGL2 gene. This alteration results from a A to G substitution at nucleotide position 98, causing the histidine (H) at amino acid position 33 to be replaced by an arginine (R). 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	Pathogenic	0.67
BayesDel_addAF	Pathogenic	0.49	D
BayesDel_noAF	Pathogenic	0.46
CADD	Pathogenic	26
DANN	Benign	0.95
DEOGEN2	Benign	0.14	T;.;.;T;.;T;.;T;T;T;.
Eigen	Pathogenic	0.71
Eigen_PC	Pathogenic	0.68
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Uncertain	0.93	D;D;.;D;D;D;D;D;D;D;D
M_CAP	Pathogenic	0.30	D
MetaRNN	Pathogenic	0.86	D;D;D;D;D;D;D;D;D;D;D
MetaSVM	Pathogenic	1.0	D
MutationAssessor	Uncertain	2.5	.;M;M;M;M;.;.;.;.;.;.
PrimateAI	Uncertain	0.59	T
PROVEAN	Uncertain	-3.5	.;D;D;D;.;.;.;.;.;.;.
REVEL	Pathogenic	0.95
Sift	Uncertain	0.0030	.;D;D;D;.;.;.;.;.;.;.
Sift4G	Uncertain	0.012	D;D;D;D;D;D;D;D;D;D;D
Polyphen		0.98, 0.96, 0.89	.;D;D;P;D;.;.;.;.;.;.
Vest4		0.84, 0.78, 0.83, 0.83
MutPred		0.49		Gain of phosphorylation at S36 (P = 0.0767);Gain of phosphorylation at S36 (P = 0.0767);Gain of phosphorylation at S36 (P = 0.0767);Gain of phosphorylation at S36 (P = 0.0767);Gain of phosphorylation at S36 (P = 0.0767);Gain of phosphorylation at S36 (P = 0.0767);Gain of phosphorylation at S36 (P = 0.0767);Gain of phosphorylation at S36 (P = 0.0767);Gain of phosphorylation at S36 (P = 0.0767);Gain of phosphorylation at S36 (P = 0.0767);.;
MVP		0.95
MPC		0.64
ClinPred		0.98	D
GERP RS		4.7
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.73
gMVP		0.80

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

LitVar

Other links and lift over

dbSNP: rs1247821190; hg19: chr17-73552149;