chr22-38740366-G-T

Variant names:

• chr22-38740366-G-T
• rs377483966
• NM_015374.3:c.1257C>A

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 2P and 5B. PM2 BP4_Strong BP7

The ENST00000689035.1(SUN2):​c.1257C>A​(p.Ala419Ala) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000253 in 1,578,046 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. A419A) has been classified as Likely benign.

• Frequency:
  • Genomes: 𝑓 0.000013 (0 hom., cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: SUN2 ENST00000689035.1 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -2.80
• Publications: 0 publications found

Genes affected

SUN2 (HGNC:14210): (Sad1 and UNC84 domain containing 2) SUN1 (MIM 607723) and SUN2 are inner nuclear membrane (INM) proteins that play a major role in nuclear-cytoplasmic connection by formation of a 'bridge' across the nuclear envelope, known as the LINC complex, via interaction with the conserved luminal KASH domain of nesprins (e.g., SYNE1; MIM 608441) located in the outer nuclear membrane (ONM). The LINC complex provides a direct connection between the nuclear lamina and the cytoskeleton, which contributes to nuclear positioning and cellular rigidity (summary by Haque et al., 2010 [PubMed 19933576]).[supplied by OMIM, Nov 2010]

GTPBP1 (HGNC:4669): (GTP binding protein 1) This gene is upregulated by interferon-gamma and encodes a protein that is a member of the AGP11/GTPBP1 family of GTP-binding proteins. A structurally similar protein has been found in mouse, where disruption of the gene for that protein had no observable phenotype. [provided by RefSeq, Jul 2008]

GTPBP1 Gene-Disease associations (from GenCC):

• neurodevelopmental disorder with characteristic facial and ectodermal features and tetraparesis 1

  Inheritance: AR Classification: MODERATE Submitted by: G2P

ENSG00000225450 (HGNC:):

ACMG classification

Our verdict: Likely_benign. The variant received -3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.77).
• BP7: Synonymous conserved (PhyloP=-2.8 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: ENST00000689035.1. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SUN2	NM_015374.3	MANE Select	c.1257C>A	p.Ala419Ala	synonymous	Exon 12 of 18	NP_056189.1
	SUN2	NM_001394427.1		c.1350C>A	p.Ala450Ala	synonymous	Exon 13 of 19	NP_001381356.1
	SUN2	NM_001199579.2		c.1320C>A	p.Ala440Ala	synonymous	Exon 12 of 18	NP_001186508.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SUN2	ENST00000689035.1	MANE Select	c.1257C>A	p.Ala419Ala	synonymous	Exon 12 of 18	ENSP00000508608.1
	SUN2	ENST00000405018.5	TSL:1	c.1320C>A	p.Ala440Ala	synonymous	Exon 12 of 18	ENSP00000385616.1
	SUN2	ENST00000405510.5	TSL:1	c.1257C>A	p.Ala419Ala	synonymous	Exon 13 of 19	ENSP00000385740.1

Frequencies

GnomAD3 genomes AF: 0.0000131 AC: 2 AN: 152140 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000294

Gnomad OTH AF: 0.00

GnomAD4 exome AF: 0.00000140 AC: 2 AN: 1425906 Hom.: 0 Cov.: 31 AF XY: 0.00000142 AC XY: 1 AN XY: 706064

African (AFR) AF: 0.00 AC: 0 AN: 32854

American (AMR) AF: 0.00 AC: 0 AN: 39706

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25388

East Asian (EAS) AF: 0.00 AC: 0 AN: 38064

South Asian (SAS) AF: 0.00 AC: 0 AN: 81718

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 49736

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5608

European-Non Finnish (NFE) AF: 0.00000183 AC: 2 AN: 1093898

Other (OTH) AF: 0.00 AC: 0 AN: 58934

GnomAD4 genome AF: 0.0000131 AC: 2 AN: 152140 Hom.: 0 Cov.: 32 AF XY: 0.0000135 AC XY: 1 AN XY: 74330

African (AFR) AF: 0.00 AC: 0 AN: 41434

American (AMR) AF: 0.00 AC: 0 AN: 15280

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3468

East Asian (EAS) AF: 0.00 AC: 0 AN: 5188

South Asian (SAS) AF: 0.00 AC: 0 AN: 4824

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10624

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 316

European-Non Finnish (NFE) AF: 0.0000294 AC: 2 AN: 68004

Other (OTH) AF: 0.00 AC: 0 AN: 2090

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000756

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.77
CADD	Benign	1.3
DANN	Benign	0.83
PhyloP100		-2.8
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7

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

Other links and lift over

dbSNP: rs377483966; hg19: chr22-39136371;