11-20601496-TT-CA

Variant names:

• chr11-20601496-TT-CA
• NM_004211.5:c.371_372delTTinsCA
• SLC6A5 p.Phe124Ser

Variant summary

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

The NM_004211.5(SLC6A5):​c.371_372delTTinsCA​(p.Phe124Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. It is difficult to determine the true allele frequency of this variant because it is of type MNV, 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. Another nucleotide change resulting in the same amino acid substitution has been previously reported as Benign in ClinVar.

• Frequency: Genomes: not found (cov: 34)
• Consequence: SLC6A5 NM_004211.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 3.06
• Publications: 0 publications found

Genes affected

SLC6A5 (HGNC:11051): (solute carrier family 6 member 5) This gene encodes a sodium- and chloride-dependent glycine neurotransmitter transporter. This integral membrane glycoprotein is responsible for the clearance of extracellular glycine during glycine-mediated neurotransmission. This protein is found in glycinergic axons and maintains a high presynaptic pool of neurotransmitter at glycinergic synapses. Mutations in this gene cause hyperekplexia; a heterogenous neurological disorder characterized by exaggerated startle responses and neonatal apnea. Two transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jan 2016]

SLC6A5 Gene-Disease associations (from GenCC):

• hyperekplexia 3

  Inheritance: AR, AD Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, G2P, PanelApp Australia
• hereditary hyperekplexia

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

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

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_004211.5. 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
	SLC6A5	NM_004211.5	MANE Select	c.371_372delTTinsCA	p.Phe124Ser	missense	N/A	NP_004202.4	Q9Y345-1
	SLC6A5	NM_001318369.2		c.-193_-192delTTinsCA		5_prime_UTR	Exon 2 of 15	NP_001305298.1	Q9Y345-2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SLC6A5	ENST00000525748.6	TSL:1 MANE Select	c.371_372delTTinsCA	p.Phe124Ser	missense	N/A	ENSP00000434364.2	Q9Y345-1
	SLC6A5	ENST00000298923.11	TSL:1	n.371_372delTTinsCA		non_coding_transcript_exon	Exon 2 of 15	ENSP00000298923.7	J3KNC4

Frequencies

GnomAD3 genomes Cov.: 34

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

GnomAD4 genome Cov.: 34

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		3.1

Splicing

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

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Other links and lift over

hg19: chr11-20623042;