17-18233891-C-G

Variant names:

• chr17-18233891-C-G
• NM_004140.4:c.506C>G
• LLGL1 p.Thr169Ser

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_004140.4(LLGL1):​c.506C>G​(p.Thr169Ser) 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. 16/22 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. T169A) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 33)
• Consequence: LLGL1 NM_004140.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -1.64
• Publications: 0 publications found

Genes affected

LLGL1 (HGNC:6628): (LLGL scribble cell polarity complex component 1) This gene encodes a protein that is similar to a tumor suppressor in Drosophila. The protein is part of a cytoskeletal network and is associated with nonmuscle myosin II heavy chain and a kinase that specifically phosphorylates this protein at serine residues. The gene is located within the Smith-Magenis syndrome region on chromosome 17. [provided by RefSeq, Jul 2008]

LLGL1 Gene-Disease associations (from GenCC):

• Tourette syndrome

  Inheritance: Unknown Classification: NO_KNOWN Submitted by: Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.043823153).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_004140.4. 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
	LLGL1	NM_004140.4	MANE Select	c.506C>G	p.Thr169Ser	missense	Exon 5 of 23	NP_004131.4

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	LLGL1	ENST00000316843.9	TSL:1 MANE Select	c.506C>G	p.Thr169Ser	missense	Exon 5 of 23	ENSP00000321537.4	Q15334
	LLGL1	ENST00000855607.1		c.506C>G	p.Thr169Ser	missense	Exon 5 of 23	ENSP00000525666.1
	LLGL1	ENST00000855606.1		c.506C>G	p.Thr169Ser	missense	Exon 5 of 23	ENSP00000525665.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.083
BayesDel_addAF	Benign	-0.42	T
BayesDel_noAF	Benign	-0.83
CADD	Benign	1.4
DANN	Benign	0.69
DEOGEN2	Benign	0.26	T
Eigen	Benign	-1.2
Eigen_PC	Benign	-1.1
FATHMM_MKL	Benign	0.082	N
M_CAP	Benign	0.0073	T
MetaRNN	Benign	0.044	T
MetaSVM	Benign	-0.91	T
MutationAssessor	Benign	0.23	N
PhyloP100		-1.6
PrimateAI	Benign	0.30	T
PROVEAN	Benign	-0.35	N
REVEL	Benign	0.014
Sift	Benign	0.69	T
Sift4G	Benign	0.70	T
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.2
Varity_R		0.019
gMVP		0.22

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

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Other links and lift over

hg19: chr17-18137205;