19-40394272-TTCCTCCTCCTCC-TTCCTCCTCCTCCTCCTCC

Variant names:

• chr19-40394272-T-TTCCTCC
• rs139624657
• NM_181882.3:c.4074_4079dupGGAGGA

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 0P and 2B. BP3 BP6

The NM_181882.3(PRX):​c.4074_4079dupGGAGGA​(p.Glu1359_Glu1360dup) variant causes a disruptive inframe insertion change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000436 in 1,605,030 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: 𝑓 0.0000066 (0 hom., cov: 32)
  • Exomes 𝑓: 0.0000041 (0 hom.)
• Consequence: PRX NM_181882.3 disruptive_inframe_insertion
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1 B:1
• Conservation: PhyloP100: 1.16
• Publications: 6 publications found

Genes affected

PRX (HGNC:13797): (periaxin) This gene encodes a protein involved in peripheral nerve myelin upkeep. The encoded protein contains 2 PDZ domains which were named after PSD95 (post synaptic density protein), DlgA (Drosophila disc large tumor suppressor), and ZO1 (a mammalian tight junction protein). Two alternatively spliced transcript variants have been described for this gene which encode different protein isoforms and which are targeted differently in the Schwann cell. Mutations in this gene cause Charcot-Marie-Tooth neuoropathy, type 4F and Dejerine-Sottas neuropathy. [provided by RefSeq, Jul 2008]

PRX Gene-Disease associations (from GenCC):

• Charcot-Marie-Tooth disease type 4

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• Charcot-Marie-Tooth disease type 4F

  Inheritance: AR Classification: STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, Orphanet
• Charcot-Marie-Tooth disease type 3

  Inheritance: AD, AR Classification: MODERATE, SUPPORTIVE Submitted by: Orphanet, Ambry Genetics

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• BP3: Nonframeshift variant in repetitive region in NM_181882.3
• BP6: Variant 19-40394272-T-TTCCTCC is Benign according to our data. Variant chr19-40394272-T-TTCCTCC is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 1052678.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_181882.3. 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
	PRX	NM_181882.3	MANE Select	c.4074_4079dupGGAGGA	p.Glu1359_Glu1360dup	disruptive_inframe_insertion	Exon 7 of 7	NP_870998.2	Q9BXM0-1
	PRX	NM_001411127.1		c.4359_4364dupGGAGGA	p.Glu1454_Glu1455dup	disruptive_inframe_insertion	Exon 7 of 7	NP_001398056.1	A0A669KBF1
	PRX	NM_020956.2		c.*4279_*4284dupGGAGGA		3_prime_UTR	Exon 6 of 6	NP_066007.1	Q9BXM0-2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PRX	ENST00000324001.8	TSL:1 MANE Select	c.4074_4079dupGGAGGA	p.Glu1359_Glu1360dup	disruptive_inframe_insertion	Exon 7 of 7	ENSP00000326018.6	Q9BXM0-1
	PRX	ENST00000291825.11	TSL:1	c.*4279_*4284dupGGAGGA		3_prime_UTR	Exon 6 of 6	ENSP00000291825.6	Q9BXM0-2
	PRX	ENST00000674005.2		c.4359_4364dupGGAGGA	p.Glu1454_Glu1455dup	disruptive_inframe_insertion	Exon 7 of 7	ENSP00000501261.1	A0A669KBF1

Frequencies

GnomAD3 genomes AF: 0.00000661 AC: 1 AN: 151214 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000243

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

GnomAD2 exomes AF: 0.0000137 AC: 2 AN: 145830 AF XY: 0.0000128

Gnomad AFR exome AF: 0.000102

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.000104

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000413 AC: 6 AN: 1453816 Hom.: 0 Cov.: 29 AF XY: 0.00000415 AC XY: 3 AN XY: 722810

African (AFR) AF: 0.0000300 AC: 1 AN: 33292

American (AMR) AF: 0.00 AC: 0 AN: 43920

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25898

East Asian (EAS) AF: 0.0000253 AC: 1 AN: 39464

South Asian (SAS) AF: 0.0000235 AC: 2 AN: 85280

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 52972

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5736

European-Non Finnish (NFE) AF: 9.03e-7 AC: 1 AN: 1107252

Other (OTH) AF: 0.0000167 AC: 1 AN: 60002

GnomAD4 genome AF: 0.00000661 AC: 1 AN: 151214 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 73800

African (AFR) AF: 0.0000243 AC: 1 AN: 41218

American (AMR) AF: 0.00 AC: 0 AN: 15220

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3464

East Asian (EAS) AF: 0.00 AC: 0 AN: 5134

South Asian (SAS) AF: 0.00 AC: 0 AN: 4812

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10346

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

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 67716

Other (OTH) AF: 0.00 AC: 0 AN: 2078

Alfa AF: 0.00 Hom.: 0

ClinVar

ClinVar submissions

Significance: Conflicting classifications of pathogenicity

Revision: criteria provided, conflicting classifications

Pathogenic	VUS	Benign	Condition
-	1	-	Charcot-Marie-Tooth disease type 4 (1)
-	-	1	Inborn genetic diseases (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		1.2
Mutation Taster		=84/16	polymorphism

Splicing

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

Other links and lift over

dbSNP: rs139624657; hg19: chr19-40900179;