9-69037284-AAAGAAGAAGAAGAAG-AAAGAAGAAGAAGAAGAAGAAGAAGAAGAAGAAGAAGAAGAAGAAGAAG

Variant names:

• chr9-69037284-A-AAAGAAGAAGAAGAAGAAGAAGAAGAAGAAGAAG
• rs193922938
• NM_000144.5:c.165+1357_165+1358insGAAGAAGAAGAAGAAGAAGAAGAAGAAGAAGAA

Variant summary

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

The NM_000144.5(FXN):​c.165+1357_165+1358insGAAGAAGAAGAAGAAGAAGAAGAAGAAGAAGAA variant causes a intron change involving the alteration of a non-conserved nucleotide. It is difficult to determine the true allele frequency of this variant because it is of type INS_BIG, and the frequency of such variant types in population databases may be underestimated and unreliable. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: 𝑓 0.00023 (0 hom., cov: 0)
• Consequence: FXN NM_000144.5 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.327
• Publications: 0 publications found

Genes affected

FXN (HGNC:3951): (frataxin) This nuclear gene encodes a mitochondrial protein which belongs to the FRATAXIN family. The protein functions in regulating mitochondrial iron transport and respiration. The expansion of intronic trinucleotide repeat GAA from 8-33 repeats to >90 repeats results in Friedreich ataxia. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jul 2016]

FXN Gene-Disease associations (from GenCC):

• Friedreich ataxia

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• Friedreich ataxia 1

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae)
• Friedreich ataxia

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ENSG00000285130 (HGNC:):

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
FXN	NM_000144.5	c.165+1357_165+1358insGAAGAAGAAGAAGAAGAAGAAGAAGAAGAAGAA		intron_variant	Intron 1 of 4	ENST00000484259.3	NP_000135.2
FXN	NM_181425.3	c.165+1357_165+1358insGAAGAAGAAGAAGAAGAAGAAGAAGAAGAAGAA		intron_variant	Intron 1 of 4		NP_852090.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
FXN	ENST00000484259.3	c.165+1337_165+1338insAAGAAGAAGAAGAAGAAGAAGAAGAAGAAGAAG		intron_variant	Intron 1 of 4	3	NM_000144.5	ENSP00000419243.2
ENSG00000285130	ENST00000642889.1	c.165+1337_165+1338insAAGAAGAAGAAGAAGAAGAAGAAGAAGAAGAAG		intron_variant	Intron 1 of 24			ENSP00000493780.1

Frequencies

GnomAD3 genomes AF: 0.000231 AC: 18 AN: 78046 Hom.: 0 Cov.: 0

Gnomad AFR AF: 0.000237

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.000459

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000896

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000253

Gnomad OTH AF: 0.00

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

GnomAD4 genome AF: 0.000231 AC: 18 AN: 78038 Hom.: 0 Cov.: 0 AF XY: 0.000143 AC XY: 5 AN XY: 34940

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

African (AFR) AF: 0.000236 AC: 5 AN: 21152

American (AMR) AF: 0.00 AC: 0 AN: 6792

Ashkenazi Jewish (ASJ) AF: 0.000459 AC: 1 AN: 2180

East Asian (EAS) AF: 0.00 AC: 0 AN: 3222

South Asian (SAS) AF: 0.000903 AC: 2 AN: 2214

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 1330

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 142

European-Non Finnish (NFE) AF: 0.000253 AC: 10 AN: 39494

Other (OTH) AF: 0.00 AC: 0 AN: 962

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5. (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
PhyloP100		0.33

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs193922938; hg19: chr9-71652200;