3-3844798-G-A

Position:

• chr3-3844798-G-A

Variant summary

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

The NM_020873.7(LRRN1):​c.157G>A​(p.Ala53Thr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: LRRN1 NM_020873.7 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 9.92

Genes affected

LRRN1 (HGNC:20980): (leucine rich repeat neuronal 1) Predicted to act upstream of or within positive regulation of synapse assembly. Predicted to be integral component of membrane. Predicted to be active in extracellular matrix and extracellular space. [provided by Alliance of Genome Resources, Apr 2022]

SUMF1 (HGNC:20376): (sulfatase modifying factor 1) This gene encodes an enzyme that catalyzes the hydrolysis of sulfate esters by oxidizing a cysteine residue in the substrate sulfatase to an active site 3-oxoalanine residue, which is also known as C-alpha-formylglycine. Mutations in this gene cause multiple sulfatase deficiency, a lysosomal storage disorder. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Sep 2009]

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, 0.899

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
LRRN1	NM_020873.7	c.157G>A	p.Ala53Thr	missense_variant	2/2	ENST00000319331.4
LRRN1	NM_001324188.2	c.157G>A	p.Ala53Thr	missense_variant	3/3
LRRN1	NM_001324189.2	c.157G>A	p.Ala53Thr	missense_variant	3/3
LRRN1	XM_047448644.1	c.157G>A	p.Ala53Thr	missense_variant	2/2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
LRRN1	ENST00000319331.4	c.157G>A	p.Ala53Thr	missense_variant	2/2	1	NM_020873.7	P1
SUMF1	ENST00000448413.5	c.1192-17289C>T		intron_variant, NMD_transcript_variant		2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 29

GnomAD4 genome Cov.: 33

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

Mar 25, 2024

The c.157G>A (p.A53T) alteration is located in exon 2 (coding exon 1) of the LRRN1 gene. This alteration results from a G to A substitution at nucleotide position 157, causing the alanine (A) at amino acid position 53 to be replaced by a threonine (T). 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	0.74
BayesDel_addAF	Benign	0.011	T
BayesDel_noAF	Benign	-0.22
CADD	Pathogenic	28
DANN	Pathogenic	1.0
DEOGEN2	Benign	0.063	T
Eigen	Pathogenic	0.92
Eigen_PC	Pathogenic	0.91
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.96	D
M_CAP	Benign	0.018	T
MetaRNN	Pathogenic	0.90	D
MetaSVM	Benign	-0.90	T
MutationAssessor	Uncertain	2.6	M
MutationTaster	Benign	1.0	D;D
PrimateAI	Pathogenic	0.83	D
PROVEAN	Uncertain	-2.5	N
REVEL	Uncertain	0.40
Sift	Uncertain	0.0010	D
Sift4G	Uncertain	0.0030	D
Polyphen		1.0	D
Vest4		0.65
MutPred		0.86		Gain of disorder (P = 0.0331);
MVP		0.26
MPC		0.52
ClinPred		0.93	D
GERP RS		5.8
Varity_R		0.42
gMVP		0.63

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: rs1465244412; hg19: chr3-3886482;