rs58272364

Variant names:

• chr18-31594143-CAA-C
• rs58272364
• NM_000371.4:c.201-967_201-966delAA

Your query was ambiguous. Multiple possible variants found:

• chr18-31594143-CAA-C
• chr18-31594143-CAA-CA
• chr18-31594143-CAA-CAAA
• chr18-31594143-CAA-CAAAA

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_000371.4(TTR):​c.201-967_201-966delAA variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000084 in 119,066 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: 𝑓 0.0000084 (0 hom., cov: 32)
• Consequence: TTR NM_000371.4 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.396
• Publications: 1 publications found

Genes affected

TTR (HGNC:12405): (transthyretin) This gene encodes one of the three prealbumins, which include alpha-1-antitrypsin, transthyretin and orosomucoid. The encoded protein, transthyretin, is a homo-tetrameric carrier protein, which transports thyroid hormones in the plasma and cerebrospinal fluid. It is also involved in the transport of retinol (vitamin A) in the plasma by associating with retinol-binding protein. The protein may also be involved in other intracellular processes including proteolysis, nerve regeneration, autophagy and glucose homeostasis. Mutations in this gene are associated with amyloid deposition, predominantly affecting peripheral nerves or the heart, while a small percentage of the gene mutations are non-amyloidogenic. The mutations are implicated in the etiology of several diseases, including amyloidotic polyneuropathy, euthyroid hyperthyroxinaemia, amyloidotic vitreous opacities, cardiomyopathy, oculoleptomeningeal amyloidosis, meningocerebrovascular amyloidosis and carpal tunnel syndrome. [provided by RefSeq, Aug 2017]

TTR Gene-Disease associations (from GenCC):

• amyloidosis, hereditary systemic 1

  Inheritance: AD Classification: DEFINITIVE Submitted by: G2P
• familial amyloid neuropathy

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, Ambry Genetics, Labcorp Genetics (formerly Invitae)
• hereditary ATTR amyloidosis

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• heart conduction disease

  Inheritance: AD Classification: STRONG Submitted by: Genomics England PanelApp
• ATTRV122I amyloidosis

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000371.4. 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
	TTR	NM_000371.4	MANE Select	c.201-967_201-966delAA		intron	N/A	NP_000362.1	P02766

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TTR	ENST00000237014.8	TSL:1 MANE Select	c.201-976_201-975delAA		intron	N/A	ENSP00000237014.4	P02766
	TTR	ENST00000649620.1		c.201-976_201-975delAA		intron	N/A	ENSP00000497927.1	P02766
	TTR	ENST00000858988.1		c.201-976_201-975delAA		intron	N/A	ENSP00000529047.1

Frequencies

GnomAD3 genomes AF: 0.00000840 AC: 1 AN: 119066 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000315

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: 0.00

Gnomad OTH AF: 0.00

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome AF: 0.00000840 AC: 1 AN: 119066 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 57448

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.0000315 AC: 1 AN: 31760

American (AMR) AF: 0.00 AC: 0 AN: 11932

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 2928

East Asian (EAS) AF: 0.00 AC: 0 AN: 4352

South Asian (SAS) AF: 0.00 AC: 0 AN: 3852

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 6736

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 256

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 54950

Other (OTH) AF: 0.00 AC: 0 AN: 1620

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5. (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		-0.40

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: rs58272364; hg19: chr18-29174106;