Genetic Variant LEFTY2:p.Ala116Ala (chr1-225939905-G-C) – ACMG Classification: Benign (-11 pts)

Variant summary

Our verdict is Benign. Variant got -11 ACMG points: 0P and 11B. BP4_StrongBP6_ModerateBP7BS2

The NM_003240.5(LEFTY2):c.348C>G(p.Ala116Ala) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000637 in 1,413,808 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★). Synonymous variant affecting the same amino acid position (i.e. A116A) has been classified as Likely benign.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 0.0000064 ( 0 hom. )

Consequence

LEFTY2
NM_003240.5 synonymous

Scores

Clinical Significance

Likely benign criteria provided, single submitter B:1

Conservation

PhyloP100: -2.69

Variant links:

Genes affected

LEFTY2 (HGNC:3122): (left-right determination factor 2) This gene encodes a secreted ligand of the TGF-beta (transforming growth factor-beta) superfamily of proteins. Ligands of this family bind various TGF-beta receptors leading to recruitment and activation of SMAD family transcription factors that regulate gene expression. The encoded preproprotein is proteolytically processed to generate the mature protein, which plays a role in left-right asymmetry determination of organ systems during development. The protein may also play a role in endometrial bleeding. Mutations in this gene have been associated with left-right axis malformations, particularly in the heart and lungs. Some types of infertility have been associated with dysregulated expression of this gene in the endometrium. This gene is closely linked to both a related family member and a related pseudogene. This gene encodes multiple isoforms that may undergo similar proteolytic processing. [provided by RefSeq, Aug 2016]

LEFTY2 links:

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ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -11 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.69).

BP6

Variant 1-225939905-G-C is Benign according to our data. Variant chr1-225939905-G-C is described in ClinVar as [Likely_benign]. Clinvar id is 2882097.Status of the report is criteria_provided_single_submitter, 1 stars.

BP7

Synonymous conserved (PhyloP=-2.69 with no splicing effect.

BS2

High AC in GnomAdExome4 at 9 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
LEFTY2	NM_003240.5 link	c.348C>G	p.Ala116Ala	synonymous_variant	Exon 2 of 4	ENST00000366820.10	NP_003231.2	O00292-1A1NY82
LEFTY2	XM_011544266.2 link	c.348C>G	p.Ala116Ala	synonymous_variant	Exon 2 of 4		XP_011542568.1
LEFTY2	NM_001172425.3 link	c.280-34C>G		intron_variant	Intron 2 of 4		NP_001165896.1	O00292-2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
LEFTY2	ENST00000366820.10 link	c.348C>G	p.Ala116Ala	synonymous_variant	Exon 2 of 4	1	NM_003240.5	ENSP00000355785.5	O00292-1
LEFTY2	ENST00000420304.6 link	c.280-34C>G		intron_variant	Intron 2 of 4	2		ENSP00000388009.2	O00292-2
LEFTY2	ENST00000474493.1 link	n.197C>G		non_coding_transcript_exon_variant	Exon 1 of 2	3

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.0000127

AC:

AN:

157386

Hom.:

AF XY:

0.0000115

AC XY:

AN XY:

86794

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000153

Gnomad OTH exome

AF:

0.000225

GnomAD4 exome

AF:

0.00000637

AC:

AN:

1413808

Hom.:

Cov.:

AF XY:

0.00000714

AC XY:

AN XY:

700690

show subpopulations

Gnomad4 AFR exome

AF:

0.0000303

Gnomad4 AMR exome

AF:

0.0000256

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:

0.00000274

Gnomad4 OTH exome

AF:

0.0000509

GnomAD4 genome

Cov.:

Bravo

AF:

0.00000756

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Left-right axis malformations

Benign:1

Oct 30, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.69

CADD

Benign

0.46

DANN

Benign

0.77

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over