9-127695053-TTGATGATGATGATGATGATGATGATGATGA-TTGATGATGATGATGA

Variant names:

• chr9-127695053-TTGATGATGATGATGA-T
• rs57076743
• ENST00000335223.5:c.279_293delTCATCATCATCATCA

Variant summary

Our verdict is Benign. The variant received -9 ACMG points: 0P and 9B. BP3 BS1 BS2

The ENST00000335223.5(PTRH1):​c.279_293delTCATCATCATCATCA​(p.His93_His97del) variant causes a disruptive inframe deletion change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00197 in 671,816 control chromosomes in the GnomAD database, including 9 homozygotes. It is difficult to determine the true allele frequency of this variant because it is of type DEL_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 0.0057 (8 hom., cov: 0)
  • Exomes 𝑓: 0.00093 (1 hom.)
• Consequence: PTRH1 ENST00000335223.5 disruptive_inframe_deletion
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.09
• Publications: 0 publications found

Genes affected

PTRH1 (HGNC:27039): (peptidyl-tRNA hydrolase 1 homolog) Enables RNA binding activity. [provided by Alliance of Genome Resources, Apr 2022]

STXBP1 (HGNC:11444): (syntaxin binding protein 1) This gene encodes a syntaxin-binding protein. The encoded protein appears to play a role in release of neurotransmitters via regulation of syntaxin, a transmembrane attachment protein receptor. Mutations in this gene have been associated with infantile epileptic encephalopathy-4. Alternatively spliced transcript variants have been described. [provided by RefSeq, Feb 2010]

STXBP1 Gene-Disease associations (from GenCC):

• developmental and epileptic encephalopathy, 4

  Inheritance: AD, AR Classification: DEFINITIVE, STRONG Submitted by: G2P, Ambry Genetics, PanelApp Australia, Labcorp Genetics (formerly Invitae)
• genetic developmental and epileptic encephalopathy

  Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: ClinGen, Orphanet
• atypical Rett syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• autosomal dominant non-syndromic intellectual disability

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• Dravet syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• infantile spasms

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• undetermined early-onset epileptic encephalopathy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• autism spectrum disorder

  Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics
• intellectual disability

  Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics

ACMG classification

Our verdict: Benign. The variant received -9 ACMG points.

• BP3: Nonframeshift variant in repetitive region in ENST00000335223.5
• BS1: Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.00567 (837/147718) while in subpopulation AFR AF = 0.0189 (756/39974). AF 95% confidence interval is 0.0178. There are 8 homozygotes in GnomAd4. There are 395 alleles in the male GnomAd4 subpopulation. Median coverage is 0. This position passed quality control check.
• BS2: High Homozygotes in GnomAd4 at 8 AR gene

Variant Effect in Transcripts

ACMG analysis was done for transcript: ENST00000335223.5. 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
	STXBP1	NM_001374314.1		c.*64_*78delATGATGATGATGATG		3_prime_UTR	Exon 19 of 19	NP_001361243.1	A0A1B0GWF2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PTRH1	ENST00000335223.5	TSL:1	c.279_293delTCATCATCATCATCA	p.His93_His97del	disruptive_inframe_deletion	Exon 2 of 3	ENSP00000493136.1	A0A286YF52
	STXBP1	ENST00000636962.2	TSL:5	c.*64_*78delATGATGATGATGATG		3_prime_UTR	Exon 19 of 19	ENSP00000489762.1	A0A1B0GWF2
	STXBP1	ENST00000635950.2	TSL:5	n.*64_*78delATGATGATGATGATG		non_coding_transcript_exon	Exon 19 of 20	ENSP00000490903.1	A0A1B0GWF2

Frequencies

GnomAD3 genomes AF: 0.00562 AC: 829 AN: 147598 Hom.: 8 Cov.: 0

Gnomad AFR AF: 0.0188

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00429

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: 0.000105

Gnomad OTH AF: 0.00497

GnomAD4 exome AF: 0.000925 AC: 485 AN: 524098 Hom.: 1 AF XY: 0.000769 AC XY: 218 AN XY: 283540

African (AFR) AF: 0.0213 AC: 319 AN: 14968

American (AMR) AF: 0.00192 AC: 63 AN: 32760

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 18876

East Asian (EAS) AF: 0.00 AC: 0 AN: 31682

South Asian (SAS) AF: 0.000118 AC: 7 AN: 59136

European-Finnish (FIN) AF: 0.0000318 AC: 1 AN: 31424

Middle Eastern (MID) AF: 0.000257 AC: 1 AN: 3896

European-Non Finnish (NFE) AF: 0.0000860 AC: 26 AN: 302182

Other (OTH) AF: 0.00233 AC: 68 AN: 29174

GnomAD4 genome AF: 0.00567 AC: 837 AN: 147718 Hom.: 8 Cov.: 0 AF XY: 0.00550 AC XY: 395 AN XY: 71782

African (AFR) AF: 0.0189 AC: 756 AN: 39974

American (AMR) AF: 0.00428 AC: 63 AN: 14718

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3446

East Asian (EAS) AF: 0.00 AC: 0 AN: 4980

South Asian (SAS) AF: 0.000222 AC: 1 AN: 4510

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 9922

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 288

European-Non Finnish (NFE) AF: 0.000105 AC: 7 AN: 66942

Other (OTH) AF: 0.00491 AC: 10 AN: 2038

Alfa AF: 0.00 Hom.: 1157

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		1.1

Splicing

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

Other links and lift over

dbSNP: rs57076743; hg19: chr9-130457332;